Cleanup listing for WikiProject Animal anatomy as of December 16, 2025.
Of the 1317 articles in this project 555 or 42% are marked for cleanup, with 1012 issues in total.
Listings: Alphabetic • By category • CSV • History
... represents the current issue name. Issue names are abbreviated category names.
| Article | Importance | Class | Issues |
|---|
| Article | Importance | Class | Issues |
|---|
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Acromion | Low | Start | 2 | January 2016 | ... (January 2016), Factual verification needed (November 2025) |
| Air sac | Mid | C | 2 | September 2022 | ... (September 2022, July 2024) |
| Alae (nematode anatomy) | Mid | Start | 2 | August 2014 | ... (August 2014), Weasel-worded phrases (August 2014) |
| Anal gland | Mid | Start | 2 | July 2023 | ... (July 2023), CS1 errors: ISBN date |
| Arthropod mouthparts | Mid | Start | 2 | December 2013 | Unsourced passages need footnotes {{More citations needed}} (December 2013), ... (July 2025) |
| Auditory system | High | C | 2 | April 2016 | ... (April 2016), Unsourced passages need footnotes {{citation needed}} (June 2022) |
| Baculum | Mid | Start | 3 | March 2020 | ... (March 2020), Cites unreliable sources (April 2020), CS1 errors: ISBN date |
| Baleen | Low | Start | 3 | September 2022 | ... (September 2022), Unsourced passages need footnotes {{More citations needed}} (April 2025), Unsourced passages need footnotes {{citation needed}} (November 2025) |
| Bedburg-Königshoven (Mesolithic antler frontlets) | Low | Start | 2 | September 2023 | Unsourced passages need footnotes {{citation needed}} (September 2023), ... (October 2025) |
| Bird anatomy | High | B | 3 | September 2018 | Unsourced passages need footnotes {{More citations needed}} (September 2018), ... (April 2021), CS1 errors: ISBN date |
| Chameleon vision | Mid | C | 2 | May 2025 | ... (May 2025), Failed verification (May 2025) |
| Coelom | High | C | 5 | February 2015 | Unsourced passages need footnotes {{citation needed}} (February 2015, November 2018, March 2021), ... (June 2018, March 2021) |
| Coral | Mid | GA | 4 | January 2018 | Dead external links {{dead link}} (January 2018), ... (August 2021, September 2021), External link cleanup {{external links}} (August 2023) |
| Eardrum | Mid | C | 2 | July 2018 | Unsourced passages need footnotes {{citation needed}} (July 2018), ... (July 2018) |
| Egg cell | High | Start | 2 | October 2014 | Unsourced passages need footnotes {{citation needed}} (October 2014), ... (May 2021) |
| Evolution of the eye | High | C | 3 | December 2008 | ... (December 2008, March 2017), Unsourced passages need footnotes {{More citations needed}} (October 2016) |
| Exoskeleton | High | C | 4 | September 2020 | Unsourced passages need footnotes {{citation needed}} (September 2020, May 2023), ... (September 2020), CS1 errors: periodical ignored |
| Fish anatomy | High | B | 5 | August 2020 | Detailed references needed, ... (August 2020), Unsourced passages need footnotes {{citation needed}} (August 2020), Factual verification needed (August 2020), Pages with broken anchors (see article talk page, remove when fixed) |
| Gill | Mid | C | 3 | March 2025 | CS1 errors: missing title, ... (March 2025), CS1 errors: ISBN date |
| Horn (anatomy) | Mid | C | 2 | December 2007 | Unsourced passages need footnotes {{citation needed}} (December 2007), ... (March 2021) |
| Hyoid bone | Mid | C | 5 | January 2014 | Unsourced passages need footnotes {{citation needed}} (January 2014, April 2022), ... (February 2022, September 2023), Pages with broken anchors (see article talk page, remove when fixed) |
| Intermaxillary segment | Mid | Stub | 1 | February 2009 | ... (February 2009) |
| Morphology of Diptera | Mid | C | 4 | January 2014 | Original research (January 2014), Has general references but lacks inline footnotes (January 2014), ... (August 2020), Unsourced passages need footnotes {{More citations needed}} (August 2020) |
| Myomere | Mid | Stub | 6 | April 2025 | Cites unreliable sources (April 2025), Unsourced passages need footnotes {{More citations needed}} (April 2025), Unsourced passages need footnotes {{citation needed}} (April 2025), Page number citations needed (April 2025), Style editing needed (April 2025), ... (June 2025) |
| Ossicles | Mid | C | 2 | November 2017 | ... (November 2017), Unsourced passages need footnotes {{More citations needed}} (December 2024) |
| Parietal eye | Low | Start | 2 | June 2022 | ... (June 2022), Pages with broken anchors (see article talk page, remove when fixed) |
| Pig bladder | Low | Stub | 1 | May 2023 | ... (May 2023) |
| Pouch (marsupial) | Low | Start | 4 | May 2015 | Unsourced passages need footnotes {{More citations needed}} (May 2015, March 2024), Original research (March 2024), ... (November 2025) |
| Radula | Mid | C | 4 | September 2008 | Factual verification needed (March 2009), Expansion needed (September 2008), ... (April 2011), Dead external links {{dead link}} (July 2025) |
| Reniculate kidney | Low | Start | 1 | February 2014 | ... (February 2014) |
| Reticular formation | Mid | C | 10 | November 2009 | Unsourced passages need footnotes {{citation needed}} (November 2009, February 2012, March 2017, September 2017, September 2021, May 2024, August 2024), ... (September 2019), Unsourced passages need footnotes {{More citations needed}} (October 2019), CS1 errors: periodical ignored |
| Scale (zoology) | Mid | C | 1 | January 2010 | ... (January 2010) |
| Sensory nervous system | Top | C | 5 | May 2019 | ... (May 2019), Off-topic sections (May 2019), Pages with broken anchors (see article talk page, remove when fixed), Unsourced passages need footnotes {{citation needed}} (November 2024), Page number citations needed (November 2024) |
| Sexual dimorphism | High | B | 8 | October 2016 | Disputed statements (October 2016), ... (July 2018), Unsourced passages need footnotes {{citation needed}} (August 2018, August 2021, November 2021, May 2022), Page number citations needed (August 2021), Cites unreliable sources (August 2021) |
| Sexual dimorphism measures | Low | C | 4 | August 2021 | Unsourced passages need footnotes {{More citations needed}} (August 2021), Has general references but lacks inline footnotes (August 2021), Style editing needed (July 2025), ... (November 2025) |
| Simple eye in invertebrates | Mid | C | 1 | April 2024 | ... (April 2024) |
| Somatosensory system | Mid | C | 4 | February 2019 | Unsourced passages need footnotes {{citation needed}} (February 2019), Too technical (May 2021), ... (June 2023), Unsourced passages need footnotes {{More citations needed}} (August 2023) |
| Swim bladder | Mid | C | 1 | May 2014 | ... (May 2014) |
| Telson | Low | Start | 1 | August 2014 | ... (August 2014) |
| Tendon | High | C | 2 | May 2023 | ... (May 2023), Unsourced passages need footnotes {{citation needed}} (September 2025) |
| Visual system | High | C | 2 | September 2024 | ... (September 2024), Unsourced passages need footnotes {{citation needed}} (November 2025) |
| Vocal sac | Low | Start | 2 | October 2007 | ... (October 2007), Unsourced passages need footnotes {{More citations needed}} (October 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Buccal cirri | Low | Start | 2 | January 2017 | ... (January 2017), Notability unclear (January 2017) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Human sex pheromones | Low | Start | 4 | November 2017 | ... (March 2023), Cites unreliable sources (November 2017), Wikipedia neutral point of view disputes (March 2023) |
| Nuptial tubercles | Low | Start | 2 | February 2025 | ... (February 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Allometry | Mid | C | 2 | September 2021 | Dead external links {{dead link}} (September 2021), ... (August 2022) |
| Amniotic sac | Mid | C | 3 | October 2020 | Unsourced passages need footnotes {{citation needed}} (October 2020, July 2021), ... (September 2025) |
| Cartilage | High | C | 1 | April 2025 | ... (April 2025) |
| Nerve | High | C | 2 | September 2022 | Incomplete citations (September 2022), ... (April 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Fang | High | Start | 1 | June 2025 | ... (June 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Early stages of embryogenesis of tailless amphibians | Low | C | 4 | February 2014 | ... (February 2014), Style editing needed (February 2014), Unsourced passages need footnotes {{More citations needed}} (February 2014), Orphaned (June 2024) |
| Notochord | High | C | 3 | January 2011 | Unsourced passages need footnotes {{citation needed}} (January 2011), ... (February 2017), Cites unreliable sources (September 2022) |
| Otolith | Mid | B | 3 | February 2016 | Unsourced passages need footnotes {{citation needed}} (February 2016), ... (March 2021), Dead external links {{dead link}} (May 2025) |
| Phalanx bone | Mid | C | 5 | January 2014 | Expansion needed (January 2014), ... (January 2014), Harv and Sfn no-target errors, Unsourced passages need footnotes {{citation needed}} (November 2021), CS1 errors: ISBN date |
| Somatosensory system | Mid | C | 4 | February 2019 | Unsourced passages need footnotes {{citation needed}} (February 2019), ... (May 2021), Clarification needed (June 2023), Unsourced passages need footnotes {{More citations needed}} (August 2023) |
| Spinal cord | High | C | 6 | December 2016 | Unsourced passages need footnotes {{citation needed}} (December 2016, December 2024), CS1 errors: periodical ignored, Unsourced passages need footnotes {{More citations needed}} (January 2024), Page number citations needed (September 2024), ... (January 2025) |
| Whiskers | Mid | C | 3 | April 2021 | ... (April 2021), Incomplete citations (March 2022), Unsourced passages need footnotes {{citation needed}} (March 2024) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Liver | Mid | B | 3 | August 2018 | Potentially dated statements (2018), ... (August 2018), Dead external links {{dead link}} (August 2023) |
| Muscular hydrostat | Mid | C | 1 | April 2024 | ... (April 2024) |
| Tongue | Mid | B | 4 | October 2022 | Page number citations needed (October 2022), Unsourced passages need footnotes {{More citations needed}} (October 2022), ... (April 2024), CS1 errors: ISBN date |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Arthropod leg | Mid | C | 7 | December 2017 | Unsourced passages need footnotes {{citation needed}} (December 2017, February 2025, March 2025), Unsourced passages need footnotes {{More citations needed}} (March 2025), ... (May 2025, May 2025), Expansion needed (May 2025) |
| Deutoplasm | Mid | Start | 2 | November 2024 | ... (November 2024, November 2024) |
| Equine conformation | Low | Start | 4 | November 2010 | Unsourced passages need footnotes {{More citations needed}} (November 2010), Unsourced passages need footnotes {{citation needed}} (November 2020), ... (January 2024, January 2024) |
| Gonad | High | Start | 5 | May 2012 | ... (May 2012, May 2012), Expansion needed (September 2022), Unsourced passages need footnotes {{citation needed}} (September 2022, April 2025) |
| Love dart | Mid | B | 5 | October 2008 | Unsourced passages need footnotes {{citation needed}} (October 2008), Accuracy disputes or self-published (July 2013), Unsourced passages need footnotes {{More citations needed}} (March 2023), Weasel-worded phrases (January 2025), ... (October 2025) |
| Prehensility | Low | Start | 3 | December 2009 | Unsourced passages need footnotes {{More citations needed}} (December 2009), ... (October 2018), Prose needed (October 2018) |
| Scallop | Mid | B | 12 | January 2017 | Unsourced passages need footnotes {{citation needed}} (January 2017, March 2018, July 2024), Page number citations needed (January 2017), Cites unreliable sources (January 2017, April 2018, October 2020), CS1 errors: periodical ignored, CS1 errors: ISBN date, ... (July 2025, July 2025), Unsourced passages need footnotes {{More citations needed}} (July 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Arthropod leg | Mid | C | 7 | December 2017 | Unsourced passages need footnotes {{citation needed}} (December 2017, February 2025, March 2025), Unsourced passages need footnotes {{More citations needed}} (March 2025), Cleanup needed (May 2025, May 2025), ... (May 2025) |
| Avian brain | Mid | Start | 1 | October 2023 | ... (October 2023) |
| Canine terminology | Mid | Start | 1 | January 2011 | ... (January 2011) |
| Cephalopod ink | High | C | 1 | July 2018 | ... (July 2018) |
| Circulatory system | High | C | 4 | March 2015 | ... (March 2015), Dead external links {{dead link}} (August 2021), Unsourced passages need footnotes {{citation needed}} (February 2022, January 2025) |
| Cranial kinesis | Mid | Start | 2 | October 2010 | ... (October 2010), Dead external links {{dead link}} (August 2017) |
| Cuneiform bones | Low | Start | 1 | April 2015 | ... (April 2015) |
| Digestion | High | C | 4 | May 2011 | Detailed references needed, Unsourced passages need footnotes {{citation needed}} (May 2011), ... (August 2011), Unsourced passages need footnotes {{More citations needed}} (July 2022) |
| Excretory system | Top | C | 4 | April 2015 | Unsourced passages need footnotes {{More citations needed}} (April 2015), Unsourced passages need footnotes {{citation needed}} (May 2015, April 2024), ... (November 2017) |
| Funnel–mantle locking apparatus | Mid | Start | 1 | June 2022 | ... (June 2022) |
| Gladius (cephalopod) | High | Start | 1 | April 2025 | ... (April 2025) |
| Gland | High | Start | 2 | April 2014 | ... (April 2014), Unsourced passages need footnotes {{More citations needed}} (April 2024) |
| Gonad | High | Start | 5 | May 2012 | Cleanup needed (May 2012, May 2012), ... (September 2022), Unsourced passages need footnotes {{citation needed}} (September 2022, April 2025) |
| Largest body part | Mid | List | 1 | September 2011 | ... (September 2011) |
| Mollusc eye | Mid | Stub | 1 | March 2025 | ... (March 2025) |
| Morphometrics | High | B | 2 | June 2008 | ... (June 2008), Dead external links {{dead link}} (February 2018) |
| Muscular system | Top | C | 1 | November 2017 | ... (November 2017) |
| Nasal cavity | Low | C | 1 | February 2011 | ... (February 2011) |
| Olfactory receptor neuron | Low | C | 2 | February 2018 | ... (February 2018), CS1 errors: missing periodical |
| Organ (biology) | Top | C | 5 | May 2015 | Page number citations needed (May 2015), Unsourced passages need footnotes {{citation needed}} (February 2018, May 2021, August 2021), ... (February 2018) |
| Paralimbic cortex | Low | Start | 1 | December 2012 | ... (December 2012) |
| Phalanx bone | Mid | C | 5 | January 2014 | ... (January 2014), Too technical (January 2014), Harv and Sfn no-target errors, Unsourced passages need footnotes {{citation needed}} (November 2021), CS1 errors: ISBN date |
| Proboscis | High | Start | 1 | August 2023 | ... (August 2023) |
| Radula | Mid | C | 4 | September 2008 | Factual verification needed (March 2009), ... (September 2008), Clarification needed (April 2011), Dead external links {{dead link}} (July 2025) |
