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Ornithosuchidae is an extinct family of pseudosuchian archosaurs (distant relatives of modern crocodilians) from the Triassic period. Ornithosuchids were quadrupedal and facultatively bipedal (e.g. like chimpanzees), meaning that they had the ability to walk on two legs for short periods of time.
A single species of Ornithosuchus is recognized, O. woodwardi; O. taylori is a synonym. [3]"Dasygnathus" longidens was in 1877 created by Thomas Huxley for a right maxilla from the Lossiemouth Sandstone found in 1857.
Venaticosuchus is a genus of pseudosuchian archosaurs from the family Ornithosuchidae.Known from a single species, Venaticosuchus rusconii, this genus is described based on an incomplete skull and jaw (as well as a lost partial forelimb and osteoderms) collected from the Late Triassic Ischigualasto Formation in the Ischigualasto-Villa Unión Basin in northwestern Argentina, which was deposited ...
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Riojasuchus is an extinct genus of ornithosuchid archosaur from the Late Triassic of Argentina.Ornithosuchidae was a widespread family of facultatively bipedal pseudosuchians (crocodilian-line archosaurs) with adaptations for scavenging.
Ornithosuchids were once considered bird-line archosaurs (as implied by their name, which means "bird crocodiles" in Greek), but were later recognized as crocodile-line archosaurs. This reclassification may have inspired Sereno's Crurotarsi, a node-based clade defined by the inclusion of ornithosuchids and other early archosaurs.
Like other ornithosuchids, the snout of Dynamosuchus had a hooked premaxilla with three teeth, followed by a gap (a diastema) and a deep maxilla with six to eight teeth. The maxilla was similar to that of Ornithosuchus due to possessing pitting on its outer surface (absent in Venaticosuchus and Riojasuchus ) and a not particularly deep ...
Ornithosuchids were thought to be ancestral to dinosaurs at this time. In 1979, A.R.I. Cruickshank identified the basal split and thought that the crurotarsan ankle developed independently in these two groups, but in opposite ways.