Fell, Howard B. Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts.
A superorder of Echinoidea, subclass Euechinoidea. These invertebrates are characterized by having a rigid, exocyclic test and a lantern or jaw apparatus developed sometime during the life history and usually persisting into the adult stage. The included orders are the Clypeasteroida, Cassiduloida, Neolampadoida, and Oligopygoida. See also: Echinodermata; Echinoidea; Euechinoidea; Holectypoida; Neolampadoida; Oligopygoida
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