| Salivary gland | Mid | B | 2 | January 2018 | ... (January 2018, October 2020) |
| Sensory organs of gastropods | Mid | Start | 2 | December 2009 | ... (December 2009), Page number citations needed (May 2014) |
| Tubular gland | Low | Stub | 1 | February 2024 | ... (February 2024) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Glossary of mammalian dental topography | Low | List | 2 | February 2011 | ... (February 2011), CS1 errors: ISBN date |
| List of animals featuring external asymmetry | Low | List | 3 | April 2013 | ... (April 2013), Unsourced passages need footnotes {{citation needed}} (February 2021), Weasel-worded phrases (February 2021) |
| List of terms used in bird topography | Low | List | 1 | August 2008 | ... (August 2008) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Cat anatomy | High | C | 10 | August 2010 | Original research (August 2010, January 2025), ... (November 2018), Unsourced passages need footnotes {{More citations needed}} (August 2022), Unsourced passages need footnotes {{citation needed}} (March 2024), Dead external links {{dead link}} (January 2025), Factual verification needed (January 2025), Accuracy disputes or self-published (January 2025), Cites unreliable sources (January 2025), Page number citations needed (January 2025) |
| Eagle eye | Low | C | 1 | May 2021 | ... (May 2021) |
| Fur | High | C | 2 | July 2023 | Unsourced passages need footnotes {{citation needed}} (July 2023), ... (July 2025) |
| Horse hoof | Mid | B | 4 | July 2011 | Unsourced passages need footnotes {{More citations needed}} (July 2011), Unsourced passages need footnotes {{citation needed}} (January 2017, June 2024), ... (November 2022) |
| Merle (dog coat) | Low | Start | 2 | September 2011 | Unsourced passages need footnotes {{More citations needed}} (September 2011), ... (April 2012) |
| Sexual reproduction | High | C | 3 | December 2023 | Failed verification (December 2023), Unsourced passages need footnotes {{citation needed}} (August 2025), ... (August 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Buccal cirri | Low | Start | 2 | January 2017 | Context needed (January 2017), ... (January 2017) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Lymphatic system | Mid | B | 3 | September 2010 | Dead external links {{dead link}} (September 2010), ... (June 2019), Unsourced passages need footnotes {{More citations needed}} (December 2024) |
| Ootheca | Low | Stub | 1 | December 2025 | ... (December 2025) |
| Sensory nervous system | Top | C | 5 | May 2019 | Clarification needed (May 2019), ... (May 2019), Pages with broken anchors (see article talk page, remove when fixed), Unsourced passages need footnotes {{citation needed}} (November 2024), Page number citations needed (November 2024) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Biomineralization | High | B | 2 | December 2020 | ... (December 2020), Unsourced passages need footnotes {{citation needed}} (May 2023) |
| Conchology | Mid | C | 3 | July 2016 | Unsourced passages need footnotes {{More citations needed}} (July 2016), ... (2020), Dead external links {{dead link}} (July 2020) |
| Esophagus | Mid | GA | 4 | 2014 | ... (2014, 2021), CS1 errors: ISBN date, Unsourced passages need footnotes {{citation needed}} (October 2025) |
| Eye color | Low | C | 5 | 2006 | ... (2006, 2010), Unsourced passages need footnotes {{More citations needed}} (November 2012), Page number citations needed (May 2020), Unsourced passages need footnotes {{citation needed}} (February 2022) |
| Gallbladder | Mid | GA | 2 | 2010 | ... (2010), Dead external links {{dead link}} (July 2025) |
| Liver | Mid | B | 3 | August 2018 | ... (2018), Vague or ambiguous time (August 2018), Dead external links {{dead link}} (August 2023) |
| Mammalian reproduction | Mid | Start | 1 | December 2015 | ... (December 2015) |
| Mushroom bodies | Mid | Start | 1 | 2021 | ... (2021) |
| Olfactory bulb | Mid | C | 4 | December 2013 | ... (2013), Unsourced passages need footnotes {{citation needed}} (December 2013, March 2017, November 2020) |
| Pancreas | Mid | GA | 1 | 2018 | ... (2018) |
| Penis | High | C | 7 | June 2013 | Dead external links {{dead link}} (June 2013), Reorganization needed (June 2013), Unsourced passages need footnotes {{citation needed}} (December 2013), ... (2015), CS1 errors: missing periodical, Accuracy disputes or self-published (February 2020), CS1 errors: ISBN date |
| Rectum | Mid | C | 4 | June 2009 | Unsourced passages need footnotes {{citation needed}} (June 2009, July 2020), ... (2014), Unsourced passages need footnotes {{More citations needed}} (January 2022) |
| Stem cell | Mid | B | 4 | 2016 | ... (2016), Page number citations needed (January 2019, August 2021), Unsourced passages need footnotes {{citation needed}} (August 2021) |
| Tail (horse) | Low | C | 3 | July 2011 | Unsourced passages need footnotes {{More citations needed}} (July 2011), Reference errors, ... (2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Prehensility | Low | Start | 3 | December 2009 | Unsourced passages need footnotes {{More citations needed}} (December 2009), Cleanup needed (October 2018), ... (October 2018) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Nervous system of gastropods | Mid | Start | 1 | April 2017 | ... (April 2017) |
| Penis | High | C | 7 | June 2013 | Dead external links {{dead link}} (June 2013), ... (June 2013), Unsourced passages need footnotes {{citation needed}} (December 2013), Potentially dated statements (2015), CS1 errors: missing periodical, Accuracy disputes or self-published (February 2020), CS1 errors: ISBN date |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Basal retinal neuron | Low | Start | 2 | May 2025 | CS1 errors: periodical ignored, ... (May 2025) |
| Early stages of embryogenesis of tailless amphibians | Low | C | 4 | February 2014 | Too technical (February 2014), ... (February 2014), Unsourced passages need footnotes {{More citations needed}} (February 2014), Orphaned (June 2024) |
| Myomere | Mid | Stub | 6 | April 2025 | Cites unreliable sources (April 2025), Unsourced passages need footnotes {{More citations needed}} (April 2025), Unsourced passages need footnotes {{citation needed}} (April 2025), Page number citations needed (April 2025), ... (April 2025), Clarification needed (June 2025) |
| Sexual dimorphism measures | Low | C | 4 | August 2021 | Unsourced passages need footnotes {{More citations needed}} (August 2021), Has general references but lacks inline footnotes (August 2021), ... (July 2025), Clarification needed (November 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Arthropod head problem | Mid | B | 1 | June 2016 | ... (June 2016) |
| Syrinx (bird anatomy) | Low | Start | 1 | February 2022 | ... (February 2022) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Papilla (worms) | Low | Stub | 1 | December 2024 | ... (December 2024) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Allometry | Mid | C | 2 | September 2021 | ... (September 2021), Rewrite needed (August 2022) |
| Anterior lingual glands | Low | Start | 1 | September 2019 | ... (September 2019) |
| Beak | Mid | B | 5 | September 2021 | CS1 errors: missing periodical, Incomplete citations (September 2021), Accuracy disputes or self-published (May 2023), ... (October 2023), CS1 errors: ISBN date |
| Bladder | Mid | C | 2 | July 2020 | Unsourced passages need footnotes {{citation needed}} (July 2020), ... (February 2025) |
| Blastulation | Mid | Start | 1 | November 2018 | ... (November 2018) |
| Caruncle (bird anatomy) | Low | Start | 1 | November 2016 | ... (November 2016) |
| Cat anatomy | High | C | 10 | August 2010 | Original research (August 2010, January 2025), Introduction cleanup (November 2018), Unsourced passages need footnotes {{More citations needed}} (August 2022), Unsourced passages need footnotes {{citation needed}} (March 2024), ... (January 2025), Factual verification needed (January 2025), Accuracy disputes or self-published (January 2025), Cites unreliable sources (January 2025), Page number citations needed (January 2025) |
| Cephalopod limb | High | C | 1 | November 2016 | ... (November 2016) |
| Chromatophore | High | B | 3 | March 2016 | Unsourced passages need footnotes {{citation needed}} (March 2016, February 2019), ... (February 2019) |
| Circulatory system | High | C | 4 | March 2015 | Expansion needed (March 2015), ... (August 2021), Unsourced passages need footnotes {{citation needed}} (February 2022, January 2025) |
| Cirrus (biology) | Low | Start | 1 | December 2023 | ... (December 2023) |
| Coenosarc | Low | Stub | 1 | March 2025 | ... (March 2025) |
| Conchology | Mid | C | 3 | July 2016 | Unsourced passages need footnotes {{More citations needed}} (July 2016), Potentially dated statements (2020), ... (July 2020) |
| Coral | Mid | GA | 4 | January 2018 | ... (January 2018), Clarification needed (August 2021, September 2021), External link cleanup {{external links}} (August 2023) |
| Cranial kinesis | Mid | Start | 2 | October 2010 | Expansion needed (October 2010), ... (August 2017) |
| Dermis | Mid | C | 1 | January 2019 | ... (January 2019) |
| Digit (anatomy) | Mid | Start | 1 | July 2025 | ... (July 2025) |
| Dog anatomy | High | B | 4 | September 2010 | Page number citations needed (September 2010), Unsourced passages need footnotes {{More citations needed}} (June 2015), ... (August 2025), Unsourced passages need footnotes {{citation needed}} (August 2025) |
| Ecomorphology | Mid | B | 1 | May 2021 | ... (May 2021) |
| Ectotympanic | Low | Stub | 1 | August 2019 | ... (August 2019) |
| Eggshell | Mid | Start | 5 | March 2016 | ... (March 2016), Unsourced passages need footnotes {{citation needed}} (September 2017, July 2021), CS1 errors: missing title, CS1 errors: bare URL |
| External morphology of Lepidoptera | High | GA | 4 | December 2016 | ... (December 2016, December 2019), CS1 errors: periodical ignored, CS1 errors: ISBN date |
| Fecal shield | Low | C | 1 | August 2019 | ... (August 2019) |
| Fin | Mid | C | 2 | September 2017 | ... (September 2017, May 2025) |
| Fish scale | Mid | B | 2 | September 2025 | CS1 errors: generic name, ... (September 2025) |
| Gallbladder | Mid | GA | 2 | 2010 | Potentially dated statements (2010), ... (July 2025) |
| Gamete | High | Start | 1 | May 2024 | ... (May 2024) |
| Gastropod shell | Mid | C | 5 | December 2013 | Incomplete citations (December 2013), Page number citations needed (October 2020), Unsourced passages need footnotes {{citation needed}} (October 2020, May 2023), ... (May 2025) |
| Harderian gland | Low | Start | 1 | December 2022 | ... (December 2022) |
| Hieronymus Fabricius | Low | Start | 2 | December 2017 | ... (December 2017), Pages with broken anchors (see article talk page, remove when fixed) |
| Induced ovulation (animals) | Low | C | 1 | July 2022 | ... (July 2022) |
| Insect morphology | High | B | 4 | November 2017 | ... (November 2017), CS1 errors: missing periodical, CS1 errors: generic name, Unsourced passages need footnotes {{citation needed}} (December 2023) |
| Irregular bone | Low | Stub | 1 | January 2020 | ... (January 2020) |
| Laryngeal saccules | Low | Start | 1 | February 2020 | ... (February 2020) |
| List of animals by number of neurons | Low | List | 2 | June 2020 | ... (June 2020), Unsourced passages need footnotes {{citation needed}} (January 2024) |
| Liver | Mid | B | 3 | August 2018 | Potentially dated statements (2018), Vague or ambiguous time (August 2018), ... (August 2023) |
| Lymphatic system | Mid | B | 3 | September 2010 | ... (September 2010), Off-topic sections (June 2019), Unsourced passages need footnotes {{More citations needed}} (December 2024) |
| Mandible | Mid | C | 3 | March 2017 | Unsourced passages need footnotes {{citation needed}} (March 2017, January 2024), ... (March 2020) |
| Mesoderm | Mid | C | 3 | June 2011 | Cites unreliable sources (June 2011), ... (January 2018), Unsourced passages need footnotes {{More citations needed}} (May 2022) |
| Microvillus | Low | C | 2 | November 2016 | ... (November 2016), Unsourced passages need footnotes {{More citations needed}} (March 2024) |
| Morphometrics | High | B | 2 | June 2008 | Expansion needed (June 2008), ... (February 2018) |
| Muggeseggele | Low | Start | 1 | April 2024 | ... (April 2024) |
| Nacre | Mid | B | 4 | March 2014 | Unsourced passages need footnotes {{citation needed}} (March 2014, December 2021, April 2025), ... (July 2025) |
| Nail (anatomy) | Low | C | 7 | July 2007 | Unsourced passages need footnotes {{citation needed}} (July 2007, February 2021, November 2021, October 2022, November 2025), Page number citations needed (June 2021), ... (September 2023) |
| Natatory fringes | Low | Start | 1 | February 2018 | ... (February 2018) |
| Nervous system | Top | B | 1 | August 2025 | ... (August 2025) |
| Otolith | Mid | B | 3 | February 2016 | Unsourced passages need footnotes {{citation needed}} (February 2016), Too technical (March 2021), ... (May 2025) |
| Pelvis | Mid | B | 1 | November 2023 | ... (November 2023) |
| Penis | High | C | 7 | June 2013 | ... (June 2013), Reorganization needed (June 2013), Unsourced passages need footnotes {{citation needed}} (December 2013), Potentially dated statements (2015), CS1 errors: missing periodical, Accuracy disputes or self-published (February 2020), CS1 errors: ISBN date |
| Physiology of dinosaurs | Mid | B | 6 | September 2008 | Unsourced passages need footnotes {{More citations needed}} (September 2008), ... (March 2018, February 2025), Unsourced passages need footnotes {{citation needed}} (May 2020), Pages with broken anchors (see article talk page, remove when fixed), Disputed statements (July 2023) |
| Pituitary gland | Mid | C | 4 | September 2024 | Pages with broken anchors (see article talk page, remove when fixed), Unsourced passages need footnotes {{citation needed}} (September 2024), Unsourced passages need footnotes {{More citations needed}} (November 2024), ... (April 2025) |
| Plumage | Mid | B | 1 | October 2023 | ... (October 2023) |
| Preorbital gland | Low | B | 1 | March 2018 | ... (March 2018) |
| Radula | Mid | C | 4 | September 2008 | Factual verification needed (March 2009), Expansion needed (September 2008), Clarification needed (April 2011), ... (July 2025) |
| Reproductive system of gastropods | Mid | Start | 3 | February 2023 | Broken or outdated citations (February 2023), Unsourced passages need footnotes {{citation needed}} (February 2023), ... (September 2023) |
| Rumen | High | Start | 2 | January 2015 | Has general references but lacks inline footnotes (January 2015), ... (March 2022) |
| Secarecytosis | Low | Stub | 1 | February 2019 | ... (February 2019) |
| Sensory neuron | High | C | 4 | July 2014 | ... (July 2014), Unsourced passages need footnotes {{citation needed}} (March 2017), Unsourced passages need footnotes {{More citations needed}} (September 2017), CS1 errors: periodical ignored |
