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Ordovician pliomerid and prosopiscid trilobites from Argentina

Published online by Cambridge University Press:  20 May 2016

Gregory D. Edgecombe ,
Brian D. E. Chatterton ,
Beatriz G. Waisfeld  and
Norberto E. Vaccari
Gregory D. Edgecombe
Affiliation:
Australian Museum, 6 College Street, Sydney South, NSW 2000, Australia,
Brian D. E. Chatterton
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
Beatriz G. Waisfeld
Affiliation:
Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Avenida Ángel Gallardo 470, 1405 Buenos Aires, Argentina
Norberto E. Vaccari
Affiliation:
Instituto de Geología y Minería, Universidad Nacional de Jujuy, Avenida Bolivia 1661, C.C. 258, San Salvador de Jujuy, Argentina
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Abstract

Pliomerina Chugaeva, 1958, a characteristic element of the peri-Gondwanan Eokosovopeltis-Pliomerina Province, occurs in Llanvirn and Caradoc strata of the Argentine Precordillera. Three protaspid instars are present in the ontogeny of the Early Caradoc Pliomerina peripata new species. A species possibly representing Pliomerella is a rare element in Early Caradoc strata of the Las Aguaditas Formation. Prosopiscus is represented by a Llanvirn species with a first record of protaspid larvae for the enigmatic Family Prosopiscidae. Early growth stages support closest relations of prosopiscids to Phacopina. The presence of Pliomerina and Prosopiscus, along with the cheirurid Pateraspis, demonstrates a peri-Gondwanan influence on the Precordilleran fauna by the Llanvirn, and supports the proximity of the Precordillera terrane to the South American margin by that time.

Type
Research Article
Information
Journal of Paleontology , Volume 73 , Issue 6 , November 1999 , pp. 1144 - 1154
Copyright
Copyright © The Paleontological Society 

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