Spatangina

plural noun

Spat·​an·​gi·​na

ˌspatᵊnˈjīnə,

-jēnə

: a suborder of sea urchins (order Exocyloida) comprising numerous more or less flattened approximately heart-shaped sea urchins that exhibit considerable secondary bilateral symmetry compare clypeastrina

Word History

Etymology

New Latin, from Spatangus + -ina

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