| Skeletal muscle | High | B | 12 | August 2010 | Unsourced passages need footnotes {{citation needed}} (August 2010, December 2017, January 2021, May 2021, June 2021, October 2022), Unsourced passages need footnotes {{More citations needed}} (March 2016, May 2021, June 2021), ... (April 2020, July 2022), Pages with broken anchors (see article talk page, remove when fixed) |
| Spider web | Mid | C | 2 | October 2010 | ... (October 2010), Harv and Sfn no-target errors |
| Tagma (biology) | Mid | Start | 2 | October 2013 | Has general references but lacks inline footnotes (October 2013), ... (April 2023) |
| Toothcomb | Low | FA | 1 | September 2017 | ... (September 2017) |
| Uncinate processes of ribs | Low | Stub | 1 | July 2018 | ... (July 2018) |
| Uropygial gland | Low | B | 1 | August 2025 | ... (August 2025) |
| Vas deferens | Mid | C | 2 | March 2013 | Unsourced passages need footnotes {{More citations needed}} (March 2013), ... (November 2015) |
| Venom | Mid | GA | 3 | July 2025 | Reference errors, CS1 errors: periodical ignored, ... (July 2025) |
| Vertebra | High | C | 3 | January 2020 | Unsourced passages need footnotes {{citation needed}} (January 2020), Incomplete citations (July 2020), ... (August 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Coral | Mid | GA | 4 | January 2018 | Dead external links {{dead link}} (January 2018), Clarification needed (August 2021, September 2021), ... (August 2023) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Early stages of embryogenesis of tailless amphibians | Low | C | 4 | February 2014 | Too technical (February 2014), Style editing needed (February 2014), Unsourced passages need footnotes {{More citations needed}} (February 2014), ... (June 2024) |
| Fungus pocket | Low | Stub | 2 | June 2024 | Pages with broken anchors (see article talk page, remove when fixed), ... (June 2024) |
| Lateral accessory lobes | Low | Start | 1 | July 2020 | ... (July 2020) |
| Lateral heart | Low | Stub | 1 | January 2017 | ... (January 2017) |
| Mite pocket | Low | Stub | 1 | April 2023 | ... (April 2023) |
| Pulmocutaneous circulation | Low | Stub | 2 | February 2017 | ... (February 2017), Unsourced passages need footnotes {{More citations needed}} (June 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Animal clitoris | Low | C | 2 | CS1 errors: ISBN date | |
| Calves liver | NA | Redirect | 1 | ||
| Clitoris | Low | GA | 2 | CS1 errors: ISBN date | |
| Colic impression on liver | NA | Redirect | 1 | ||
| Cortex (anatomy) | Low | Stub | 1 | ||
| Diaphragmatic surface of liver | NA | Redirect | 1 | ||
| Dinosaur vision | Low | C | 3 | July 2016 | Unsourced passages need footnotes {{citation needed}} (July 2016, August 2021) |
| Duodenal impression on liver | NA | Redirect | 1 | ||
| Extraocular muscles | Mid | C | 1 | ||
| Fibrous capsule of glisson | NA | Redirect | 1 | ||
| Fish anatomy | High | B | 5 | August 2020 | Detailed references needed, Clarification needed (August 2020), Unsourced passages need footnotes {{citation needed}} (August 2020), Factual verification needed (August 2020) |
| Fish reproduction | Mid | C | 2 | August 2018 | Unsourced passages need footnotes {{citation needed}} (August 2018) |
| Fungus pocket | Low | Stub | 2 | June 2024 | Orphaned (June 2024) |
| Gastric impression on liver | NA | Redirect | 1 | ||
| Glabrousness | Low | Start | 3 | February 2017 | Unsourced passages need footnotes {{citation needed}} (February 2017), Weasel-worded phrases (July 2025) |
| Hair | High | B | 5 | September 2010 | Unsourced passages need footnotes {{citation needed}} (September 2010, September 2016, November 2024), Unsourced passages need footnotes {{More citations needed}} (August 2016) |
| Hieronymus Fabricius | Low | Start | 2 | December 2017 | Dead external links {{dead link}} (December 2017) |
| Hyoid bone | Mid | C | 5 | January 2014 | Unsourced passages need footnotes {{citation needed}} (January 2014, April 2022), Clarification needed (February 2022, September 2023) |
| Liver Tissue Blood Flow | NA | Redirect | 1 | ||
| Motor neuron | Mid | C | 2 | CS1 errors: missing periodical | |
| Neuroanatomy | Top | C | 1 | ||
| Parietal eye | Low | Start | 2 | June 2022 | Clarification needed (June 2022) |
| Pedipalp | Low | C | 3 | February 2016 | Weasel-worded phrases (February 2016), Unsourced passages need footnotes {{citation needed}} (November 2019) |
| Physiology of dinosaurs | Mid | B | 6 | September 2008 | Unsourced passages need footnotes {{More citations needed}} (September 2008), Dead external links {{dead link}} (March 2018, February 2025), Unsourced passages need footnotes {{citation needed}} (May 2020), Disputed statements (July 2023) |
| Pituitary gland | Mid | C | 4 | September 2024 | Unsourced passages need footnotes {{citation needed}} (September 2024), Unsourced passages need footnotes {{More citations needed}} (November 2024), Dead external links {{dead link}} (April 2025) |
| Polypide | Low | Stub | 2 | February 2024 | Unsourced passages need footnotes {{More citations needed}} (February 2024) |
| Sensory nervous system | Top | C | 5 | May 2019 | Clarification needed (May 2019), Off-topic sections (May 2019), Unsourced passages need footnotes {{citation needed}} (November 2024), Page number citations needed (November 2024) |
| Skeletal muscle | High | B | 12 | August 2010 | Unsourced passages need footnotes {{citation needed}} (August 2010, December 2017, January 2021, May 2021, June 2021, October 2022), Unsourced passages need footnotes {{More citations needed}} (March 2016, May 2021, June 2021), Dead external links {{dead link}} (April 2020, July 2022) |
| Suprarenal impression | NA | Redirect | 1 | ||
| Suprarenal impression on liver | NA | Redirect | 1 | ||
| Webbed foot | Low | B | 2 | December 2021 | Weasel-worded phrases (December 2021) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Blood type (non-human) | Mid | C | 1 | May 2020 | ... (May 2020) |
| Exocrine gland | Mid | Start | 1 | November 2023 | ... (November 2023) |
| Limbic system | Mid | C | 5 | June 2019 | ... (June 2019), Unsourced passages need footnotes {{citation needed}} (April 2020, January 2023, March 2023, November 2024) |
| Physiology of dinosaurs | Mid | B | 6 | September 2008 | Unsourced passages need footnotes {{More citations needed}} (September 2008), Dead external links {{dead link}} (March 2018, February 2025), Unsourced passages need footnotes {{citation needed}} (May 2020), Pages with broken anchors (see article talk page, remove when fixed), ... (July 2023) |
| Sexual dimorphism | High | B | 8 | October 2016 | ... (October 2016), Clarification needed (July 2018), Unsourced passages need footnotes {{citation needed}} (August 2018, August 2021, November 2021, May 2022), Page number citations needed (August 2021), Cites unreliable sources (August 2021) |
| Tapetum lucidum | Mid | Start | 2 | January 2021 | ... (January 2021), Unsourced passages need footnotes {{citation needed}} (August 2024) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Cat anatomy | High | C | 10 | August 2010 | ... (August 2010, January 2025), Introduction cleanup (November 2018), Unsourced passages need footnotes {{More citations needed}} (August 2022), Unsourced passages need footnotes {{citation needed}} (March 2024), Dead external links {{dead link}} (January 2025), Factual verification needed (January 2025), Accuracy disputes or self-published (January 2025), Cites unreliable sources (January 2025), Page number citations needed (January 2025) |
| Lucky stone | Low | Stub | 1 | September 2009 | ... (September 2009) |
| Morphology of Diptera | Mid | C | 4 | January 2014 | ... (January 2014), Has general references but lacks inline footnotes (January 2014), Clarification needed (August 2020), Unsourced passages need footnotes {{More citations needed}} (August 2020) |
| Pouch (marsupial) | Low | Start | 4 | May 2015 | Unsourced passages need footnotes {{More citations needed}} (May 2015, March 2024), ... (March 2024), Clarification needed (November 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Alae (nematode anatomy) | Mid | Start | 2 | August 2014 | Clarification needed (August 2014), ... (August 2014) |
| Embryological origins of the mouth and anus | High | Start | 1 | May 2022 | ... (May 2022) |
| Feather | High | B | 1 | April 2014 | ... (April 2014) |
| Gill slit | Low | Start | 2 | June 2023 | Unsourced passages need footnotes {{citation needed}} (June 2023), ... (June 2023) |
| Glabrousness | Low | Start | 3 | February 2017 | Unsourced passages need footnotes {{citation needed}} (February 2017), Pages with broken anchors (see article talk page, remove when fixed), ... (July 2025) |
| Larynx | Mid | B | 1 | August 2022 | ... (August 2022) |
| List of animals featuring external asymmetry | Low | List | 3 | April 2013 | Incomplete lists (April 2013), Unsourced passages need footnotes {{citation needed}} (February 2021), ... (February 2021) |
| Love dart | Mid | B | 5 | October 2008 | Unsourced passages need footnotes {{citation needed}} (October 2008), Accuracy disputes or self-published (July 2013), Unsourced passages need footnotes {{More citations needed}} (March 2023), ... (January 2025), Cleanup needed (October 2025) |
| Pedipalp | Low | C | 3 | February 2016 | ... (February 2016), Unsourced passages need footnotes {{citation needed}} (November 2019), Pages with broken anchors (see article talk page, remove when fixed) |
| Pharyngeal slit | Mid | Start | 3 | June 2023 | CS1 errors: missing periodical, Unsourced passages need footnotes {{citation needed}} (June 2023), ... (June 2023) |
| Sweat gland | Low | B | 3 | March 2013 | ... (March 2013), Harv and Sfn no-target errors, CS1 errors: missing title |
| Webbed foot | Low | B | 2 | December 2021 | ... (December 2021), Pages with broken anchors (see article talk page, remove when fixed) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Human sex pheromones | Low | Start | 4 | November 2017 | Expert attention needed (March 2023), Cites unreliable sources (November 2017), ... (March 2023) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Beak | Mid | B | 5 | September 2021 | CS1 errors: missing periodical, Incomplete citations (September 2021), ... (May 2023), Dead external links {{dead link}} (October 2023), CS1 errors: ISBN date |
| Cat anatomy | High | C | 10 | August 2010 | Original research (August 2010, January 2025), Introduction cleanup (November 2018), Unsourced passages need footnotes {{More citations needed}} (August 2022), Unsourced passages need footnotes {{citation needed}} (March 2024), Dead external links {{dead link}} (January 2025), Factual verification needed (January 2025), ... (January 2025), Cites unreliable sources (January 2025), Page number citations needed (January 2025) |
| Love dart | Mid | B | 5 | October 2008 | Unsourced passages need footnotes {{citation needed}} (October 2008), ... (July 2013), Unsourced passages need footnotes {{More citations needed}} (March 2023), Weasel-worded phrases (January 2025), Cleanup needed (October 2025) |
| Penis | High | C | 7 | June 2013 | Dead external links {{dead link}} (June 2013), Reorganization needed (June 2013), Unsourced passages need footnotes {{citation needed}} (December 2013), Potentially dated statements (2015), CS1 errors: missing periodical, ... (February 2020), CS1 errors: ISBN date |
| Photophore | Mid | Start | 2 | March 2025 | ... (March 2025), Unsourced passages need footnotes {{citation needed}} (June 2025) |
| Polyphyodont | Mid | Start | 2 | August 2022 | Cites unreliable sources (August 2022), ... (August 2022) |
| Pseudo-penis | Low | Start | 4 | May 2017 | Failed verification (May 2017), Unsourced passages need footnotes {{citation needed}} (May 2019), ... (December 2019), Harv and Sfn no-target errors |
| Thoracic diaphragm | High | C | 5 | August 2011 | ... (August 2011), Unsourced passages need footnotes {{citation needed}} (May 2013, April 2022), Incomplete citations (June 2020), CS1 errors: missing title |
| Vomeronasal organ | Mid | C | 2 | December 2017 | ... (December 2017, December 2017) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Reproductive system of gastropods | Mid | Start | 3 | February 2023 | ... (February 2023), Unsourced passages need footnotes {{citation needed}} (February 2023), Dead external links {{dead link}} (September 2023) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Anal gland | Mid | Start | 2 | July 2023 | Clarification needed (July 2023) |
| Anatomy | Top | GA | 1 | ||
| Animal clitoris | Low | C | 2 | Pages with broken anchors (see article talk page, remove when fixed) | |
| Baculum | Mid | Start | 3 | March 2020 | Clarification needed (March 2020), Cites unreliable sources (April 2020) |
| Beak | Mid | B | 5 | September 2021 | CS1 errors: missing periodical, Incomplete citations (September 2021), Accuracy disputes or self-published (May 2023), Dead external links {{dead link}} (October 2023) |
| Bird anatomy | High | B | 3 | September 2018 | Unsourced passages need footnotes {{More citations needed}} (September 2018), Clarification needed (April 2021) |
| Clitoris | Low | GA | 2 | Pages with broken anchors (see article talk page, remove when fixed) | |
| Cuticle | Mid | C | 1 | ||
| Electric organ (fish) | Low | GA | 1 | ||
| Esophagus | Mid | GA | 4 | 2014 | Potentially dated statements (2014, 2021), Unsourced passages need footnotes {{citation needed}} (October 2025) |
| External morphology of Lepidoptera | High | GA | 4 | December 2016 | Dead external links {{dead link}} (December 2016, December 2019), CS1 errors: periodical ignored |
| Flight feather | Mid | FA | 1 | ||
| Gill | Mid | C | 3 | March 2025 | CS1 errors: missing title, Clarification needed (March 2025) |
| Glossary of mammalian dental topography | Low | List | 2 | February 2011 | Incomplete lists (February 2011) |
| Halteres | Mid | Start | 2 | March 2024 | Page number citations needed (March 2024) |
| Hering's law of equal innervation | Low | Start | 1 | ||
| Hermaphroditic duct | Low | Start | 1 | ||
| Metamerism (biology) | Mid | Start | 2 | October 2013 | Has general references but lacks inline footnotes (October 2013) |
| Osteoblast | Mid | C | 3 | October 2019 | Page number citations needed (October 2019), Unsourced passages need footnotes {{citation needed}} (May 2023) |
| Penis | High | C | 7 | June 2013 | Dead external links {{dead link}} (June 2013), Reorganization needed (June 2013), Unsourced passages need footnotes {{citation needed}} (December 2013), Potentially dated statements (2015), CS1 errors: missing periodical, Accuracy disputes or self-published (February 2020) |
| Phalanx bone | Mid | C | 5 | January 2014 | Expansion needed (January 2014), Too technical (January 2014), Harv and Sfn no-target errors, Unsourced passages need footnotes {{citation needed}} (November 2021) |
| Premaxilla | Low | Start | 1 | ||
