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Abstract:

The proterochampsids are a Triassic group of superficially crocodile-like forms belonging to the Archosauriformes. In the present contribution, we present new information regarding the braincase of the proterochampsid Proterochampsa Reig 1959, from the Ischigualasto Formation (Carnian) of Argentina, and discuss its phylogenetic considerations. Some unique neurocranial features of Proterochampsa are described, including: the prominence and thickness of the V-shaped ridge that surrounds the basisphenoidal fossa; the medially concave lateral arms of the same ridge; and the semilunar depression on the parabasisphenoid ventrolaterally exposed. Other features are only shared with likely unrelated archosauriforms, including: the great lateral development of the basipterygoid processes and caudal development of its distal end; an eight-shaped metotic foramen; laterally directed basipterygoid processes; and rostral boundary of the basisphenoidal recess V-shaped. Proterochampsa differs in many other aspects from the archosauriform Chanaresuchus, including: a proportionally shorter basioccipital basal tubera; cultriform process ovoid in cross-section; longitudinal sulcus dorsal to the basipterygoid process; deep basisphenoidal recess; and the absence of a prominent intertuberal plate. In many braincase features, Proterochampsa is more similar to archosaurs than to Euparkeria, erythrosuchids and Proterosuchus. They include a reduced semilunar depression. A ventral border of the basioccipital forming a wide convexity and a dorsoventrally thin paroccipital process likely represents a feature shared with Chanaresuchus, but not with Doswellia and other basal archosauriforms. © 2010 Springer-Verlag.

Registro:

Documento: Artículo
Título:The braincase of a specimen of Proterochampsa Reig (Archosauriformes: Proterochampsidae) from the Late Triassic of Argentina
Autor:Trotteyn, M.J.; Haro, J.A.
Filiación:Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, España 400 (norte), San Juan Capital, Argentina
Centro de Investigaciones Paleobiológicas (CIPAL), Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sársfield 299, 5000 Córdoba, Argentina
Idioma: Inglés
Palabras clave:Anatomy; Archosauriformes; Braincase; Ischigualasto formation; Northwestern Argentina; Proterochampsids
Año:2011
Volumen:85
Número:1
Página de inicio:1
Página de fin:17
DOI: http://dx.doi.org/10.1007/s12542-010-0068-7
Título revista:Palaontologische Zeitschrift
Título revista abreviado:Palaontologische Z.
ISSN:00310220
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00310220_v85_n1_p1_Trotteyn

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Citas:

---------- APA ----------
Trotteyn, M.J. & Haro, J.A. (2011) . The braincase of a specimen of Proterochampsa Reig (Archosauriformes: Proterochampsidae) from the Late Triassic of Argentina. Palaontologische Zeitschrift, 85(1), 1-17.
http://dx.doi.org/10.1007/s12542-010-0068-7
---------- CHICAGO ----------
Trotteyn, M.J., Haro, J.A. "The braincase of a specimen of Proterochampsa Reig (Archosauriformes: Proterochampsidae) from the Late Triassic of Argentina" . Palaontologische Zeitschrift 85, no. 1 (2011) : 1-17.
http://dx.doi.org/10.1007/s12542-010-0068-7
---------- MLA ----------
Trotteyn, M.J., Haro, J.A. "The braincase of a specimen of Proterochampsa Reig (Archosauriformes: Proterochampsidae) from the Late Triassic of Argentina" . Palaontologische Zeitschrift, vol. 85, no. 1, 2011, pp. 1-17.
http://dx.doi.org/10.1007/s12542-010-0068-7
---------- VANCOUVER ----------
Trotteyn, M.J., Haro, J.A. The braincase of a specimen of Proterochampsa Reig (Archosauriformes: Proterochampsidae) from the Late Triassic of Argentina. Palaontologische Z. 2011;85(1):1-17.
http://dx.doi.org/10.1007/s12542-010-0068-7