The Echinoid Directory

Aplocidaris helenae (de Regny, 1904); holotype - Istituto di Geologia e Paleontologia, Universita di Bologna Calacre Rosso, Norian, Upper Triassic of Montenegro.  Test in side view, from Kier, P. M. Triassic Echinoids. Smithsonian Contributions to Paleobiology 30, 1-88, (pl. 21, fig. 12).

Diameter of test 7 mm.