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New loricata remains from the Pinheiros-Chiniquá Sequence (Middle-Upper Triassic), southern Brazil

2022; Elsevier BV; Volume: 120; Linguagem: Inglês

10.1016/j.jsames.2022.104089

1873-0647

Letícia de Oliveira Rezende, Átila Augusto Stock Da‐Rosa, Marcel B. Lacerda, Flávio Augusto Pretto,

Evolution and Paleontology Studies

Loricatans have an almost worldwide distribution, with a diverse range of body plans and a temporal distribution that extends from the Triassic Period until the present. Middle-Upper Triassic strata from southern Brazil preserved several records of Loricata traditionally bundled as ‘Rauisuchians’, including Prestosuchus chiniquensis, Decuriasuchus quartacolonia, Dagasuchus santacruzensis and Rauisuchus tirandentes. In this study we describe isolated vertebrae, scapula and ilium from the Dinodontosaurus Association Zone, which are compatible in terms of morphology, size and stratigraphical context to the other early Loricata from this unit. The ilium in particular was recognized as pertaining to the genus Prestosuchus. This assignation is supported by the shared dorsally concave curvature of the iliac blade, which was recovered as a synapomorphy for the genus in a phylogenetic analysis. Therefore, this contribution presents new comparative material, especially in the case of poorly sampled elements for the genus (such as the ilium). Additionally, the Linha Várzea Site, where the materials come from, is added to the map of records of Loricata from the Brazilian Triassic.