单词 | Cystoidea |
释义 | Cystoideaplural noun Cys·toid·ea siˈstȯidēə : a class of Paleozoic short-stemmed or stemless pelmatozoan echinoderms formerly considered an order of Crinoidea having the body commonly somewhat globular or egg-shaped and enclosed in calcareous plates that are usually pierced by a system of pores possibly respiratory in function |
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