Title
Echinoids from the Triassic (St. Cassian) of Italy, their lantern supports, and a revised phylogeny of Triassic echinoids
Related Titles
Series:
Smithsonian contributions to paleobiology, no. 56
By
Kier, Porter M.
Smithsonian Institution. Press
Type
Book
Material
Published material
Publication info
Washington, Smithsonian Institution Press, 1984
Notes
Distributed to depository libraries in microfiche.
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 species 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 two echinoid lineages crossed from the Paleozoic to the Triassic: one, possessing apophyses, is ancestral to all modern cidaroids; a second, lacking apophyses, gave rise to all noncidaroid echinoids.
Subjects
Italy
,
Paleontology
,
Sea urchins, Fossil
,
Triassic
BHL Collections
Unearthed! Smithsonian Libraries' Paleo Collection
Call Number
QE701 .S56 no. 56
Language
English
Identifiers
DOI:
https://doi.org/10.5479/si.00810266.56.1
GPO:
910-D (microfiche)
LCCN:
https://lccn.loc.gov/83600346
OCLC:
10184080
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