The Echinoid Directory

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Triadocidaris subsimilis (Munster, 1841); St Cassian Formation, Carnian, Upper Triassic, St Cassian, Italy. From Kier, P.M. 1977. Triassic echinoids. Smithsonian Contributions to Paleobiology 30, 1-88 (pl. 4, fig. 5). Lateral view.

Diameter of test 25 mm.