Talk:Sea urchin

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Sea urchin has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.

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Date	Process	Result
June 2, 2018	Good article nominee	Listed

A fact from this article appeared on Wikipedia's Main Page in the "Did you know?" column on June 19, 2018.

The text of the entry was: Did you know ... that sea urchins can go bald?

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animals that eat urchins in lead Too regional[edit]

The lead lists sea otters, wolf eels and triggerfish as Main predators Of sea urchin. I’m pretty sure this was sourced from somewhere talking only about sea urchins in the northeast pacific probably California. Since this is the article on urchins as a whole not just the those on the west coast of North America I’m going to loosen the language a bit 75.142.22.164 (talk) 19:44, 18 August 2022 (UTC)[reply]

Sea urchin[edit]

characteristic 103.167.233.7 (talk) 01:34, 1 December 2022 (UTC)[reply]

Musclo-skelatal intro paragraph is too "chummy"[edit]

The first paragraph is very chatty and not well written

> Sea urchins might appear to be incapable of moving but this is a false impression. [Really? you're assuming a lot about what I think] In some cases, [which cases specifically are you talking about and which are you not?] the most visible sign of life is the spines, which are attached to ball-and-socket joints [they are NOT ball and socket joints] and can point in any direction; in most urchins, touch elicits a prompt reaction from the spines, which converge toward the touched point. [this is NOT related to them moving, but is more a defence mechanism - so put it in a different paragraph.] Sea urchins have no visible eyes, legs, or means of propulsion, [chatty, do they have invisible eyes?] but can move freely but slowly over hard surfaces using adhesive tube feet, working in conjunction with the spines. [is this not a means of propulsion?]

Some of the spines are 6 inches long. Do you mean to say that the tube-feet can extend that long to reach past the spines and move the urchin? Lehasa (talk) 15:40, 28 December 2022 (UTC)[reply]

I've fixed it up now.

Various resources I've found are listed below. Perhaps they'll be useful for anyone who wants to improve things more.

http://www.chalk.discoveringfossils.co.uk/CIDAROID_terminology.htm

https://ns-echinodermata.linnaeus.naturalis.nl/linnaeus_ng/app/views/introduction/topic.php?id=2845

https://cronodon.com/BioTech/echinoids.html

http://animaldiversity.org/site/accounts/information/Echinoidea.html

https://www.nhm.ac.uk/our-science/data/echinoid-directory/morphology/regulars/intro.html Lehasa (talk) 20:23, 28 December 2022 (UTC)[reply]

female sea urchins[edit]

Reproduction only talks about male sea urchins. What about females? It does say there are clear male female sea urchins. Cowcatmom (talk) 17:13, 21 August 2023 (UTC)[reply]