| Scallop | Mid | B | 12 | January 2017 | Unsourced passages need footnotes {{citation needed}} (January 2017, March 2018, July 2024), Page number citations needed (January 2017), Cites unreliable sources (January 2017, April 2018, October 2020), CS1 errors: periodical ignored, Cleanup needed (July 2025, July 2025), Unsourced passages need footnotes {{More citations needed}} (July 2025) |
| Sense of smell | High | C | 3 | February 2021 | Unsourced passages need footnotes {{citation needed}} (February 2021, March 2021) |
| Symmetry in biology | Top | C | 1 | ||
| Tongue | Mid | B | 4 | October 2022 | Page number citations needed (October 2022), Unsourced passages need footnotes {{More citations needed}} (October 2022), Vague or ambiguous time (April 2024) |
| Zygosphene-zygantrum articulation | Low | Start | 1 |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Cat senses | Mid | B | 3 | April 2023 | CS1 errors: missing title, Failed verification (April 2023) |
| Eggshell | Mid | Start | 5 | March 2016 | Dead external links {{dead link}} (March 2016), Unsourced passages need footnotes {{citation needed}} (September 2017, July 2021), CS1 errors: missing title |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Crurotarsal | Low | Start | 1 | ||
| Elastic cartilage | Low | C | 1 | ||
| Fish scale | Mid | B | 2 | September 2025 | Dead external links {{dead link}} (September 2025) |
| Insect morphology | High | B | 4 | November 2017 | Dead external links {{dead link}} (November 2017), CS1 errors: missing periodical, Unsourced passages need footnotes {{citation needed}} (December 2023) |
| Small intestine | Mid | C | 2 | May 2022 | Unsourced passages need footnotes {{citation needed}} (May 2022) |
| Spicule (nematode anatomy) | Low | Stub | 1 |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Beak | Mid | B | 5 | September 2021 | Incomplete citations (September 2021), Accuracy disputes or self-published (May 2023), Dead external links {{dead link}} (October 2023), CS1 errors: ISBN date |
| Caryophyllidia | Low | Stub | 1 | ||
| Hoof | Low | Start | 1 | ||
| Insect morphology | High | B | 4 | November 2017 | Dead external links {{dead link}} (November 2017), CS1 errors: generic name, Unsourced passages need footnotes {{citation needed}} (December 2023) |
| Motor neuron | Mid | C | 2 | Pages with broken anchors (see article talk page, remove when fixed) | |
| Nephridiopore | Low | Stub | 1 | ||
| Nucleus incertus | Low | Start | 2 | CS1 errors: requires URL | |
| Olfactory receptor neuron | Low | C | 2 | February 2018 | Expansion needed (February 2018) |
| Penis | High | C | 7 | June 2013 | Dead external links {{dead link}} (June 2013), Reorganization needed (June 2013), Unsourced passages need footnotes {{citation needed}} (December 2013), Potentially dated statements (2015), Accuracy disputes or self-published (February 2020), CS1 errors: ISBN date |
| Pharyngeal slit | Mid | Start | 3 | June 2023 | Unsourced passages need footnotes {{citation needed}} (June 2023), Weasel-worded phrases (June 2023) |
| Spider anatomy | High | B | 2 | June 2024 | Has general references but lacks inline footnotes (June 2024) |
| Throat | Mid | Start | 1 |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Cat senses | Mid | B | 3 | April 2023 | CS1 errors: bare URL, Failed verification (April 2023) |
| Eggshell | Mid | Start | 5 | March 2016 | Dead external links {{dead link}} (March 2016), Unsourced passages need footnotes {{citation needed}} (September 2017, July 2021), CS1 errors: bare URL |
| Gill | Mid | C | 3 | March 2025 | Clarification needed (March 2025), CS1 errors: ISBN date |
| Mollusc shell | Mid | C | 1 | ||
| Sweat gland | Low | B | 3 | March 2013 | Weasel-worded phrases (March 2013), Harv and Sfn no-target errors |
| Thoracic diaphragm | High | C | 5 | August 2011 | Accuracy disputes or self-published (August 2011), Unsourced passages need footnotes {{citation needed}} (May 2013, April 2022), Incomplete citations (June 2020) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Auditory cortex | Mid | C | 3 | May 2014 | Unsourced passages need footnotes {{citation needed}} (May 2014, June 2023) |
| Basal retinal neuron | Low | Start | 2 | May 2025 | Style editing needed (May 2025) |
| Biological system | Mid | C | 1 | ||
| Cloven hoof | Low | C | 1 | ||
| Dog coat | Low | C | 1 | ||
| Exoskeleton | High | C | 4 | September 2020 | Unsourced passages need footnotes {{citation needed}} (September 2020, May 2023), Clarification needed (September 2020) |
| External morphology of Lepidoptera | High | GA | 4 | December 2016 | Dead external links {{dead link}} (December 2016, December 2019), CS1 errors: ISBN date |
| Homology (biology) | High | GA | 1 | ||
| Kidney | Mid | C | 3 | June 2022 | Unsourced passages need footnotes {{citation needed}} (June 2022, November 2023) |
| Mammalian kidney | Low | B | 1 | ||
| Mycangium | Low | Start | 1 | ||
| Nervous tissue | High | C | 1 | ||
| Olfactory tubercle | Low | C | 1 | ||
| Reticular formation | Mid | C | 10 | November 2009 | Unsourced passages need footnotes {{citation needed}} (November 2009, February 2012, March 2017, September 2017, September 2021, May 2024, August 2024), Clarification needed (September 2019), Unsourced passages need footnotes {{More citations needed}} (October 2019) |
| Scallop | Mid | B | 12 | January 2017 | Unsourced passages need footnotes {{citation needed}} (January 2017, March 2018, July 2024), Page number citations needed (January 2017), Cites unreliable sources (January 2017, April 2018, October 2020), CS1 errors: ISBN date, Cleanup needed (July 2025, July 2025), Unsourced passages need footnotes {{More citations needed}} (July 2025) |
| Sensory neuron | High | C | 4 | July 2014 | Dead external links {{dead link}} (July 2014), Unsourced passages need footnotes {{citation needed}} (March 2017), Unsourced passages need footnotes {{More citations needed}} (September 2017) |
| Spinal cord | High | C | 6 | December 2016 | Unsourced passages need footnotes {{citation needed}} (December 2016, December 2024), Unsourced passages need footnotes {{More citations needed}} (January 2024), Page number citations needed (September 2024), Too technical (January 2025) |
| Tentacle | Mid | Start | 2 | October 2023 | Page number citations needed (October 2023) |
| Tympanal organ | Mid | Stub | 1 | ||
| Uropod | Low | Start | 1 | ||
| Venom | Mid | GA | 3 | July 2025 | Reference errors, Dead external links {{dead link}} (July 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Jaw | High | C | 1 | ||
| Nucleus incertus | Low | Start | 2 | CS1 errors: missing periodical |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Amphid | Low | Stub | 1 | August 2025 | ... (August 2025) |
| Convoluted tubule | Low | Stub | 1 | December 2009 | ... (December 2009) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Albinism | Mid | C | 3 | March 2021 | Unsourced passages need footnotes {{citation needed}} (March 2021), Unsourced passages need footnotes {{More citations needed}} (April 2023), ... (November 2023) |
| Baculum | Mid | Start | 3 | March 2020 | Clarification needed (March 2020), ... (April 2020), CS1 errors: ISBN date |
| Bird wing | Low | C | 1 | June 2025 | ... (June 2025) |
| Bulbourethral gland | Low | Start | 1 | January 2013 | ... (January 2013) |
| Cat anatomy | High | C | 10 | August 2010 | Original research (August 2010, January 2025), Introduction cleanup (November 2018), Unsourced passages need footnotes {{More citations needed}} (August 2022), Unsourced passages need footnotes {{citation needed}} (March 2024), Dead external links {{dead link}} (January 2025), Factual verification needed (January 2025), Accuracy disputes or self-published (January 2025), ... (January 2025), Page number citations needed (January 2025) |
| Cloaca | Mid | C | 1 | July 2019 | ... (July 2019) |
| Digital Fish Library | Low | Stub | 2 | August 2009 | ... (August 2009), Unsourced passages need footnotes {{More citations needed}} (August 2009) |
| Human sex pheromones | Low | Start | 4 | November 2017 | Expert attention needed (March 2023), ... (November 2017), Wikipedia neutral point of view disputes (March 2023) |
| Male accessory gland | Low | C | 3 | September 2018 | Unsourced passages need footnotes {{More citations needed}} (September 2018), Unsourced passages need footnotes {{citation needed}} (September 2021), ... (March 2024) |
| Mesoderm | Mid | C | 3 | June 2011 | ... (June 2011), Dead external links {{dead link}} (January 2018), Unsourced passages need footnotes {{More citations needed}} (May 2022) |
| Myomere | Mid | Stub | 6 | April 2025 | ... (April 2025), Unsourced passages need footnotes {{More citations needed}} (April 2025), Unsourced passages need footnotes {{citation needed}} (April 2025), Page number citations needed (April 2025), Style editing needed (April 2025), Clarification needed (June 2025) |
| Nipple | Low | C | 2 | September 2021 | ... (September 2021), Unsourced passages need footnotes {{citation needed}} (November 2021) |
| Notochord | High | C | 3 | January 2011 | Unsourced passages need footnotes {{citation needed}} (January 2011), Too technical (February 2017), ... (September 2022) |
| Polyphyodont | Mid | Start | 2 | August 2022 | ... (August 2022), Accuracy disputes or self-published (August 2022) |
| Scallop | Mid | B | 12 | January 2017 | Unsourced passages need footnotes {{citation needed}} (January 2017, March 2018, July 2024), Page number citations needed (January 2017), ... (January 2017, April 2018, October 2020), CS1 errors: periodical ignored, CS1 errors: ISBN date, Cleanup needed (July 2025, July 2025), Unsourced passages need footnotes {{More citations needed}} (July 2025) |
| Sexual dimorphism | High | B | 8 | October 2016 | Disputed statements (October 2016), Clarification needed (July 2018), Unsourced passages need footnotes {{citation needed}} (August 2018, August 2021, November 2021, May 2022), Page number citations needed (August 2021), ... (August 2021) |
| Skull | Mid | C | 2 | December 2018 | Unsourced passages need footnotes {{citation needed}} (December 2018), ... (November 2022) |
| Spinal column | High | C | 1 | February 2019 | ... (February 2019) |
| Stabilimentum | Low | Start | 3 | April 2009 | ... (April 2009), Unsourced passages need footnotes {{citation needed}} (November 2019, April 2022) |
| Vergence | Low | C | 2 | January 2011 | Unsourced passages need footnotes {{citation needed}} (January 2011), ... (September 2019) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Dentition | High | B | 2 | October 2025 | Unsourced passages need footnotes {{More citations needed}} (October 2025) |
| Digestion | High | C | 4 | May 2011 | Unsourced passages need footnotes {{citation needed}} (May 2011), Expansion needed (August 2011), Unsourced passages need footnotes {{More citations needed}} (July 2022) |
| Fish anatomy | High | B | 5 | August 2020 | Clarification needed (August 2020), Unsourced passages need footnotes {{citation needed}} (August 2020), Factual verification needed (August 2020), Pages with broken anchors (see article talk page, remove when fixed) |
| Fossorial | Mid | C | 1 |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Acromion | Low | Start | 2 | January 2016 | Clarification needed (January 2016), ... (November 2025) |
| Amygdala | Mid | B | 1 | September 2025 | ... (September 2025) |
| Cat anatomy | High | C | 10 | August 2010 | Original research (August 2010, January 2025), Introduction cleanup (November 2018), Unsourced passages need footnotes {{More citations needed}} (August 2022), Unsourced passages need footnotes {{citation needed}} (March 2024), Dead external links {{dead link}} (January 2025), ... (January 2025), Accuracy disputes or self-published (January 2025), Cites unreliable sources (January 2025), Page number citations needed (January 2025) |
| Fish anatomy | High | B | 5 | August 2020 | Detailed references needed, Clarification needed (August 2020), Unsourced passages need footnotes {{citation needed}} (August 2020), ... (August 2020), Pages with broken anchors (see article talk page, remove when fixed) |
| Radula | Mid | C | 4 | September 2008 | ... (March 2009), Expansion needed (September 2008), Clarification needed (April 2011), Dead external links {{dead link}} (July 2025) |
| Spider silk | Mid | B | 5 | May 2013 | Unsourced passages need footnotes {{citation needed}} (May 2013, January 2024, July 2025), Page number citations needed (September 2013), ... (June 2018) |
| Squid giant synapse | Mid | Start | 2 | June 2017 | Page number citations needed (June 2017), ... (June 2017) |
| Trab | Low | Start | 1 | April 2010 | ... (April 2010) |
| Zona pellucida | Low | Start | 2 | August 2011 | ... (August 2011), Unsourced passages need footnotes {{citation needed}} (May 2024) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Bird vision | Mid | B | 4 | December 2014 | Unsourced passages need footnotes {{citation needed}} (December 2014, September 2015, June 2021), ... (August 2025) |
| Cat senses | Mid | B | 3 | April 2023 | CS1 errors: missing title, CS1 errors: bare URL, ... (April 2023) |
| Chameleon vision | Mid | C | 2 | May 2025 | Clarification needed (May 2025), ... (May 2025) |
| Deer penis | Low | C | 1 | May 2025 | ... (May 2025) |
| Eye | High | B | 1 | June 2016 | ... (June 2016) |
| Pseudo-penis | Low | Start | 4 | May 2017 | ... (May 2017), Unsourced passages need footnotes {{citation needed}} (May 2019), Accuracy disputes or self-published (December 2019), Harv and Sfn no-target errors |
| Sexual reproduction | High | C | 3 | December 2023 | ... (December 2023), Unsourced passages need footnotes {{citation needed}} (August 2025), Introduction cleanup (August 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Phalanx bone | Mid | C | 5 | January 2014 | Expansion needed (January 2014), Too technical (January 2014), Unsourced passages need footnotes {{citation needed}} (November 2021), CS1 errors: ISBN date |
| Pseudo-penis | Low | Start | 4 | May 2017 | Failed verification (May 2017), Unsourced passages need footnotes {{citation needed}} (May 2019), Accuracy disputes or self-published (December 2019) |
| Scleral cartilage | Low | C | 1 | ||
| Spider web | Mid | C | 2 | October 2010 | Dead external links {{dead link}} (October 2010) |
| Sweat gland | Low | B | 3 | March 2013 | Weasel-worded phrases (March 2013), CS1 errors: missing title |
| Urticating hair | Low | B | 1 |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Aptychus | Low | Start | 1 | November 2013 | ... (November 2013) |
| Clausilium | Low | Stub | 1 | November 2016 | ... (November 2016) |
| Covert feather | Low | Start | 1 | May 2018 | ... (May 2018) |
| Cribellum | Mid | C | 2 | November 2020 | ... (November 2020), Unsourced passages need footnotes {{citation needed}} (December 2020) |
| Dewlap | Low | C | 2 | August 2011 | ... (August 2011), Unsourced passages need footnotes {{citation needed}} (November 2016) |
| Fibrocartilage | Low | Start | 1 | May 2015 | ... (May 2015) |
| Foramen of Panizza | Low | Stub | 1 | January 2023 | ... (January 2023) |
