Cystoidea
plural noun
Cys·toid·ea
| \ siˈstȯidēə\
Definition of Cystoidea
: 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
Keep scrolling for more