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Smilosuchus
''Smilosuchus'' (meaning "chisel crocodile") is an extinct genus of leptosuchomorph phytosaurid from the Late Triassic of North America. The type species was first described in 1995 as a replacement generic name for ''Leptosuchus gregorii''.〔Long, R. A., and Murry, P. A. (1995). Late Triassic (Carnian and Norian) tetrapods from the southwestern United States. ''New Mexico Museum of Natural History and Science Bulletin'' 4:1-254.〕 Because of the large rostral crest it possessed, it was considered to be distinct enough from other species of ''Leptosuchus'' (all of which had smaller and more restricted crests) to be within its own genus. Some studies seem to suggest that ''Smilosuchus'' is congeneric with ''Leptosuchus'', as the enlarged crest could have been independently developed in ''Leptosuchus''.〔Irmis, R. B. (2005). The vertebrate fauna of the Upper Triassic Chinle Formation in Northern Arizona. ''In:'' Nesbitt, S. J., Parker, W. G. and Irmis, R. B., eds., ''Guidebook to the Triassic Formations of the Colorado Plateau in northern Arizona: Geology, Paleontology, and History''. Mesa Southwest Museum, Bulletin No. 9.〕 However, newer studies support the idea that ''Smilosuchus'' is distinct from the type species of ''Leptosuchus'', ''Leptosuchus crosbiensis''. Phylogenetic analyses suggest that ''Smilosuchus'' is more closely related to pseudopalatines than to ''Leptosuchus'' species.
==Phylogeny==
Below is a cladogram from Stocker (2012):〔
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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