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Ontogeny and relationships of the Ordovician odontopleurid trilobite Ceratocara, with new species from Argentina and New York

Published online by Cambridge University Press:  20 May 2016

Brian D. E. Chatterton ,
Gregory D. Edgecombe ,
Norberto E. Vaccari  and
Beatriz G. Waisfeld
Brian D. E. Chatterton
Affiliation:
1Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, T6G 2E3, Canada
Gregory D. Edgecombe
Affiliation:
2Division of Earth and Environmental Sciences, Australian Museum, 6 College Street, Sydney South, NSW 2000, Australia
Norberto E. Vaccari
Affiliation:
3CONICET, Cátedra de Estratigrafia y Geología Histórica, Universidad Nacional de Córdoba, Avenida Vélez Sársfield 299, 5000 Córdoba, Argentina
Beatriz G. Waisfeld
Affiliation:
3CONICET, Cátedra de Estratigrafia y Geología Histórica, Universidad Nacional de Córdoba, Avenida Vélez Sársfield 299, 5000 Córdoba, Argentina
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Abstract

A growth series is described for a new species of Ceratocara Ramsköld, 1991, C. argentina, from the Upper Ordovician (Caradoc) part of the Las Aguaditas Formation, near Jáchal in San Juan Province, Argentine Precordillera. Another new species of Ceratocara, C. shawi, is described from the Middle Ordovician (lower Chazy) Crown Point Formation of New York. A phylogenetic analysis is presented for these species, other well-known Ordovician species of Ceratocara, and some Ordovician species of Ceratocephala, with Ceratocephalina tridens Whittington, 1956, as outgroup. The analysis presented supports the monophyly of both Ceratocara and Ceratocephala Warder, 1838, their divergence having occurred by the middle Arenig. The ontogenies of the Ceratocara species from Argentina and New York, complete from protaspid to holaspid growth stages, are some of the best preserved odontopleurid ontogenies described to date. Material of Ceratocephala triacantheis Whittington and Evitt, 1954, from the Crown Point Formation of the Chazy Group of New York, is discriminated from that of Ceratocara shawi.

Type
Research Article
Information
Journal of Paleontology , Volume 71 , Issue 1 , January 1997 , pp. 108 - 125
Copyright
Copyright © The Paleontological Society 

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