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Some extinct reptiles, such as proterosuchids and euparkeriids, also possessed these features yet originated prior to the split between the crocodilian and bird lineages. The older morphological definition of Archosauria nowadays roughly corresponds to Archosauriformes , a group named to encompass crown-group archosaurs and their close relatives.
Extinct archosaurs include non-avian dinosaurs, pterosaurs, and extinct relatives of crocodilians. Modern paleontologists define Archosauria as a crown group that includes the most recent common ancestor of living birds and crocodilians, and all of its descendants.
Archosaurus (meaning "ruling lizard") is an extinct genus of carnivorous proterosuchid archosauriform reptile. [1] Its fossils are dated to the latest Permian of Russia and Poland , it is one of the earliest known archosauriforms.
Euparkeriidae is an extinct family of small carnivorous archosauriforms which lived from the Early Triassic to the Middle Triassic ().While most other early archosauriforms walked on four limbs, euparkeriids were probably facultative bipeds that had the ability to walk on their hind limbs at times.
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Scientific name Range Comments Peruvian rail: Rallus semiplumbeus peruvianus: Peruvian highlands and possibly Ecuador Only known from the holotype collected in 1886, which is now lost. [51] Rallus sp. Fernando de Noronha Island, Brazil A flightless species known from subfossil remains, presumably extinct due to predation by introduced mammals. [52]
Saurosuchus (meaning "lizard crocodile") is an extinct genus of large loricatan pseudosuchian archosaurs that lived in South America during the Late Triassic period. It was a heavy, ground-dwelling, quadrupedal carnivore , likely being the apex predator in the Ischigualasto Formation .
E. Robert and L. G. Bulot. 2005. Albian ammonite faunas from Peru: The genus Neodeshaesites Casey, 1964. Journal of Paleontology 79(3):611-618; M. R. Sandy. 1994. Triassic-Jurassic articulate brachiopods from the Pucara Group, central Peru, and description of the brachidial net in the spiriferid Spondylospira. Palaeontographica Abteilung A 233: ...