Talk:Sand dollar

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Contradiction
Is it a skeleton or is it an animal?

195.194huiti76rfo76t7650 17:00, 23 January 2006 (UTC)


 * Both, but starting the discussion with the skeleton is wrong. I see no reason to have the sentence about one species being maroon either.  That's like starting a page on vertebrates with a comment on yellow-bellied sapsuckers.  Consider both fixed. --205.160.180.136 13:19, 13 April 2006 (UTC)

It would classify more as a rock since it is made out of sand and is not a living being. — Preceding unsigned comment added by Dpcole (talk • contribs) 18:38, 2021 September 4 (UTC)

doves?
Some info about the "doves" would be nice. I have some pictures here: []. Apparently they form the equivalent of a jaw. --CTho 02:52, 5 August 2006 (UTC) In a living sand dollar, the five "doves" fit together to form a star-shaped structure called the Aristotle's Lantern. The doves are joined by muscles that contract to bring the pieces closer together to crush sand grains. Each dove has a tooth that bisects the structure.

Please don't merge!!!
Please don't merge!! It is like merging Mallard with Duck!! :o --HoopoeBaijiKite 21:00, 18 June 2007 (UTC)
 * I agree, I've removed the template from both pages. The request was made by an anon user anyway. Jack 17:59, 22 July 2007 (UTC)

Pansy shell redirect
I've made a redirect page of Pansy shell to here. I hope I'm right in assuming that they are the same thing. I know Pansy shell may not be recognised as a proper name for them, but tourist areas of Southern Africa like to call them that. Jack 17:56, 22 July 2007 (UTC)

Information on Paleozoic/Mesozoic Sand Dollars
Do we have references or even genus names of the Silurian sand dollars? I can not find anything about "Silurian sand dollars" beyond whatever the mirror systems are copying from the wikipedia article. All of my sources tell me that the first sand dollars diverged from the sea urchins during the Eocene Cenomanian Epoch of the Cretaceous.--Mr Fink (talk) 22:43, 3 May 2009 (UTC)

Bad Link
Who is the * who inadvertently linked "podia" to the article on podiums (singular of one definition of "podia")??? People, check where links will go to before you write them in! —Preceding unsigned comment added by 98.232.230.111 (talk) 00:30, 1 October 2009 (UTC)

Sea Biscuit
Sea Biscuit, the Clypeaster rosaceus seems to have been lumped in here. Is this article about the whole Clypeasteroida order, of which Sand Dollars are one family member? Group29 (talk) 02:04, 28 December 2009 (UTC)

External links modified
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 * Added archive https://web.archive.org/web/20071010021603/http://www.mbayaq.org/efc/living_species/default.asp?hOri=0&hab=7&inhab=143 to http://www.mbayaq.org/efc/living_species/default.asp?hOri=0&hab=7&inhab=143
 * Added archive https://web.archive.org/web/20110927103724/http://www.gma.org/tidings/sanddollar.html to http://www.gma.org/tidings/sanddollar.html
 * Added archive https://web.archive.org/web/20110727162300/http://palaeontology.palass-pubs.org/pdf/Vol%2025/Pages%201-9.pdf to http://palaeontology.palass-pubs.org/pdf/Vol%2025/Pages%201-9.pdf

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Habitat Inaccurate or Misleading?
Hey, I've never added to Wikipedia so Im hoping someone else can help translate this info to the wiki, but I think the habitat range given is wrong? I'm pretty sure sand dollars live further north than the eastern US? Dendraster excentricus is at least one example of a species that lives faarther north (src https://www.centralcoastbiodiversity.org/eccentric-sand-dollar-bull-dendraster-excentricus.html, and also info provided in the Vancouver and Seattle aquariums, and https://en.m.wikipedia.org/wiki/Dendraster_excentricus). Also if Im reading this study correctly (https://scholarworks.calstate.edu/downloads/rj430940h), sand dollar distribution across the north pacific at least is in patches across sandy bottom areas in most temperature zones. I couldn't find much of anything about arctic or antarctic sand dollars, but otherwise they seem to be nearly global. Thoughts? Am I missing something? — Preceding unsigned comment added by 2001:569:F82E:B500:10C7:31F8:96BD:A586 (talk) 01:04, 4 January 2023 (UTC)
 * You are perfectly right, this information was only about one species, not the group : I removed it. Cheers, FredD (talk) 09:00, 4 January 2023 (UTC)

Taxonomic update
There has been a massive taxonomic update about irregular sea urchins : Most "sand dollars" now belong to Scutelloida, opposed to "sea biscuits" Clypeasteroida. However, most sea biscuits are still flat, except the "tru" sea biscuits (genus Clypeaster). Hence, "Sand dollar" should redirect either to Neognathostomata (containing all groups) either to Scutelloida (excluding sea biscuits and some other inflated groups, but also the flat sea biscuits). Some people might also want to redirect it to Scutellidea, tue superfamily containing American sand dollars (Mellitidae + Dendraster) as the name is mostly American (for example in French they are mostly named "flat urchins").
 * Mongiardino Koch, N., Thompson, J.R., Hiley, A.S., McCowin, M.F., Armstrong, A.F., Coppard, S.E., Aguilera, F., Bronstein, O., Kroh, A., Mooi, R. & Rouse, G.W., « Phylogenomic analyses of echinoid diversification prompt a re-evaluation of their fossil record », eLife,‎ 2022 (DOI 10.7554/eLife.72460).

I already updated it in the French version, good luck for fixing it here too.

Cheers,

FredD (talk) 09:00, 4 January 2023 (UTC)