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Rauisuchids are large (2–6 m in length), carnivorous, and quadrupedal pseudosuchian archosaurs closely related to crocodylomorphs. Though geographically widespread, fossils of this clade are relatively rare in Late Triassic assemblages. The middle Norian (∼212 Ma) Hayden Quarry of northern New Mexico, USA, in the Petrified Forest Member of the Chinle Formation, has yielded isolated postcranial elements and associated skull elements of a new species of rauisuchid.  Vivaron haydeni  gen. et. sp. nov. is diagnosed by the presence of two posteriorly directed prongs at the posterior end of the maxilla for articulation with the jugal. The holotype maxilla and referred elements are similar to those of the rauisuchid  Postosuchus kirkpatricki  from the southwestern United States, but  V. haydeni  shares several maxillary apomorphies (e.g., a distinct dropoff to the antorbital fossa that is not a ridge, a straight ventral margin, and a well defined dental groove) with the rauisuchid  Teratosaurus suevicus  from the Norian of Germany. Despite their geographic separation, this morphological evidence implies a close phylogenetic relationship between  V. haydeni  and  T. suevicus . The morphology preserved in the new Hayden Quarry rauisuchid  V. haydeni  supports previously proposed and new synapomorphies for nodes within Rauisuchidae. The discovery of  Vivaron haydeni  reveals an increased range of morphological disparity for rauisuchids from the low-paleolatitude Chinle Formation and a clear biogeographic connection with high paleolatitude Pangea.

A new rauisuchid (Archosauria, Pseudosuchia) from the Upper Triassic (Norian) of New Mexico increases the diversity and temporal range of the clade