INVESTIGADORES
TROTTEYN Maria Jimena
artículos
Título:
Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the Early Late Triassic Ischigualasto Formation of Northwestern Argentina
Autor/es:
TROTTEYN, MARÍA JIMENA; EZCURRA, MARTÍN D.
Revista:
PLOS ONE
Editorial:
PUBLIC LIBRARY SCIENCE
Referencias:
Lugar: San Francisco; Año: 2014
ISSN:
1932-6203
Resumen:
Proterochampsids are crocodile-like, probably semi-aquatic, quadrupedal
archosauriforms characterized by an elongated and dorsoventrally low skull. The
group is endemic from the Middle-Late Triassic of South America. The most
recently erected proterochampsid species is ??Chanaresuchus ischigualastensis??,
based on a single, fairly complete skeleton from the early Late Triassic
Ischigualasto Formation of northwestern Argentina. We describe here in detail the
non-braincase cranial and postcranial anatomy of this species and revisit its
taxonomy and phylogenetic relationships. The phylogenetic analysis recovered
?Chanaresuchus ischigualastensis? as part of a trichotomy together with
Gualosuchus reigi and Chanaresuchus bonapartei. Accordingly, ??Chanaresuchus
ischigualastensis?? can be potentially more closely related to Gualosuchus reigi, or
even Rhadinosuchus gracilis, than to Chanaresuchus bonapartei. In addition, after
discussing previously claimed synapomorphies of Chanaresuchus, we could not
find unambiguous support for the monophyly of the genus. As a result, we propose
here the erection of the new genus Pseudochampsa for ?Chanaresuchus
ischigualastensis?, which results in the new combination Pseudochampsa
ischigualastensis. The information provided here about the anatomy and taxonomy
of Pseudochampsa ischiguaslastensis will be useful for future quantitative analyses
focused on the biogeography and macroevolutionary history of proterochampsids