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Order Clypeasteroida Agassiz 1836 (sand dollar)

Echinoidea

Full reference: L. Agassiz. 1836. Prodrome d'une monographie des radiaires ou échinodermes. Mémoires de la Société des Sciences Naturelles de Neuchâtel 1:168-199

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

Sister taxa: Apatopygidae, Archiaciidae, Bothryopneustes, Cassiduloida, Clypeidae, Clypeolampadidae, Echinolampadoida, Nucleolitidae, Pygaulidae

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

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Ecology: slow-moving semi-infaunal detritivore