The Echinoid Directory

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Lenticidaris utahensis Kier, 1968; Scythian, Lower Triassic, St George, Utah, USA. From Kier, P.M. 1968. The Triassic echinoids of North America. Journal of Paleontology 42, 1000-1006. Details of interambulacral (left) and ambulacral (right) plating.