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The ‘Rauisuchia’ are a group of Triassic pseudosuchian archosaurs that displayed a near worldwide distribution. In Brazil, their fossils are found only in the Santa Maria Formation (Paraná Basin) of the Rio Grande do Sul State, specifically in the Middle Triassic  Dinodontosaurus  assemblage zone (AZ) and the Late Triassic  Hyperodapedon  AZ ( Rauisuchus tiradentes ). Between these two cenozones is the  Santacruzodon  AZ (Middle Triassic), whose record was, until now, restricted to non-mammalian cynodonts and the proterochampsian  Chanaresuchus bonapartei . Here we present the first occurrence of a rauisuchian archosaur for this cenozone, from the Schoenstatt outcrop, located near the city of Santa Cruz do Sul and propose a new species, based on biostratigraphical evidence and a comparative osteological analysis.

plos one

First 'Rauisuchian' archosaur (Pseudosuchia, Loricata) for the Middle Triassic Santacruzodon Assemblage Zone (Santa Maria Supersequence), Rio Grande do Sul State, Brazil