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Suborder Clypeasterina Agassiz 1872 (sand dollar)

Echinoidea - Clypeasteroida

Alternative spelling: Clypeasteridae

Full reference: A. Agassiz. 1872. Revision of the Echini. Memoirs of the Museum of Comparative Zoology at Harvard College 3:1-378

Parent taxon: Clypeasteroida according to A. Kroh and A. B. Smith 2010

Sister taxa: Botriopygus, Conoclypeidae, Cossmannaster, Durhamella, Faujasiidae, Hesperaster, Laganina, Leniechinus, Lenita, Oligopygidae, Pentedium, Plesiolampadidae, Proescutella, Prowillungaster, Rotulina, Runa, Scutellina, Scutellina, Tournoueraster, Willungaster

Subtaxa: Clypeasteridae, Fossulasteridae

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Ecology: slow-moving semi-infaunal detritivore