Centrechinoida

plural noun

Cen·​trech·​i·​noi·​da

(ˌ)sen‧ˌtrekə̇ˈnȯidə

: a large order of sea urchins having peristomial gills, sphaeridia, and an apically located anus compare cidaroida , exocycloida

Word History

Etymology

New Latin, from Centrechinus + -oida

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