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Fwd: Pseudochampsa, new proterochampsid archosauriform from Late Triassic of Argentina

Apparently this posting did not get through the first time I tried to send it...

---------- Forwarded message ----------
From: Ben Creisler <bcreisler@gmail.com>
Date: Wed, Nov 26, 2014 at 11:36 AM
Subject: Pseudochampsa, new proterochampsid archosauriform from Late
Triassic of Argentina
To: dinosaur@usc.edu

Ben Creisler

New in PLoS ONE:

Jimena Trotteyn & Martín D. Ezcurra (2014)
Osteology of Pseudochampsa ischigualastensis gen. et comb. nov.
(Archosauriformes: Proterochampsidae) from the Early Late Triassic
Ischigualasto Formation of Northwestern Argentina.
PLoS ONE 9(11): e111388.

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