| Gemmule | Low | Stub | 1 | March 2016 | ... (March 2016) |
| Holoptic arrangement | Low | Stub | 1 | June 2020 | ... (June 2020) |
| Intromittent organ | High | Start | 2 | February 2013 | ... (February 2013), Unsourced passages need footnotes {{citation needed}} (September 2015) |
| Metamerism (biology) | Mid | Start | 2 | October 2013 | ... (October 2013), CS1 errors: ISBN date |
| Morphology of Diptera | Mid | C | 4 | January 2014 | Original research (January 2014), ... (January 2014), Clarification needed (August 2020), Unsourced passages need footnotes {{More citations needed}} (August 2020) |
| Morphome | Low | Stub | 1 | February 2008 | ... (February 2008) |
| Nephridium | Low | Start | 1 | September 2025 | ... (September 2025) |
| Paw | Mid | Stub | 1 | November 2022 | ... (November 2022) |
| Physostome | Low | Stub | 1 | March 2024 | ... (March 2024) |
| Respiratory system of gastropods | Mid | C | 1 | July 2011 | ... (July 2011) |
| Rumen | High | Start | 2 | January 2015 | ... (January 2015), Dead external links {{dead link}} (March 2022) |
| Sexual dimorphism in non-human primates | Mid | Start | 1 | February 2023 | ... (February 2023) |
| Sexual dimorphism measures | Low | C | 4 | August 2021 | Unsourced passages need footnotes {{More citations needed}} (August 2021), ... (August 2021), Style editing needed (July 2025), Clarification needed (November 2025) |
| Solid white (chicken plumage) | Low | C | 2 | June 2014 | ... (June 2014), Unsourced passages need footnotes {{More citations needed}} (November 2024) |
| Spider anatomy | High | B | 2 | June 2024 | CS1 errors: missing periodical, ... (June 2024) |
| Stomatogastric nervous system | Mid | Start | 1 | November 2014 | ... (November 2014) |
| Tagma (biology) | Mid | Start | 2 | October 2013 | ... (October 2013), Dead external links {{dead link}} (April 2023) |
| Tarsometatarsus | Low | Start | 2 | May 2023 | Unsourced passages need footnotes {{More citations needed}} (May 2023), ... (May 2023) |
| Torsion (gastropod) | Mid | Start | 1 | November 2009 | ... (November 2009) |
| Vision in toads | Mid | C | 1 | December 2020 | ... (December 2020) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Antler | Mid | C | 3 | April 2015 | Unsourced passages need footnotes {{citation needed}} (April 2015, November 2025), ... (April 2015) |
| Beak | Mid | B | 5 | September 2021 | CS1 errors: missing periodical, ... (September 2021), Accuracy disputes or self-published (May 2023), Dead external links {{dead link}} (October 2023), CS1 errors: ISBN date |
| Gastropod shell | Mid | C | 5 | December 2013 | ... (December 2013), Page number citations needed (October 2020), Unsourced passages need footnotes {{citation needed}} (October 2020, May 2023), Dead external links {{dead link}} (May 2025) |
| Hide (skin) | Low | Start | 3 | April 2015 | Unsourced passages need footnotes {{citation needed}} (April 2015, April 2025), ... (July 2020) |
| Hip bone | Mid | C | 1 | March 2019 | ... (March 2019) |
| Labrum (arthropod mouthpart) | Low | Start | 1 | November 2017 | ... (November 2017) |
| Nerve | High | C | 2 | September 2022 | ... (September 2022), Rewrite needed (April 2025) |
| Organ of Bojanus | Low | Stub | 1 | July 2018 | ... (July 2018) |
| Pecten (biology) | Low | Stub | 2 | July 2018 | Unsourced passages need footnotes {{More citations needed}} (July 2018), ... (July 2024) |
| Thoracic diaphragm | High | C | 5 | August 2011 | Accuracy disputes or self-published (August 2011), Unsourced passages need footnotes {{citation needed}} (May 2013, April 2022), ... (June 2020), CS1 errors: missing title |
| Vertebra | High | C | 3 | January 2020 | Unsourced passages need footnotes {{citation needed}} (January 2020), ... (July 2020), Dead external links {{dead link}} (August 2025) |
| Whiskers | Mid | C | 3 | April 2021 | Too technical (April 2021), ... (March 2022), Unsourced passages need footnotes {{citation needed}} (March 2024) |
| Yolk | Mid | C | 2 | July 2013 | ... (July 2013), Unsourced passages need footnotes {{More citations needed}} (May 2022) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Cat anatomy | High | C | 10 | August 2010 | Original research (August 2010, January 2025), Introduction cleanup (November 2018), Unsourced passages need footnotes {{More citations needed}} (August 2022), Unsourced passages need footnotes {{citation needed}} (March 2024), Dead external links {{dead link}} (January 2025), Factual verification needed (January 2025), Accuracy disputes or self-published (January 2025), Cites unreliable sources (January 2025), ... (January 2025) |
| Cercus | Low | C | 1 | June 2021 | ... (June 2021) |
| Development of the nervous system | Mid | C | 2 | May 2020 | ... (May 2020), Unsourced passages need footnotes {{citation needed}} (April 2025) |
| Dog anatomy | High | B | 4 | September 2010 | ... (September 2010), Unsourced passages need footnotes {{More citations needed}} (June 2015), Dead external links {{dead link}} (August 2025), Unsourced passages need footnotes {{citation needed}} (August 2025) |
| Dorsal nerve cord | Mid | Stub | 2 | June 2013 | Unsourced passages need footnotes {{More citations needed}} (June 2013), ... (November 2024) |
| Dufour's gland | Mid | Start | 1 | February 2025 | ... (February 2025) |
| Egg | High | B | 1 | January 2023 | ... (January 2023) |
| Endostyle | Low | B | 2 | May 2025 | ... (May 2025), Unsourced passages need footnotes {{citation needed}} (June 2025) |
| Eye color | Low | C | 5 | 2006 | Potentially dated statements (2006, 2010), Unsourced passages need footnotes {{More citations needed}} (November 2012), ... (May 2020), Unsourced passages need footnotes {{citation needed}} (February 2022) |
| Frog (horse anatomy) | Low | Start | 2 | September 2021 | ... (September 2021), Unsourced passages need footnotes {{citation needed}} (December 2023) |
| Gastropod shell | Mid | C | 5 | December 2013 | Incomplete citations (December 2013), ... (October 2020), Unsourced passages need footnotes {{citation needed}} (October 2020, May 2023), Dead external links {{dead link}} (May 2025) |
| Gizzard | Mid | Start | 2 | November 2021 | Unsourced passages need footnotes {{citation needed}} (November 2021), ... (January 2025) |
| Halteres | Mid | Start | 2 | March 2024 | ... (March 2024), CS1 errors: ISBN date |
| Ileum | Mid | C | 2 | June 2015 | ... (June 2015), Unsourced passages need footnotes {{citation needed}} (September 2024) |
| Insect mouthparts | Mid | Start | 3 | June 2018 | ... (June 2018), Unsourced passages need footnotes {{More citations needed}} (December 2023), Unsourced passages need footnotes {{citation needed}} (July 2025) |
| Kinocilium | Low | C | 2 | April 2014 | ... (April 2014), Unsourced passages need footnotes {{citation needed}} (December 2023) |
| Lung | Top | GA | 1 | January 2018 | ... (January 2018) |
| Maxilla (arthropod mouthpart) | Low | C | 1 | February 2025 | ... (February 2025) |
| Muscle | High | C | 3 | April 2014 | ... (April 2014), Unsourced passages need footnotes {{citation needed}} (June 2021, May 2023) |
| Myomere | Mid | Stub | 6 | April 2025 | Cites unreliable sources (April 2025), Unsourced passages need footnotes {{More citations needed}} (April 2025), Unsourced passages need footnotes {{citation needed}} (April 2025), ... (April 2025), Style editing needed (April 2025), Clarification needed (June 2025) |
| Nail (anatomy) | Low | C | 7 | July 2007 | Unsourced passages need footnotes {{citation needed}} (July 2007, February 2021, November 2021, October 2022, November 2025), ... (June 2021), Dead external links {{dead link}} (September 2023) |
| Nose | Mid | C | 1 | July 2020 | ... (July 2020) |
| Notum | Low | Stub | 2 | January 2025 | Unsourced passages need footnotes {{citation needed}} (January 2025), ... (March 2025) |
| Organ (biology) | Top | C | 5 | May 2015 | ... (May 2015), Unsourced passages need footnotes {{citation needed}} (February 2018, May 2021, August 2021), Expansion needed (February 2018) |
| Osphradium | Low | Stub | 2 | May 2025 | ... (May 2025), Unsourced passages need footnotes {{citation needed}} (May 2025) |
| Osteoblast | Mid | C | 3 | October 2019 | ... (October 2019), Unsourced passages need footnotes {{citation needed}} (May 2023), CS1 errors: ISBN date |
| Patagium | Mid | C | 2 | July 2020 | Unsourced passages need footnotes {{citation needed}} (July 2020), ... (December 2021) |
| Petiole (insect anatomy) | Low | Start | 1 | December 2024 | ... (December 2024) |
| Placenta | Mid | C | 3 | January 2021 | Unsourced passages need footnotes {{citation needed}} (January 2021, September 2023), ... (August 2021) |
| Polydactyly in stem-tetrapods | Low | Start | 1 | October 2020 | ... (October 2020) |
| Respiratory system | Top | B | 3 | September 2010 | ... (September 2010), Unsourced passages need footnotes {{citation needed}} (December 2023, September 2025) |
| Scallop | Mid | B | 12 | January 2017 | Unsourced passages need footnotes {{citation needed}} (January 2017, March 2018, July 2024), ... (January 2017), Cites unreliable sources (January 2017, April 2018, October 2020), CS1 errors: periodical ignored, CS1 errors: ISBN date, Cleanup needed (July 2025, July 2025), Unsourced passages need footnotes {{More citations needed}} (July 2025) |
| Sensory nervous system | Top | C | 5 | May 2019 | Clarification needed (May 2019), Off-topic sections (May 2019), Pages with broken anchors (see article talk page, remove when fixed), Unsourced passages need footnotes {{citation needed}} (November 2024), ... (November 2024) |
| Sensory organs of gastropods | Mid | Start | 2 | December 2009 | Expansion needed (December 2009), ... (May 2014) |
| Sex organ | High | C | 2 | August 2021 | ... (August 2021), Unsourced passages need footnotes {{More citations needed}} (August 2021) |
| Sexual dimorphism | High | B | 8 | October 2016 | Disputed statements (October 2016), Clarification needed (July 2018), Unsourced passages need footnotes {{citation needed}} (August 2018, August 2021, November 2021, May 2022), ... (August 2021), Cites unreliable sources (August 2021) |
| Skeleton | Top | C | 2 | August 2021 | Unsourced passages need footnotes {{citation needed}} (August 2021), ... (August 2021) |
| Spider silk | Mid | B | 5 | May 2013 | Unsourced passages need footnotes {{citation needed}} (May 2013, January 2024, July 2025), ... (September 2013), Factual verification needed (June 2018) |
| Spinal cord | High | C | 6 | December 2016 | Unsourced passages need footnotes {{citation needed}} (December 2016, December 2024), CS1 errors: periodical ignored, Unsourced passages need footnotes {{More citations needed}} (January 2024), ... (September 2024), Too technical (January 2025) |
| Squid giant synapse | Mid | Start | 2 | June 2017 | ... (June 2017), Factual verification needed (June 2017) |
| Stem cell | Mid | B | 4 | 2016 | Potentially dated statements (2016), ... (January 2019, August 2021), Unsourced passages need footnotes {{citation needed}} (August 2021) |
| Tentacle | Mid | Start | 2 | October 2023 | CS1 errors: periodical ignored, ... (October 2023) |
| Testicle | Mid | B | 4 | May 2008 | Unsourced passages need footnotes {{citation needed}} (May 2008, July 2017), ... (April 2022), Unsourced passages need footnotes {{More citations needed}} (May 2025) |
| Thagomizer | Low | C | 1 | June 2020 | ... (June 2020) |
| Tongue | Mid | B | 4 | October 2022 | ... (October 2022), Unsourced passages need footnotes {{More citations needed}} (October 2022), Vague or ambiguous time (April 2024), CS1 errors: ISBN date |
| Vision in fish | Mid | B | 1 | March 2021 | ... (March 2021) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Tail (horse) | Low | C | 3 | July 2011 | Unsourced passages need footnotes {{More citations needed}} (July 2011), Potentially dated statements (2025) |
| Venom | Mid | GA | 3 | July 2025 | CS1 errors: periodical ignored, Dead external links {{dead link}} (July 2025) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Aedeagus | Mid | Start | 1 | April 2014 | ... (April 2014) |
| Albinism | Mid | C | 3 | March 2021 | Unsourced passages need footnotes {{citation needed}} (March 2021), ... (April 2023), Cites unreliable sources (November 2023) |
| Amnion | Mid | Start | 2 | June 2021 | ... (June 2021), Unsourced passages need footnotes {{citation needed}} (June 2024) |
| Anal cell | Low | Stub | 1 | December 2025 | ... (December 2025) |
| Angular bone | Low | Stub | 1 | April 2024 | ... (April 2024) |
| Apex (mollusc) | Low | Stub | 1 | April 2023 | ... (April 2023) |
| Armour (zoology) | Mid | Start | 1 | July 2024 | ... (July 2024) |
| Arthropod eye | Mid | C | 2 | January 2015 | Unsourced passages need footnotes {{citation needed}} (January 2015), ... (September 2025) |
| Arthropod leg | Mid | C | 7 | December 2017 | Unsourced passages need footnotes {{citation needed}} (December 2017, February 2025, March 2025), ... (March 2025), Cleanup needed (May 2025, May 2025), Expansion needed (May 2025) |
| Arthropod mouthparts | Mid | Start | 2 | December 2013 | ... (December 2013), Clarification needed (July 2025) |
| Back (horse) | Low | C | 1 | August 2014 | ... (August 2014) |
| Bacteriocyte | Low | C | 1 | November 2024 | ... (November 2024) |
| Baleen | Low | Start | 3 | September 2022 | Clarification needed (September 2022), ... (April 2025), Unsourced passages need footnotes {{citation needed}} (November 2025) |
| Bidder's organ | Low | Start | 1 | November 2008 | ... (November 2008) |
| Bird anatomy | High | B | 3 | September 2018 | ... (September 2018), Clarification needed (April 2021), CS1 errors: ISBN date |
| Brindle | Low | Start | 1 | October 2009 | ... (October 2009) |
| Callus (mollusc) | Low | Stub | 1 | August 2011 | ... (August 2011) |
| Cat anatomy | High | C | 10 | August 2010 | Original research (August 2010, January 2025), Introduction cleanup (November 2018), ... (August 2022), Unsourced passages need footnotes {{citation needed}} (March 2024), Dead external links {{dead link}} (January 2025), Factual verification needed (January 2025), Accuracy disputes or self-published (January 2025), Cites unreliable sources (January 2025), Page number citations needed (January 2025) |
| Caudal ramus | Low | Stub | 1 | November 2020 | ... (November 2020) |
| Cephalic index | Mid | Start | 2 | December 2021 | ... (December 2021), Unsourced passages need footnotes {{citation needed}} (January 2025) |
| Cephalon (arthropod head) | Mid | Start | 1 | December 2013 | ... (December 2013) |
| Chalaza | Mid | Start | 1 | December 2009 | ... (December 2009) |
| Chin shields | Low | Stub | 1 | June 2024 | ... (June 2024) |
| Choanocyte | Low | Start | 1 | December 2009 | ... (December 2009) |
| Clavicle | Mid | C | 2 | July 2009 | ... (July 2009), Unsourced passages need footnotes {{citation needed}} (October 2024) |
| Collophore | Low | Stub | 1 | March 2025 | ... (March 2025) |
| Comparative biology | Low | Start | 1 | January 2025 | ... (January 2025) |
