Abstract
The Triassic of South America is known for its wide fossil diversity, which includes several terrestrial tetrapods, such as (but not restricted to) non-mammaliaform cynodonts, dicynodonts, early archosauromorphs, procolophonoids, pseudosuchians, and dinosaurs. However, carnivore archosaurs are rare from Brazilian Norian outcrops, being represented by sparse records of dinosaurs, one phytosaur, and some indeterminate isolated teeth. The São Luiz fossil site is one of Brazil's most iconic Norian outcrops, and a great diversity of fossils has already been found there. Most of them, however, are remains of small-sized taxa (less than 40 cm). Here, we describe an isolated tooth of a comparatively large archosaur from this site. The morphology of the new specimen indicates affinities with archosaurs, with serrations restricted to its distal carina and composed of sub-quadrangular denticles with a density of two to three denticles per millimeter. Despite being isolated, this new record adds information on the São Luiz outcrop diversity, indicating the presence of a still undescribed medium/large-sized carnivore.
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