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A new small-sized predatory pseudosuchian archosaur from the Middle-Late Triassic of Southern Brazil
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A new small-sized predatory pseudosuchian archosaur from the Middle-Late Triassic of Southern Brazil
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Journal Article
A new small-sized predatory pseudosuchian archosaur from the Middle-Late Triassic of Southern Brazil
2024
Overview
Before the rise of dinosaurs and pterosaurs, pseudosuchians—reptiles from the crocodilian lineage—dominated the Triassic land ecosystems. This lineage diversified into several less inclusive clades, resulting in a wide ecomorphological diversity during the Middle and Late Triassic. Some giant pseudosuchians occupied the top of the trophic webs, while others developed extensive bony armor as a defense mechanism, which later evolved as a convergence in the avemetatarsalian lineage. On the other hand, there were groups like the Gracilisuchidae, which was composed of carnivorous forms with lightweight build and less than 1 m in length. The fossil record of gracilisuchids is geographically restricted to China and Argentina, with one ambiguous record from Brazil. In the present study, the first unambiguous gracilisuchid from Brazil is described.
Parvosuchus aurelioi
gen. et sp. nov. comes from the
Dinodontosaurus
Assemblage Zone of the Santa Maria Formation, which is associated with the Ladinian-Carnian boundary. Composed of a complete cranium, vertebrae, pelvic girdle and hindlimbs, the new species nests with
Gracilisuchus stipanicicorum
and
Maehary bonapartei
in a phylogenetic analysis. Its discovery fills a taxonomic gap in Brazilian pseudosuchian fauna and reveals the smallest known member of this clade from the
Dinodontosaurus
Assemblage Zone, highlighting the diversity of pseudosuchians during the moment that preceded the dawn of dinosaurs.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
