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Proterochampsia: An Endemic Archosauriform Clade from South America

By
María Jimena Trotteyn
María Jimena Trotteyn
INGEO, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Campus Universitario ‘Islas Malvinas’, Ignacio de la Rosa 590 (oeste), Rivadavia CP 5400, San Juan, ArgentinaCONICET – Consejo Nacional de Investigaciones Científicas y Técnicas, Rivadavia 1917 C1033AAJ CABA, Argentina
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Andrea B. Arcucci
Andrea B. Arcucci
Area de Zoología, Departamento de Bioquímica y Ciencias Biológicas, Universidad Nacional de San Luis, Chacabuco 917, San Luis, CP 5700, Argentina
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Tiago Raugust
Tiago Raugust
Universidade Federal do Rio Grande do Sul. Instituto de Geociências, Programa de Pós-Graduação em Geociências, Av. Bento Gonçalves, 9500 – Bloco J, Prédio 43127, Sala 114, Campus do Vale – Agronomia, Porto Alegre, Rio Grande do Sul, Caixa Postal 15001, CEP 91540-000, Brazil
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Published:
January 01, 2013

Abstract

Proterochampsia is a monophyletic group of crocodile-like archosauriforms currently endemic to the late Middle and early Late Triassic of South America considered as one of the potential successive sister-taxa of the crown group Archosauria. The proterochampsians come from the Ischigualasto-Villa Unión Basin in the west of Argentina and the Parana Basin in the south of Brazil. The traditional composition of the group includes the genera Cerritosaurus Price 1946, Proterochampsa Reig 1959 (with two species: P. barrionuevoi in Argentina and P. nodosa Barberena 1982 in Brazil), Chanaresuchus Romer (with two species from Argentina: C. bonapartei Romer and C. ischigualastensis Trotteyn et al. 2012), Gualosuchus reigi Romer 1971 and Tropidosuchus romeri Arcucci 1990. After a precladistic history of confusion about their relationships with crocodilians, in the last 20 years new discoveries of taxa, and more systematic and phylogenetic studies, have clarified their position as non-archosaurian archosauriforms and their relationships with other Triassic archosaurs.

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Geological Society, London, Special Publications

Anatomy, Phylogeny and Palaeobiology of Early Archosaurs and their Kin

S. J. Nesbitt
S. J. Nesbitt
University of Washington, USA
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J. B. Desojo
J. B. Desojo
Museo Argentino de Ciencias Naturales ‘Bernardino Rivadavia’, Argentina
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R. B. Irmis
R. B. Irmis
Natural History Museum of Utah, USA
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Geological Society of London
Volume
379
ISBN electronic:
9781862396395
Publication date:
January 01, 2013

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