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poposauridae
Poposauridae is a family of large (around 2.5 to 5 meters long) carnivorous archosaurs which lived alongside dinosaurs during the Late Triassic. Poposaurids are known from fossil remains from North and South America. While originally believed to be theropod dinosaurs (they mirrored the theropods in a number of respects, such as features of the skull and bipedal locomotion), cladistic analysis has shown them to be of closer relation to crocodiles.
An early cladistic analysis of crocodylotarsan archosaurs included ''Poposaurus'', ''Postosuchus'', ''Teratosaurus'', and ''Bromsgroveia'' within Poposauridae.〔Parrish JM. 1993. Phylogeny of the Crocodylotarsi, with reference to archosaurian and crurotarsan monophyly. ''Journal of Vertebrate Paleontology'' 13: 287-308.〕 However, later studies found ''Teratosaurus'' to be a rauisuchid.〔Long RA, Murry PA. 1995. Late Triassic (Carnian and Norian) tetrapods from the Southwestern United States. ''New Mexico Museum of Natural History & Science Bulletin'' 4: 1-254.〕〔Galton PM, Walker AD. 1996. ''Bromsgroveia'' from the Middle Triassic of England, the earliest record of a poposaurid thecodontian reptile (Archosauria: Rauisuchia). ''Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen'' 201 (3): 303-325.〕 All recent phylogenetic analyses place ''Postosuchus'' either as a rauisuchid 〔Weinbaum JC, Hungerbühler A. 2007. A revision of ''Poposaurus gracilis'' (Archosauria: Suchia) based on two new specimens from the Late Triassic of the southwestern U.S.A. ''Palaeontologische Zeitschrift'' 81(2):131-145.〕 or a prestosuchid.〔Gower DJ. 2002. Brain case evolution in suchian archosaurs: evidence from the rauisuchian ''Batrachotomus''. ''Zoological Journal of the Linnean Society'' 136: 49-76.〕〔Nesbitt SJ, Norell MA. 2006. Extreme convergence in the body plans of an early suchian (Archosauria) and ornithomimid dinosaurs (Theropoda). ''Proceedings of the Royal Society of London B'' 273: 1045–1048.〕〔Nesbitt S. 2007. The anatomy of ''Effigia okeeffeae'' (Archosauria, Suchia), theropod-like convergence, and the distribution of related taxa. ''Bulletin of the American Museum of Natural History'' 302: 84 pp.〕
==Genera==
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