SINCE 1828
Centrechinoida
plural noun
Cen·trech·i·noi·da
| \(ˌ)sen‧ˌtrekə̇ˈnȯidə\
Definition of Centrechinoida
: a large order of sea urchins having peristomial gills, sphaeridia, and an apically located anus — compare cidaroida , exocycloida
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