| Conchology | Mid | C | 3 | July 2016 | ... (July 2016), Potentially dated statements (2020), Dead external links {{dead link}} (July 2020) |
| Decapod anatomy | High | C | 2 | April 2025 | ... (April 2025), Unsourced passages need footnotes {{citation needed}} (May 2025) |
| Dentition | High | B | 2 | October 2025 | Detailed references needed, ... (October 2025) |
| Digestion | High | C | 4 | May 2011 | Detailed references needed, Unsourced passages need footnotes {{citation needed}} (May 2011), Expansion needed (August 2011), ... (July 2022) |
| Digital Fish Library | Low | Stub | 2 | August 2009 | Cites unreliable sources (August 2009), ... (August 2009) |
| Dog anatomy | High | B | 4 | September 2010 | Page number citations needed (September 2010), ... (June 2015), Dead external links {{dead link}} (August 2025), Unsourced passages need footnotes {{citation needed}} (August 2025) |
| Dorsal nerve cord | Mid | Stub | 2 | June 2013 | ... (June 2013), Page number citations needed (November 2024) |
| Ear tuft | Low | Start | 1 | September 2017 | ... (September 2017) |
| Early stages of embryogenesis of tailless amphibians | Low | C | 4 | February 2014 | Too technical (February 2014), Style editing needed (February 2014), ... (February 2014), Orphaned (June 2024) |
| Epicondyle | Low | Stub | 1 | November 2025 | ... (November 2025) |
| Epimorphosis | Low | Start | 1 | December 2013 | ... (December 2013) |
| Equine conformation | Low | Start | 4 | November 2010 | ... (November 2010), Unsourced passages need footnotes {{citation needed}} (November 2020), Cleanup needed (January 2024, January 2024) |
| Evolution of the eye | High | C | 3 | December 2008 | Clarification needed (December 2008, March 2017), ... (October 2016) |
| Excretory system | Top | C | 4 | April 2015 | ... (April 2015), Unsourced passages need footnotes {{citation needed}} (May 2015, April 2024), Expansion needed (November 2017) |
| Eye color | Low | C | 5 | 2006 | Potentially dated statements (2006, 2010), ... (November 2012), Page number citations needed (May 2020), Unsourced passages need footnotes {{citation needed}} (February 2022) |
| Fasciole | Low | Start | 1 | December 2024 | ... (December 2024) |
| Fauces (throat) | High | Start | 1 | July 2019 | ... (July 2019) |
| Flat bone | Low | Start | 1 | November 2010 | ... (November 2010) |
| Flipper (anatomy) | Mid | C | 1 | June 2008 | ... (June 2008) |
| Frenulum | Low | Start | 1 | March 2015 | ... (March 2015) |
| Frontal scale | Low | Stub | 1 | December 2009 | ... (December 2009) |
| Germ layer | High | C | 1 | September 2022 | ... (September 2022) |
| Gland | High | Start | 2 | April 2014 | Expansion needed (April 2014), ... (April 2024) |
| Gular skin | Low | Stub | 1 | May 2010 | ... (May 2010) |
| Hair | High | B | 5 | September 2010 | Unsourced passages need footnotes {{citation needed}} (September 2010, September 2016, November 2024), ... (August 2016), Pages with broken anchors (see article talk page, remove when fixed) |
| Hair cell | Mid | C | 2 | May 2013 | Unsourced passages need footnotes {{citation needed}} (May 2013), ... (September 2016) |
| Hindlimb | High | Start | 1 | March 2022 | ... (March 2022) |
| Horse hoof | Mid | B | 4 | July 2011 | ... (July 2011), Unsourced passages need footnotes {{citation needed}} (January 2017, June 2024), Introduction cleanup (November 2022) |
| Horse teeth | Mid | C | 2 | March 2007 | Unsourced passages need footnotes {{citation needed}} (March 2007), ... (September 2018) |
| Hypostome (tick) | Low | Stub | 1 | February 2022 | ... (February 2022) |
| Indumentum | Mid | Stub | 1 | October 2024 | ... (October 2024) |
| Insect mouthparts | Mid | Start | 3 | June 2018 | Page number citations needed (June 2018), ... (December 2023), Unsourced passages need footnotes {{citation needed}} (July 2025) |
| Interparietal bone | Low | Start | 1 | August 2013 | ... (August 2013) |
| Lacunal scales | Low | Stub | 1 | May 2014 | ... (May 2014) |
| Lavender (chicken plumage) | Low | C | 2 | November 2024 | ... (November 2024), Unsourced passages need footnotes {{citation needed}} (September 2025) |
| Ligament | Mid | Start | 3 | October 2010 | ... (October 2010), Unsourced passages need footnotes {{citation needed}} (November 2010, February 2017) |
| Limb (anatomy) | High | Start | 1 | January 2018 | ... (January 2018) |
| Loreal pit | Low | Stub | 1 | May 2014 | ... (May 2014) |
| Love dart | Mid | B | 5 | October 2008 | Unsourced passages need footnotes {{citation needed}} (October 2008), Accuracy disputes or self-published (July 2013), ... (March 2023), Weasel-worded phrases (January 2025), Cleanup needed (October 2025) |
| Lumbar | Low | Start | 1 | January 2017 | ... (January 2017) |
| Lunule (bivalve) | Low | Stub | 1 | June 2025 | ... (June 2025) |
| Lymphatic system | Mid | B | 3 | September 2010 | Dead external links {{dead link}} (September 2010), Off-topic sections (June 2019), ... (December 2024) |
| Male accessory gland | Low | C | 3 | September 2018 | ... (September 2018), Unsourced passages need footnotes {{citation needed}} (September 2021), Cites unreliable sources (March 2024) |
| Mammalian eye | Mid | C | 2 | June 2008 | ... (June 2008), Unsourced passages need footnotes {{citation needed}} (November 2025) |
| Mandible (arthropod mouthpart) | Mid | Start | 1 | December 2013 | ... (December 2013) |
| Mandible (insect mouthpart) | Mid | Start | 2 | September 2014 | ... (September 2014), Unsourced passages need footnotes {{citation needed}} (September 2020) |
| Mane (horse) | Low | B | 1 | September 2015 | ... (September 2015) |
| Maxilla | Mid | C | 2 | December 2007 | ... (December 2007), Unsourced passages need footnotes {{citation needed}} (January 2016) |
| Merle (dog coat) | Low | Start | 2 | September 2011 | ... (September 2011), Introduction cleanup (April 2012) |
| Mesoderm | Mid | C | 3 | June 2011 | Cites unreliable sources (June 2011), Dead external links {{dead link}} (January 2018), ... (May 2022) |
| Metathorax | Low | Stub | 1 | June 2024 | ... (June 2024) |
| Microvillus | Low | C | 2 | November 2016 | Dead external links {{dead link}} (November 2016), ... (March 2024) |
| Morphology of Diptera | Mid | C | 4 | January 2014 | Original research (January 2014), Has general references but lacks inline footnotes (January 2014), Clarification needed (August 2020), ... (August 2020) |
| Mucous gland | Low | Start | 1 | February 2020 | ... (February 2020) |
| Myofibroblast | Low | C | 1 | December 2010 | ... (December 2010) |
| Myomere | Mid | Stub | 6 | April 2025 | Cites unreliable sources (April 2025), ... (April 2025), Unsourced passages need footnotes {{citation needed}} (April 2025), Page number citations needed (April 2025), Style editing needed (April 2025), Clarification needed (June 2025) |
| Nasal mucosa | Low | Start | 1 | May 2010 | ... (May 2010) |
| Natalid organ | Low | Stub | 1 | December 2013 | ... (December 2013) |
| Neck frill | Low | Stub | 1 | December 2013 | ... (December 2013) |
| Nephrostome | Low | Stub | 1 | February 2023 | ... (February 2023) |
| Neuron | High | B | 2 | May 2018 | ... (May 2018), Unsourced passages need footnotes {{citation needed}} (July 2022) |
| Operculum (fish) | Mid | Start | 1 | February 2014 | ... (February 2014) |
| Oral arm | Mid | Start | 1 | February 2022 | ... (February 2022) |
| Ossicles | Mid | C | 2 | November 2017 | Clarification needed (November 2017), ... (December 2024) |
| Ovipositor | Mid | Start | 1 | October 2008 | ... (October 2008) |
| Paleoencephalon | Low | Stub | 1 | May 2015 | ... (May 2015) |
| Pallium (neuroanatomy) | Mid | Start | 1 | January 2025 | ... (January 2025) |
| Papula | Low | Stub | 1 | April 2025 | ... (April 2025) |
| Paramere | Low | Start | 2 | July 2025 | Unsourced passages need footnotes {{citation needed}} (July 2025), ... (July 2025) |
| Pastern | Low | Start | 1 | December 2021 | ... (December 2021) |
| Pecten (biology) | Low | Stub | 2 | July 2018 | ... (July 2018), Incomplete citations (July 2024) |
| Pharyngeal pouch (embryology) | Low | Start | 1 | April 2009 | ... (April 2009) |
| Pharynx | High | C | 1 | November 2015 | ... (November 2015) |
| Physiology of dinosaurs | Mid | B | 6 | September 2008 | ... (September 2008), Dead external links {{dead link}} (March 2018, February 2025), Unsourced passages need footnotes {{citation needed}} (May 2020), Pages with broken anchors (see article talk page, remove when fixed), Disputed statements (July 2023) |
| Piebald | Low | Start | 3 | November 2011 | ... (November 2011, February 2024), Unsourced passages need footnotes {{citation needed}} (September 2024) |
| Pituitary gland | Mid | C | 4 | September 2024 | Pages with broken anchors (see article talk page, remove when fixed), Unsourced passages need footnotes {{citation needed}} (September 2024), ... (November 2024), Dead external links {{dead link}} (April 2025) |
| Polypide | Low | Stub | 2 | February 2024 | Pages with broken anchors (see article talk page, remove when fixed), ... (February 2024) |
| Postdentary trough | Low | Stub | 1 | January 2021 | ... (January 2021) |
| Pouch (marsupial) | Low | Start | 4 | May 2015 | ... (May 2015, March 2024), Original research (March 2024), Clarification needed (November 2025) |
| Prehensility | Low | Start | 3 | December 2009 | ... (December 2009), Cleanup needed (October 2018), Prose needed (October 2018) |
| Protoconch | Mid | Stub | 1 | November 2020 | ... (November 2020) |
| Pulmocutaneous circulation | Low | Stub | 2 | February 2017 | Orphaned (February 2017), ... (June 2025) |
| Rectum | Mid | C | 4 | June 2009 | Unsourced passages need footnotes {{citation needed}} (June 2009, July 2020), Potentially dated statements (2014), ... (January 2022) |
| Rete mirabile | Mid | Start | 2 | February 2021 | ... (February 2021), Unsourced passages need footnotes {{citation needed}} (November 2021) |
| Reticular formation | Mid | C | 10 | November 2009 | Unsourced passages need footnotes {{citation needed}} (November 2009, February 2012, March 2017, September 2017, September 2021, May 2024, August 2024), Clarification needed (September 2019), ... (October 2019), CS1 errors: periodical ignored |
| Reticulorumen | Low | Stub | 2 | May 2015 | Unsourced passages need footnotes {{citation needed}} (May 2015), ... (August 2016) |
| Saefftigen's pouch | Low | Stub | 1 | March 2020 | ... (March 2020) |
| Scallop | Mid | B | 12 | January 2017 | Unsourced passages need footnotes {{citation needed}} (January 2017, March 2018, July 2024), Page number citations needed (January 2017), Cites unreliable sources (January 2017, April 2018, October 2020), CS1 errors: periodical ignored, CS1 errors: ISBN date, Cleanup needed (July 2025, July 2025), ... (July 2025) |
| Scopulae | Low | Stub | 1 | December 2009 | ... (December 2009) |
| Scutellum (insect anatomy) | Low | Stub | 1 | December 2009 | ... (December 2009) |
| Seashell | Mid | C | 5 | January 2009 | ... (January 2009, September 2011, July 2016, December 2017), Unsourced passages need footnotes {{citation needed}} (February 2011) |
| Sensory neuron | High | C | 4 | July 2014 | Dead external links {{dead link}} (July 2014), Unsourced passages need footnotes {{citation needed}} (March 2017), ... (September 2017), CS1 errors: periodical ignored |
| Septum (cephalopod) | Mid | Start | 1 | November 2012 | ... (November 2012) |
| Sex organ | High | C | 2 | August 2021 | Page number citations needed (August 2021), ... (August 2021) |
| Sexual bimaturism | Low | Stub | 1 | July 2015 | ... (July 2015) |
| Sexual dimorphism measures | Low | C | 4 | August 2021 | ... (August 2021), Has general references but lacks inline footnotes (August 2021), Style editing needed (July 2025), Clarification needed (November 2025) |
| Siphuncle | Mid | Start | 1 | December 2008 | ... (December 2008) |
| Skeletal muscle | High | B | 12 | August 2010 | Unsourced passages need footnotes {{citation needed}} (August 2010, December 2017, January 2021, May 2021, June 2021, October 2022), ... (March 2016, May 2021, June 2021), Dead external links {{dead link}} (April 2020, July 2022), Pages with broken anchors (see article talk page, remove when fixed) |
| Skeletal system of the horse | Mid | Start | 1 | February 2021 | ... (February 2021) |
| Solid white (chicken plumage) | Low | C | 2 | June 2014 | Has general references but lacks inline footnotes (June 2014), ... (November 2024) |
| Somatosensory system | Mid | C | 4 | February 2019 | Unsourced passages need footnotes {{citation needed}} (February 2019), Too technical (May 2021), Clarification needed (June 2023), ... (August 2023) |
| Spinal cord | High | C | 6 | December 2016 | Unsourced passages need footnotes {{citation needed}} (December 2016, December 2024), CS1 errors: periodical ignored, ... (January 2024), Page number citations needed (September 2024), Too technical (January 2025) |
| Spine (zoology) | Mid | Start | 2 | October 2024 | ... (October 2024), Unsourced passages need footnotes {{citation needed}} (August 2025) |
| Spiral valve | Low | Stub | 1 | August 2018 | ... (August 2018) |
| Spongocoel | Low | Stub | 1 | December 2009 | ... (December 2009) |
| Sternum | Mid | C | 3 | September 2015 | Unsourced passages need footnotes {{citation needed}} (September 2015, October 2015), ... (August 2024) |
| Stifle joint | Low | Stub | 1 | February 2024 | ... (February 2024) |
| Stylet (zoology) | Mid | Stub | 1 | November 2013 | ... (November 2013) |
| Stylophthalmine trait | Low | Stub | 1 | March 2025 | ... (March 2025) |
| Subcutaneous tissue | Mid | Start | 1 | December 2009 | ... (December 2009) |
| Supraesophageal ganglion | Mid | Stub | 1 | February 2016 | ... (February 2016) |
| Tail (horse) | Low | C | 3 | July 2011 | ... (July 2011), Reference errors, Potentially dated statements (2025) |
| Tarsometatarsus | Low | Start | 2 | May 2023 | ... (May 2023), Has general references but lacks inline footnotes (May 2023) |
| Tegmen | Low | Start | 1 | December 2009 | ... (December 2009) |
| Telomere (insect morphology) | Low | Stub | 2 | February 2015 | ... (February 2015), Unsourced passages need footnotes {{citation needed}} (December 2020) |
| Temple (anatomy) | Low | Start | 1 | July 2016 | ... (July 2016) |
| Terminal end bud | Low | Stub | 1 | June 2024 | ... (June 2024) |
| Testicle | Mid | B | 4 | May 2008 | Unsourced passages need footnotes {{citation needed}} (May 2008, July 2017), Page number citations needed (April 2022), ... (May 2025) |
| Tetrapod | Top | B | 1 | July 2015 | ... (July 2015) |
| Tissue (biology) | High | C | 2 | February 2019 | ... (February 2019), Unsourced passages need footnotes {{citation needed}} (August 2022) |
| Tongue | Mid | B | 4 | October 2022 | Page number citations needed (October 2022), ... (October 2022), Vague or ambiguous time (April 2024), CS1 errors: ISBN date |
| Torso | Low | Start | 1 | December 2024 | ... (December 2024) |
| Trabecula | Mid | C | 2 | May 2017 | ... (May 2017, March 2018) |
