Clypeastrina
plural noun
Clyp·e·as·tri·na
| \ -əˈstrīnə, -rēnə\
Definition of Clypeastrina
: a suborder of sea urchins (order Exocycloida) comprising a large number of flattened more or less discoidal sea urchins (as the cake urchins and sand dollars) — compare spatangina
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