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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]
characteristic 103.167.233.7 (talk) 01:34, 1 December 2022 (UTC)[reply]
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]
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]
Hello! This is to let editors know that File:Tripneustes ventricosus_(West_Indian_Sea_Egg-top)_and_Echinometra_viridis_(Reef_Urchin_-_bottom).jpg, a featured picture used in this article, has been selected as the English Wikipedia's picture of the day (POTD) for May 18, 2024. A preview of the POTD is displayed below and can be edited at Template:POTD/2024-05-18. For the greater benefit of readers, any potential improvements or maintenance that could benefit the quality of this article should be done before its scheduled appearance on the Main Page. If you have any concerns, please place a message at Wikipedia talk:Picture of the day. Thank you! — Amakuru (talk) 17:02, 10 May 2024 (UTC)[reply]
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Sea urchins are a group of spiny globular echinoderms which form the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to 5,000 metres (16,000 feet; 2,700 fathoms). Their tests (hard shells) are round and spiny, typically from 3 to 10 centimetres (1 to 4 inches) across. Sea urchins move slowly, crawling with their tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae but also eat slow-moving or sessile animals. Their predators include sea otters, starfish, wolf eels, and triggerfish. This photograph, taken off the northern coast of Haiti near Cap-Haïtien, shows two species of sea urchin: a West Indian sea egg (top) and a reef urchin (bottom). Photograph credit: Nick Hobgood, edited by Lycaon
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