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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.

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Osteology of Pseudochampsa ischigualastensis gen. et comb. nov. (Archosauriformes: Proterochampsidae) from the Early Late Triassic Ischigualasto Formation of Northwestern Argentina