Dynamosuchus collisensis: A new species of Ornithosuchid Pseudosuchian from the Late Triassic Santa Maria Formation of Rio Grande do Sul, Brazil.
[sciencythoughts.blogspot.com]
The radiation of Pseudosuchian Archosaurs during the Triassic Period is characterized by the origin and extinction of several peculiar and disparate clades, such as Aetosauria, Erpetosuchidae, Gracilisuchidae, and Ornithosuchidae. The latter is one of the most enigmatic clades. Coined by Friedrich von Huene in 1908, the Ornithosuchidae have a long and controversial taxonomic history. The clade has been placed in different phylogenetic positions across the Archosauria. Nevertheless, most hypotheses have converged on a position near the base of Pseudosuchia. Three species form the clade: Ornithosuchus woodwardi, from the late Carnian–early Norian Lossiemouth Sandstone Formation of Scotland, Venaticosuchus rusconii, from the late Carnian Ischigualasto Formation of Argentina, and Riojasuchus tenuisceps, from the Norian Los Colorados Formation of Argentina. All members of this group are interpreted to have been carnivorous, putatively scavengers and facultatively bipedal during fast movement. Nevertheless, the fossil record of the group is geographically limited and so far, no remains outside Ischigualasto-Villa Union Basin pf Argentina or the Lossiemouth Sandstone Formation of Scotland have been identified, thus leaving a large gap in their potential biogeographic distribution.
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