Pawson, David L Department of Invertebrate Zoology, Smithsonian Institution, Washington, DC.
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An order of sea urchins (phylum Echinodermata, class Echinoidea) with a camarodont lantern (feeding and locomotor apparatus) bearing keeled teeth that are T-shaped in cross section, and with epiphyses enlarged and connected to each other in a continuous arc. The surface of the test in Temnopleuroida is usually sculptured with ridges (epistroma) or sutural depressions (Fig. 1), or both. The primary tubercles are usually crenulate. The order includes a long phylogenetic series in which the original characters change considerably, so a concise but exact diagnosis is sometimes not possible. See also: Echinodermata; Echinoidea
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