Echinoids from the triassic st cassian of italy their lantern supports and a revised phylogeny of triassic echinoids

Kier, P.M.

Smithsonian Contributions to Paleobiology 56: 1-14


Accession: 005208065

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Three new species of Triassic echinoids are described from the St. Cassian (Karnian) beds of Cortina d'Ampezzo, Italy: Levicidaris furlani, L. pfaifferi and Zardinechinus giulinii. Hundreds of echinoid fragments from the same beds show that 16 spp. lack apophyses (interambulacral lantern supports) and 7 possess them. Previously, paleontologists assumed that most Triassic echinoids had apophyses. Their absence from so many species and the presence of slightly developed auricles (ambulacral lantern supports) suggest that 2 echinoid lineages crossed from the Paleozoic to the Triassic: 1, possessing apophyses, is ancestral to all modern cidaroids; a 2nd, lacking apophyses, gave rise to all noncidaroid echinoids.