| Trabecular cartilage | Low | Start | 2 | August 2017 | Unsourced passages need footnotes {{citation needed}} (August 2017), ... (August 2017) |
| Tympanum (anatomy) | Mid | Stub | 1 | August 2018 | ... (August 2018) |
| Upper limb | Mid | C | 1 | July 2011 | ... (July 2011) |
| Valve (mollusc) | Mid | Start | 1 | August 2014 | ... (August 2014) |
| Vas deferens | Mid | C | 2 | March 2013 | ... (March 2013), Dead external links {{dead link}} (November 2015) |
| Vocal sac | Low | Start | 2 | October 2007 | Clarification needed (October 2007), ... (October 2025) |
| Withers | Low | Start | 1 | August 2020 | ... (August 2020) |
| Wolf tooth | Low | Start | 2 | December 2009 | ... (December 2009), Unsourced passages need footnotes {{citation needed}} (September 2024) |
| Yolk | Mid | C | 2 | July 2013 | Incomplete citations (July 2013), ... (May 2022) |
| Article | Importance | Class | Count | Oldest | Issues |
|---|---|---|---|---|---|
| Abdomen | High | C | 1 | July 2019 | ... (July 2019) |
| Abducens nerve | Low | C | 2 | December 2016 | ... (December 2016, November 2022) |
| Albinism | Mid | C | 3 | March 2021 | ... (March 2021), Unsourced passages need footnotes {{More citations needed}} (April 2023), Cites unreliable sources (November 2023) |
| Alula | Low | Start | 1 | April 2021 | ... (April 2021) |
| Amnion | Mid | Start | 2 | June 2021 | Unsourced passages need footnotes {{More citations needed}} (June 2021), ... (June 2024) |
| Amniotic sac | Mid | C | 3 | October 2020 | ... (October 2020, July 2021), Rewrite needed (September 2025) |
| Ampullary cupula | Low | Start | 1 | November 2011 | ... (November 2011) |
| Anatomical terms of bone | Mid | C | 1 | March 2014 | ... (March 2014) |
| Antler | Mid | C | 3 | April 2015 | ... (April 2015, November 2025), Incomplete citations (April 2015) |
| Aperture (mollusc) | Mid | Start | 1 | November 2021 | ... (November 2021) |
| Appendage | Mid | Start | 1 | August 2022 | ... (August 2022) |
| Aptery | Low | Stub | 1 | November 2025 | ... (November 2025) |
| Archaeocyte | Low | Stub | 1 | March 2021 | ... (March 2021) |
| Arthropod exoskeleton | Mid | C | 1 | May 2023 | ... (May 2023) |
| Arthropod eye | Mid | C | 2 | January 2015 | ... (January 2015), Unsourced passages need footnotes {{More citations needed}} (September 2025) |
| Arthropod leg | Mid | C | 7 | December 2017 | ... (December 2017, February 2025, March 2025), Unsourced passages need footnotes {{More citations needed}} (March 2025), Cleanup needed (May 2025, May 2025), Expansion needed (May 2025) |
| Auditory cortex | Mid | C | 3 | May 2014 | ... (May 2014, June 2023), CS1 errors: periodical ignored |
| Auditory system | High | C | 2 | April 2016 | Clarification needed (April 2016), ... (June 2022) |
| Axial skeleton | Mid | C | 1 | July 2023 | ... (July 2023) |
| Baleen | Low | Start | 3 | September 2022 | Clarification needed (September 2022), Unsourced passages need footnotes {{More citations needed}} (April 2025), ... (November 2025) |
| Bat wing development | Mid | C | 1 | October 2018 | ... (October 2018) |
| Bedburg-Königshoven (Mesolithic antler frontlets) | Low | Start | 2 | September 2023 | ... (September 2023), Clarification needed (October 2025) |
| Biomineralization | High | B | 2 | December 2020 | Potentially dated statements (December 2020), ... (May 2023) |
| Bird vision | Mid | B | 4 | December 2014 | ... (December 2014, September 2015, June 2021), Failed verification (August 2025) |
| Bladder | Mid | C | 2 | July 2020 | ... (July 2020), Dead external links {{dead link}} (February 2025) |
| Blowhole (anatomy) | Low | Stub | 1 | August 2021 | ... (August 2021) |
| Blue whale penis | Low | C | 1 | July 2013 | ... (July 2013) |
| Bone | High | C | 2 | September 2013 | ... (September 2013, September 2025) |
| Bone marrow | Mid | B | 1 | December 2021 | ... (December 2021) |
| Book lung | Mid | Start | 1 | April 2025 | ... (April 2025) |
| Callosity | Low | Stub | 2 | June 2010 | ... (June 2010, August 2014) |
| Cardiac muscle | Mid | B | 1 | May 2025 | ... (May 2025) |
| Carnassial | Low | Start | 1 | March 2021 | ... (March 2021) |
| Cat anatomy | High | C | 10 | August 2010 | Original research (August 2010, January 2025), Introduction cleanup (November 2018), Unsourced passages need footnotes {{More citations needed}} (August 2022), ... (March 2024), Dead external links {{dead link}} (January 2025), Factual verification needed (January 2025), Accuracy disputes or self-published (January 2025), Cites unreliable sources (January 2025), Page number citations needed (January 2025) |
| Cephalic index | Mid | Start | 2 | December 2021 | Unsourced passages need footnotes {{More citations needed}} (December 2021), ... (January 2025) |
| Cervical margins | Low | Stub | 1 | April 2025 | ... (April 2025) |
| Chemoreceptor | High | C | 2 | July 2010 | ... (July 2010, May 2015) |
| Chromatophore | High | B | 3 | March 2016 | ... (March 2016, February 2019), Dead external links {{dead link}} (February 2019) |
| Circulatory system | High | C | 4 | March 2015 | Expansion needed (March 2015), Dead external links {{dead link}} (August 2021), ... (February 2022, January 2025) |
| Circulatory system of gastropods | Mid | Start | 1 | November 2021 | ... (November 2021) |
| Circumesophageal nerve ring | Low | Start | 1 | May 2018 | ... (May 2018) |
| Clavicle | Mid | C | 2 | July 2009 | Unsourced passages need footnotes {{More citations needed}} (July 2009), ... (October 2024) |
| Coelom | High | C | 5 | February 2015 | ... (February 2015, November 2018, March 2021), Clarification needed (June 2018, March 2021) |
| Comb (anatomy) | Low | Start | 1 | December 2022 | ... (December 2022) |
| Comparative anatomy | Top | C | 1 | February 2018 | ... (February 2018) |
| Connective tissue | High | C | 1 | November 2022 | ... (November 2022) |
| Coral island | Low | Start | 1 | May 2023 | ... (May 2023) |
| Cribellum | Mid | C | 2 | November 2020 | Has general references but lacks inline footnotes (November 2020), ... (December 2020) |
| Cubital index | Low | Stub | 1 | November 2025 | ... (November 2025) |
| Dactyly | Mid | List | 2 | February 2010 | ... (February 2010, November 2021) |
| Decapod anatomy | High | C | 2 | April 2025 | Unsourced passages need footnotes {{More citations needed}} (April 2025), ... (May 2025) |
| Deep homology | Mid | Start | 1 | May 2023 | ... (May 2023) |
| Development of the nervous system | Mid | C | 2 | May 2020 | Page number citations needed (May 2020), ... (April 2025) |
| Dewclaw | Low | C | 1 | December 2018 | ... (December 2018) |
| Dewlap | Low | C | 2 | August 2011 | Has general references but lacks inline footnotes (August 2011), ... (November 2016) |
| Digestion | High | C | 4 | May 2011 | Detailed references needed, ... (May 2011), Expansion needed (August 2011), Unsourced passages need footnotes {{More citations needed}} (July 2022) |
| Dinosaur tooth | Low | B | 1 | December 2017 | ... (December 2017) |
| Dinosaur vision | Low | C | 3 | July 2016 | ... (July 2016, August 2021), Pages with broken anchors (see article talk page, remove when fixed) |
| Dog anatomy | High | B | 4 | September 2010 | Page number citations needed (September 2010), Unsourced passages need footnotes {{More citations needed}} (June 2015), Dead external links {{dead link}} (August 2025), ... (August 2025) |
| Down feather | Low | C | 1 | July 2022 | ... (July 2022) |
| Ear | Mid | GA | 1 | January 2023 | ... (January 2023) |
| Eardrum | Mid | C | 2 | July 2018 | ... (July 2018), Clarification needed (July 2018) |
| Egg cell | High | Start | 2 | October 2014 | ... (October 2014), Clarification needed (May 2021) |
| Eggshell | Mid | Start | 5 | March 2016 | Dead external links {{dead link}} (March 2016), ... (September 2017, July 2021), CS1 errors: missing title, CS1 errors: bare URL |
| Endocrine system | High | C | 1 | October 2025 | ... (October 2025) |
| Endostyle | Low | B | 2 | May 2025 | Page number citations needed (May 2025), ... (June 2025) |
| Enteric nervous system | Mid | C | 1 | January 2019 | ... (January 2019) |
| Epithelium | High | C | 5 | January 2011 | ... (January 2011, March 2016, September 2017, June 2019, April 2025) |
| Equine anatomy | High | B | 1 | August 2011 | ... (August 2011) |
| Equine conformation | Low | Start | 4 | November 2010 | Unsourced passages need footnotes {{More citations needed}} (November 2010), ... (November 2020), Cleanup needed (January 2024, January 2024) |
| Equine vision | Mid | C | 1 | October 2011 | ... (October 2011) |
| Esophagus | Mid | GA | 4 | 2014 | Potentially dated statements (2014, 2021), CS1 errors: ISBN date, ... (October 2025) |
| Evolution of nervous systems | High | C | 1 | August 2021 | ... (August 2021) |
| Excretory system | Top | C | 4 | April 2015 | Unsourced passages need footnotes {{More citations needed}} (April 2015), ... (May 2015, April 2024), Expansion needed (November 2017) |
| Exoskeleton | High | C | 4 | September 2020 | ... (September 2020, May 2023), Clarification needed (September 2020), CS1 errors: periodical ignored |
| Eye color | Low | C | 5 | 2006 | Potentially dated statements (2006, 2010), Unsourced passages need footnotes {{More citations needed}} (November 2012), Page number citations needed (May 2020), ... (February 2022) |
| First metacarpal bone | Low | C | 1 | November 2019 | ... (November 2019) |
| Fish anatomy | High | B | 5 | August 2020 | Detailed references needed, Clarification needed (August 2020), ... (August 2020), Factual verification needed (August 2020), Pages with broken anchors (see article talk page, remove when fixed) |
| Fish reproduction | Mid | C | 2 | August 2018 | ... (August 2018), Pages with broken anchors (see article talk page, remove when fixed) |
| Forked tongue | Low | Start | 2 | April 2018 | ... (April 2018, January 2020) |
| Frog (horse anatomy) | Low | Start | 2 | September 2021 | Page number citations needed (September 2021), ... (December 2023) |
| Fur | High | C | 2 | July 2023 | ... (July 2023), Introduction cleanup (July 2025) |
| Furstenberg's rosette | Low | Stub | 1 | October 2023 | ... (October 2023) |
| Ganglion | High | Start | 2 | February 2014 | ... (February 2014, April 2023) |
| Gastropod shell | Mid | C | 5 | December 2013 | Incomplete citations (December 2013), Page number citations needed (October 2020), ... (October 2020, May 2023), Dead external links {{dead link}} (May 2025) |
| Gastrulation | High | C | 1 | April 2022 | ... (April 2022) |
| Gecko feet | Low | C | 1 | November 2025 | ... (November 2025) |
| Gill slit | Low | Start | 2 | June 2023 | ... (June 2023), Weasel-worded phrases (June 2023) |
| Gizzard | Mid | Start | 2 | November 2021 | ... (November 2021), Page number citations needed (January 2025) |
| Glabrousness | Low | Start | 3 | February 2017 | ... (February 2017), Pages with broken anchors (see article talk page, remove when fixed), Weasel-worded phrases (July 2025) |
| Glochidium | Low | Start | 1 | July 2023 | ... (July 2023) |
| Gonad | High | Start | 5 | May 2012 | Cleanup needed (May 2012, May 2012), Expansion needed (September 2022), ... (September 2022, April 2025) |
| Gracility | Low | Start | 1 | July 2015 | ... (July 2015) |
| Guttural pouch | Mid | C | 1 | July 2020 | ... (July 2020) |
| Hair | High | B | 5 | September 2010 | ... (September 2010, September 2016, November 2024), Unsourced passages need footnotes {{More citations needed}} (August 2016), Pages with broken anchors (see article talk page, remove when fixed) |
| Hair cell | Mid | C | 2 | May 2013 | ... (May 2013), Unsourced passages need footnotes {{More citations needed}} (September 2016) |
| Heart | High | GA | 2 | October 2024 | ... (October 2024, November 2024) |
| Hemipenis | Low | Start | 1 | August 2021 | ... (August 2021) |
| Hide (skin) | Low | Start | 3 | April 2015 | ... (April 2015, April 2025), Incomplete citations (July 2020) |
| Horn (anatomy) | Mid | C | 2 | December 2007 | ... (December 2007), Clarification needed (March 2021) |
| Horse hoof | Mid | B | 4 | July 2011 | Unsourced passages need footnotes {{More citations needed}} (July 2011), ... (January 2017, June 2024), Introduction cleanup (November 2022) |
| Horse teeth | Mid | C | 2 | March 2007 | ... (March 2007), Unsourced passages need footnotes {{More citations needed}} (September 2018) |
| Humeral spine | Low | Stub | 2 | January 2013 | ... (January 2013, August 2022) |
| Hunter-Schreger band | Low | Start | 1 | January 2022 | ... (January 2022) |
| Hyaline cartilage | Low | C | 1 | October 2024 | ... (October 2024) |
| Hyoid bone | Mid | C | 5 | January 2014 | ... (January 2014, April 2022), Clarification needed (February 2022, September 2023), Pages with broken anchors (see article talk page, remove when fixed) |
| Hypothalamus | Mid | B | 4 | February 2013 | ... (February 2013, April 2016, September 2023, March 2025) |
| Ileum | Mid | C | 2 | June 2015 | Page number citations needed (June 2015), ... (September 2024) |
| Incisive foramen | Low | C | 1 | May 2022 | ... (May 2022) |
| Insect morphology | High | B | 4 | November 2017 | Dead external links {{dead link}} (November 2017), CS1 errors: missing periodical, CS1 errors: generic name, ... (December 2023) |
| Insect mouthparts | Mid | Start | 3 | June 2018 | Page number citations needed (June 2018), Unsourced passages need footnotes {{More citations needed}} (December 2023), ... (July 2025) |
| Insect wing | High | GA | 2 | October 2019 | ... (October 2019, August 2020) |
| Interdental plate | Low | Start | 1 | November 2023 | ... (November 2023) |
| Intervertebral disc | Mid | C | 1 | February 2018 | ... (February 2018) |
| Intromittent organ | High | Start | 2 | February 2013 | Has general references but lacks inline footnotes (February 2013), ... (September 2015) |
| Kidney | Mid | C | 3 | June 2022 | ... (June 2022, November 2023), CS1 errors: periodical ignored |
| Kinocilium | Low | C | 2 | April 2014 | Page number citations needed (April 2014), ... (December 2023) |
| Large intestine | Mid | C | 2 | March 2014 | ... (March 2014, September 2024) |
| Laurer's canal | Low | Stub | 1 | December 2019 | ... (December 2019) |
| Lavender (chicken plumage) | Low | C | 2 | November 2024 | Unsourced passages need footnotes {{More citations needed}} (November 2024), ... (September 2025) |
| Ligament | Mid | Start | 3 | October 2010 | Unsourced passages need footnotes {{More citations needed}} (October 2010), ... (November 2010, February 2017) |
| Limb development | Mid | C | 2 | August 2008 | ... (August 2008, May 2022) |
| Limbic system | Mid | C | 5 | June 2019 | Disputed statements (June 2019), ... (April 2020, January 2023, March 2023, November 2024) |
| Lira (mollusc) | Low | Stub | 1 | September 2025 | ... (September 2025) |
| List of animals by number of neurons | Low | List | 2 | June 2020 | Dead external links {{dead link}} (June 2020), ... (January 2024) |
| List of animals featuring external asymmetry | Low | List | 3 | April 2013 | Incomplete lists (April 2013), ... (February 2021), Weasel-worded phrases (February 2021) |
