Back كيسانيات Arabic سيستويديات ARZ Dəniz qovuqları Azerbaijani Cistoïdeus Catalan Beutelstrahler German Cystoidea Spanish Tsüstiidid Estonian کیسهواران Persian Cystoidea Finnish Cystoidea French
| Cystoidea Temporal range:
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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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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.