mbarco Posted December 17, 2022 Share Posted December 17, 2022 I was watching an online seminar: Pal(a)eoPercs - Sarah Sheffield https://youtu.be/rohOQbEirAQ When, about at 11.54, she says that some Diploporitans lack diplopore (i.e. Amphoracystis) and some non-diploporitan echinoderms have diplopores (i.e. some edrioasteroid). So, which are the Diploporita distinctive features ? In order to tell: "Alright, this specimen belongs to the Diploporita class" Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted December 17, 2022 Share Posted December 17, 2022 (edited) You can't. The Diploporita is almost certainly polyphyletic, back in the day any stemmed echinoderm with diplopores was lumped in here and the group has never been properly revised. It seems that diplopores evolved separately several times in early echinoderms. Edited December 17, 2022 by Tidgy's Dad 1 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
mbarco Posted December 17, 2022 Author Share Posted December 17, 2022 Ok, now I understand, thanks a lot Link to comment Share on other sites More sharing options...
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