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First Clarkeia and Heterorthella (Brachiopoda; Lower Silurian) occurrence from the Paraná Basin in eastern Paraguay

Published online by Cambridge University Press:  20 May 2016

A. J. Boucot ,
Jose Henrique G. de Melo ,
Eugenio V. Santos Neto  and
Sven Wolff
A. J. Boucot
Affiliation:
1Department of Zoology, Oregon State University, Corvallis 97331
Jose Henrique G. de Melo
Affiliation:
2Petrobrás/Cenpes/Divex, Cidade Universitária, Ilha do Fundão, 21910 Rio de Janeiro, RJ, Brazil
Eugenio V. Santos Neto
Affiliation:
2Petrobrás/Cenpes/Divex, Cidade Universitária, Ilha do Fundão, 21910 Rio de Janeiro, RJ, Brazil
Sven Wolff
Affiliation:
3Petrobrás Nexpar, R. Padre Camargo, 261–285, 80060 Curitiba, Brazil
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Extract

The existence of the Malvinokaffric Realm during the Silurian (Boucot, 1990) is based on the presence of three endemic brachiopod genera (Anabaia, Clarkeia, Heterorthella), and their absence in the coeval North Silurian Realm, where roughly 100 other brachiopod genera Aegiria to Zygospiraella are present. Within the Malvinokaffric Realm the vast reaches of the Paraná Basin, covering an area almost equivalent to the United States east of the Mississippi River, has previously yielded only Anabaia, and that from a single area. In light of this, the recognition of both Clarkeia and Heterorthella within the confines of the Paraná Basin is noteworthy.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 65 , Issue 3 , May 1991 , pp. 512 - 514
Copyright
Copyright © The Paleontological Society 

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