| Love dart | Mid | B | 5 | October 2008 | ... (October 2008), Accuracy disputes or self-published (July 2013), Unsourced passages need footnotes {{More citations needed}} (March 2023), Weasel-worded phrases (January 2025), Cleanup needed (October 2025) |
| Male accessory gland | Low | C | 3 | September 2018 | Unsourced passages need footnotes {{More citations needed}} (September 2018), ... (September 2021), Cites unreliable sources (March 2024) |
| Mammalian eye | Mid | C | 2 | June 2008 | Unsourced passages need footnotes {{More citations needed}} (June 2008), ... (November 2025) |
| Mammary gland | Mid | B | 1 | December 2017 | ... (December 2017) |
| Mandible | Mid | C | 3 | March 2017 | ... (March 2017, January 2024), Dead external links {{dead link}} (March 2020) |
| Mandible (insect mouthpart) | Mid | Start | 2 | September 2014 | Unsourced passages need footnotes {{More citations needed}} (September 2014), ... (September 2020) |
| Maxilla | Mid | C | 2 | December 2007 | Unsourced passages need footnotes {{More citations needed}} (December 2007), ... (January 2016) |
| Mechanoreceptor | Mid | Start | 1 | January 2025 | ... (January 2025) |
| Melanocyte | Mid | C | 1 | July 2025 | ... (July 2025) |
| Mentum | Mid | List | 1 | March 2025 | ... (March 2025) |
| Muscle | High | C | 3 | April 2014 | Page number citations needed (April 2014), ... (June 2021, May 2023) |
| Myomere | Mid | Stub | 6 | April 2025 | Cites unreliable sources (April 2025), Unsourced passages need footnotes {{More citations needed}} (April 2025), ... (April 2025), Page number citations needed (April 2025), Style editing needed (April 2025), Clarification needed (June 2025) |
| Nacre | Mid | B | 4 | March 2014 | ... (March 2014, December 2021, April 2025), Dead external links {{dead link}} (July 2025) |
| Nail (anatomy) | Low | C | 7 | July 2007 | ... (July 2007, February 2021, November 2021, October 2022, November 2025), Page number citations needed (June 2021), Dead external links {{dead link}} (September 2023) |
| Nasal concha | Mid | C | 1 | January 2015 | ... (January 2015) |
| Neuron | High | B | 2 | May 2018 | Unsourced passages need footnotes {{More citations needed}} (May 2018), ... (July 2022) |
| Nipple | Low | C | 2 | September 2021 | Cites unreliable sources (September 2021), ... (November 2021) |
| Notochord | High | C | 3 | January 2011 | ... (January 2011), Too technical (February 2017), Cites unreliable sources (September 2022) |
| Notum | Low | Stub | 2 | January 2025 | ... (January 2025), Page number citations needed (March 2025) |
| Olfactory bulb | Mid | C | 4 | December 2013 | Potentially dated statements (2013), ... (December 2013, March 2017, November 2020) |
| Operculum (gastropod) | Mid | Start | 1 | January 2021 | ... (January 2021) |
| Opisthosoma | Mid | Start | 1 | September 2025 | ... (September 2025) |
| Organ (biology) | Top | C | 5 | May 2015 | Page number citations needed (May 2015), ... (February 2018, May 2021, August 2021), Expansion needed (February 2018) |
| Osphradium | Low | Stub | 2 | May 2025 | Page number citations needed (May 2025), ... (May 2025) |
| Osteoblast | Mid | C | 3 | October 2019 | Page number citations needed (October 2019), ... (May 2023), CS1 errors: ISBN date |
| Otolith | Mid | B | 3 | February 2016 | ... (February 2016), Too technical (March 2021), Dead external links {{dead link}} (May 2025) |
| Ovary | Mid | C | 2 | November 2017 | ... (November 2017, July 2023) |
| Paramere | Low | Start | 2 | July 2025 | ... (July 2025), Unsourced passages need footnotes {{More citations needed}} (July 2025) |
| Parenchyma | Mid | Start | 1 | August 2023 | ... (August 2023) |
| Patagium | Mid | C | 2 | July 2020 | ... (July 2020), Page number citations needed (December 2021) |
| Pedipalp | Low | C | 3 | February 2016 | Weasel-worded phrases (February 2016), ... (November 2019), Pages with broken anchors (see article talk page, remove when fixed) |
| Pelvic fin | Low | Start | 1 | April 2021 | ... (April 2021) |
| Penis | High | C | 7 | June 2013 | Dead external links {{dead link}} (June 2013), Reorganization needed (June 2013), ... (December 2013), Potentially dated statements (2015), CS1 errors: missing periodical, Accuracy disputes or self-published (February 2020), CS1 errors: ISBN date |
| Phalanx bone | Mid | C | 5 | January 2014 | Expansion needed (January 2014), Too technical (January 2014), Harv and Sfn no-target errors, ... (November 2021), CS1 errors: ISBN date |
| Pharyngeal slit | Mid | Start | 3 | June 2023 | CS1 errors: missing periodical, ... (June 2023), Weasel-worded phrases (June 2023) |
| Philtrum | Low | Start | 1 | February 2023 | ... (February 2023) |
| Photophore | Mid | Start | 2 | March 2025 | Accuracy disputes or self-published (March 2025), ... (June 2025) |
| Photoreceptor cell | Mid | C | 1 | September 2025 | ... (September 2025) |
| Physiology of dinosaurs | Mid | B | 6 | September 2008 | Unsourced passages need footnotes {{More citations needed}} (September 2008), Dead external links {{dead link}} (March 2018, February 2025), ... (May 2020), Pages with broken anchors (see article talk page, remove when fixed), Disputed statements (July 2023) |
| Piebald | Low | Start | 3 | November 2011 | Unsourced passages need footnotes {{More citations needed}} (November 2011, February 2024), ... (September 2024) |
| Pineal gland | Low | B | 2 | March 2023 | ... (March 2023, November 2025) |
| Pituitary gland | Mid | C | 4 | September 2024 | Pages with broken anchors (see article talk page, remove when fixed), ... (September 2024), Unsourced passages need footnotes {{More citations needed}} (November 2024), Dead external links {{dead link}} (April 2025) |
| Placenta | Mid | C | 3 | January 2021 | ... (January 2021, September 2023), Page number citations needed (August 2021) |
| Postorbital bar | Low | Stub | 1 | September 2017 | ... (September 2017) |
| Prostate | Low | GA | 1 | January 2022 | ... (January 2022) |
| Pseudo-penis | Low | Start | 4 | May 2017 | Failed verification (May 2017), ... (May 2019), Accuracy disputes or self-published (December 2019), Harv and Sfn no-target errors |
| Pygostyle | Low | Start | 1 | February 2012 | ... (February 2012) |
| Quadrate bone | Mid | Start | 1 | April 2020 | ... (April 2020) |
| Rachis | Low | Stub | 1 | June 2021 | ... (June 2021) |
| Rectum | Mid | C | 4 | June 2009 | ... (June 2009, July 2020), Potentially dated statements (2014), Unsourced passages need footnotes {{More citations needed}} (January 2022) |
| Reproductive system of gastropods | Mid | Start | 3 | February 2023 | Broken or outdated citations (February 2023), ... (February 2023), Dead external links {{dead link}} (September 2023) |
| Reptile scale | Mid | C | 1 | August 2015 | ... (August 2015) |
| Respiratory system | Top | B | 3 | September 2010 | Page number citations needed (September 2010), ... (December 2023, September 2025) |
| Rete mirabile | Mid | Start | 2 | February 2021 | Unsourced passages need footnotes {{More citations needed}} (February 2021), ... (November 2021) |
| Reticular formation | Mid | C | 10 | November 2009 | ... (November 2009, February 2012, March 2017, September 2017, September 2021, May 2024, August 2024), Clarification needed (September 2019), Unsourced passages need footnotes {{More citations needed}} (October 2019), CS1 errors: periodical ignored |
| Reticulorumen | Low | Stub | 2 | May 2015 | ... (May 2015), Unsourced passages need footnotes {{More citations needed}} (August 2016) |
| Rostrum (anatomy) | Low | Start | 1 | October 2025 | ... (October 2025) |
| Salt gland | Mid | Start | 1 | September 2011 | ... (September 2011) |
| Scallop | Mid | B | 12 | January 2017 | ... (January 2017, March 2018, July 2024), Page number citations needed (January 2017), Cites unreliable sources (January 2017, April 2018, October 2020), CS1 errors: periodical ignored, CS1 errors: ISBN date, Cleanup needed (July 2025, July 2025), Unsourced passages need footnotes {{More citations needed}} (July 2025) |
| Scleral ring | Low | C | 1 | October 2025 | ... (October 2025) |
| Scolopidia | Low | Start | 1 | March 2025 | ... (March 2025) |
| Scute | Mid | Start | 1 | August 2015 | ... (August 2015) |
| Seashell | Mid | C | 5 | January 2009 | Unsourced passages need footnotes {{More citations needed}} (January 2009, September 2011, July 2016, December 2017), ... (February 2011) |
| Sense of smell | High | C | 3 | February 2021 | ... (February 2021, March 2021), CS1 errors: ISBN date |
| Sensory nervous system | Top | C | 5 | May 2019 | Clarification needed (May 2019), Off-topic sections (May 2019), Pages with broken anchors (see article talk page, remove when fixed), ... (November 2024), Page number citations needed (November 2024) |
| Sensory neuron | High | C | 4 | July 2014 | Dead external links {{dead link}} (July 2014), ... (March 2017), Unsourced passages need footnotes {{More citations needed}} (September 2017), CS1 errors: periodical ignored |
| Sensory systems in fish | Mid | C | 1 | February 2024 | ... (February 2024) |
| Sexual dimorphism | High | B | 8 | October 2016 | Disputed statements (October 2016), Clarification needed (July 2018), ... (August 2018, August 2021, November 2021, May 2022), Page number citations needed (August 2021), Cites unreliable sources (August 2021) |
| Sexual dimorphism in dinosaurs | Mid | Start | 1 | August 2018 | ... (August 2018) |
| Sexual reproduction | High | C | 3 | December 2023 | Failed verification (December 2023), ... (August 2025), Introduction cleanup (August 2025) |
| Sexually dimorphic nucleus | Low | C | 1 | May 2022 | ... (May 2022) |
| Shark anatomy | High | Start | 1 | September 2024 | ... (September 2024) |
| Skeletal muscle | High | B | 12 | August 2010 | ... (August 2010, December 2017, January 2021, May 2021, June 2021, October 2022), Unsourced passages need footnotes {{More citations needed}} (March 2016, May 2021, June 2021), Dead external links {{dead link}} (April 2020, July 2022), Pages with broken anchors (see article talk page, remove when fixed) |
| Skeleton | Top | C | 2 | August 2021 | ... (August 2021), Page number citations needed (August 2021) |
| Skull | Mid | C | 2 | December 2018 | ... (December 2018), Cites unreliable sources (November 2022) |
| Skulls Unlimited International | Low | Start | 1 | January 2025 | ... (January 2025) |
| Small intestine | Mid | C | 2 | May 2022 | CS1 errors: generic name, ... (May 2022) |
| Smooth muscle | High | C | 1 | November 2017 | ... (November 2017) |
| Snake scale | Mid | GA | 1 | May 2024 | ... (May 2024) |
| Somatosensory system | Mid | C | 4 | February 2019 | ... (February 2019), Too technical (May 2021), Clarification needed (June 2023), Unsourced passages need footnotes {{More citations needed}} (August 2023) |
| Somite | Mid | C | 1 | November 2014 | ... (November 2014) |
| Special senses | Mid | C | 1 | November 2016 | ... (November 2016) |
| Spider silk | Mid | B | 5 | May 2013 | ... (May 2013, January 2024, July 2025), Page number citations needed (September 2013), Factual verification needed (June 2018) |
| Spinal cord | High | C | 6 | December 2016 | ... (December 2016, December 2024), CS1 errors: periodical ignored, Unsourced passages need footnotes {{More citations needed}} (January 2024), Page number citations needed (September 2024), Too technical (January 2025) |
| Spine (zoology) | Mid | Start | 2 | October 2024 | Unsourced passages need footnotes {{More citations needed}} (October 2024), ... (August 2025) |
| Stabilimentum | Low | Start | 3 | April 2009 | Cites unreliable sources (April 2009), ... (November 2019, April 2022) |
| Statocyst | Mid | Start | 1 | June 2022 | ... (June 2022) |
| Stem cell | Mid | B | 4 | 2016 | Potentially dated statements (2016), Page number citations needed (January 2019, August 2021), ... (August 2021) |
| Sternum | Mid | C | 3 | September 2015 | ... (September 2015, October 2015), Unsourced passages need footnotes {{More citations needed}} (August 2024) |
| Stomach | High | C | 2 | October 2019 | ... (October 2019, May 2020) |
| Subgenual organ | Low | Start | 1 | November 2019 | ... (November 2019) |
| Surangular | Low | Stub | 1 | May 2025 | ... (May 2025) |
| Surface anatomy | High | C | 1 | June 2012 | ... (June 2012) |
| Tadpole pupil | Low | Start | 1 | October 2025 | ... (October 2025) |
| Tail club | Low | Stub | 1 | December 2021 | ... (December 2021) |
| Tapetum lucidum | Mid | Start | 2 | January 2021 | Disputed statements (January 2021), ... (August 2024) |
| Telomere (insect morphology) | Low | Stub | 2 | February 2015 | Unsourced passages need footnotes {{More citations needed}} (February 2015), ... (December 2020) |
| Tendon | High | C | 2 | May 2023 | Clarification needed (May 2023), ... (September 2025) |
| Testicle | Mid | B | 4 | May 2008 | ... (May 2008, July 2017), Page number citations needed (April 2022), Unsourced passages need footnotes {{More citations needed}} (May 2025) |
| Thoracic diaphragm | High | C | 5 | August 2011 | Accuracy disputes or self-published (August 2011), ... (May 2013, April 2022), Incomplete citations (June 2020), CS1 errors: missing title |
| Thorax | Mid | C | 1 | May 2022 | ... (May 2022) |
| Thyroid | Mid | GA | 1 | September 2011 | ... (September 2011) |
| Tissue (biology) | High | C | 2 | February 2019 | Unsourced passages need footnotes {{More citations needed}} (February 2019), ... (August 2022) |
| Toco toucan beak | Low | C | 1 | March 2025 | ... (March 2025) |
| Trabecular cartilage | Low | Start | 2 | August 2017 | ... (August 2017), Unsourced passages need footnotes {{More citations needed}} (August 2017) |
| Trophic egg | Mid | C | 1 | April 2025 | ... (April 2025) |
| Trophosome | Low | Start | 1 | January 2025 | ... (January 2025) |
| Tubercle | Low | Start | 2 | November 2013 | ... (November 2013, November 2024) |
| Turkey (bird) | Low | C | 3 | December 2016 | ... (December 2016, January 2021, May 2022) |
| Urethra | Mid | C | 1 | July 2020 | ... (July 2020) |
| Vergence | Low | C | 2 | January 2011 | ... (January 2011), Cites unreliable sources (September 2019) |
| Vertebra | High | C | 3 | January 2020 | ... (January 2020), Incomplete citations (July 2020), Dead external links {{dead link}} (August 2025) |
| Vestibular system | Mid | C | 2 | March 2017 | ... (March 2017, May 2022) |
| Visual system | High | C | 2 | September 2024 | Clarification needed (September 2024), ... (November 2025) |
| Whiskers | Mid | C | 3 | April 2021 | Too technical (April 2021), Incomplete citations (March 2022), ... (March 2024) |
| Wing | Low | C | 2 | April 2017 | ... (April 2017, January 2025) |
| Wingspan | Mid | C | 1 | February 2009 | ... (February 2009) |
| Wolf tooth | Low | Start | 2 | December 2009 | Unsourced passages need footnotes {{More citations needed}} (December 2009), ... (September 2024) |
| Zona pellucida | Low | Start | 2 | August 2011 | Factual verification needed (August 2011), ... (May 2024) |
| Zygote | High | Start | 2 | March 2024 | ... (March 2024, March 2025) |