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The braincase of Prestosuchus chiniquensis (Archosauria: Suchia)

By
Bianca Martins Mastrantonio
Bianca Martins Mastrantonio
Laboratório de Paleovertebrados, Departamento de Paleontologia e Estratigrafia, Instituto de Geociências–Universidade Federal do Rio Grande do Sul (UFRGS), Cx. P. 15001, 91501–970, Porto Alegre, RS, Brazil
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Cesar L. Schultz
Cesar L. Schultz
Laboratório de Paleovertebrados, Departamento de Paleontologia e Estratigrafia, Instituto de Geociências–Universidade Federal do Rio Grande do Sul (UFRGS), Cx. P. 15001, 91501–970, Porto Alegre, RS, Brazil
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Julia B. Desojo
Julia B. Desojo
CONICET, Comisión Nacional de Investigación Científica y Técnica, Sección de Paleontología Vertebrados, Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Ángel Gallardo 470 C1405DJR, Buenos Aires, Argentina
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Juliana Bittencourt Garcia
Juliana Bittencourt Garcia
Centro Universitário Metodista IPA, Rua Joaquim Pedro Salgado, 80, Porto Alegre, RS, Brazil
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Published:
January 01, 2013

Abstract

The osteology of an almost complete braincase of the rauisuchian archosaur Prestosuchus chiniquensis from the Middle Triassic of Brazil is described for first time, based on two specimens (UFRGS-PV-0629-T and UFRGS-PV-0156-T). A comparative description with other taxa of rauisuchians is presented that forms the basis of a phylogenetic analysis. To perform the phylogenetic analysis, we describe and discuss each character codification for a modified version of the recent matrices of Gower (2002), Gower & Nesbitt (2006) and Brusatte et al. (2010). The analysis resulted in two most parsimonious trees that differ from the topologies recovered by Gower (2002) in a few aspects within Rauisuchia, and Prestosuchus chiniquensis was unequivocally depicted as deeply nested within Pseudosuchia, as the sister taxon of Batrachotomus kuperferzellensis in both topologies, supported by a single synapomorphy: the reduced to small fissure of the post-temporal fenestra between parietal, supraoccipital and exoccipital-opisthotic.

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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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