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First basal synapsids (“pelycosaurs”) from the Upper Permian-?Lower Triassic of Uruguay, South America

Published online by Cambridge University Press:  20 May 2016

Graciela Piñeiro ,
Mariano Verde ,
Martín Ubilla  and
Jorge Ferigolo
Graciela Piñeiro
Affiliation:
Departamento de Paleontología, Facultad de Ciencias, Iguá 4225, CP 11400, Montevideo, Uruguay,
Mariano Verde
Affiliation:
Departamento de Paleontología, Facultad de Ciencias, Iguá 4225, CP 11400, Montevideo, Uruguay,
Martín Ubilla
Affiliation:
Departamento de Paleontología, Facultad de Ciencias, Iguá 4225, CP 11400, Montevideo, Uruguay,
Jorge Ferigolo
Affiliation:
Museu de Ciências Naturais, Fundação Zoobotânica do Rio Grande do Sul. Av. Dr. Salvador França 1427, Jardim Botânico, CEP 90690-000, Porto Alegre, RS, Brasil
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Extract

In their monograph Review of the Pelycosauria, Romer and Price (1940), proposed that the earliest synapsids (“pelycosaurs”) were cosmopolitan, despite the observation that amniotes appeared to be restricted to the paleotropics during the Late Carboniferous and Early Permian (290–282 Ma). Romer and Price (1940) accounted for the scarcity of terrestrial tetrapods, including “pelycosaurs,” in Lower Permian beds elsewhere to the absence of coeval continental deposits beyond North America and Europe. Indeed, most workers recognized a geographical and temporal gap between Permo-Carboniferous “pelycosaurs” and therapsid synapsids. Recent research has confirmed that varanopid and caseid “pelycosaurs” were components of therapsid-dominated Late Permian faunas preserved in Russia and South-Africa (Tatarinov and Eremina, 1975; Reisz, 1986; Reisz et al., 1998; Reisz and Berman, 2001).

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 77 , Issue 2 , March 2003 , pp. 389 - 392
Copyright
Copyright © The Paleontological Society

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