Cystoidea
Cystoidea is a class of extinct crinozoan echinoderms, termed cystoids, that lived attached to the sea floor by stalks. They existed during the Paleozoic Era, in the Middle Ordovician and Silurian Periods, until their extinction in the Devonian Period.
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| "Cystoidea" from Ernst Haeckel's Kunstformen der Natur, 1904 | |
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| Class: | †Cystoidea von Buch 1846 |
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