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Machaeroprosopus
''Machaeroprosopus'' is an extinct genus of pseudopalatine phytosaurid from the Late Triassic of the southwestern United States. ''M. validus'', once thought to be the type species of ''Machaeroprosopus'', was named in 1916 on the basis of three complete skulls from Chinle Formation, Arizona. The skulls have been lost since the 1950s, and a line drawing in the original 1916 description is the only visual record of the specimen. Another species, ''M. andersoni'', was named in 1922 from New Mexico, and the species ''M. adamanensis'', ''M. gregorii'', ''M. lithodendrorum'', ''M. tenuis'', and ''M. zunii'' were named in 1930. Most species have been reassigned to the genera ''Smilosuchus'', ''Rutiodon'', ''Pseudopalatus'', or ''Phytosaurus''. Until recently, ''M. validus'' was considered to be the only species that has not been reassigned. Thus, ''Machaeroprosopus'' was considered to be a ''nomen dubium'' or "doubtful name" because of the lack of diagnostic specimens that can support its distinction from other phytosaur genera. However, a taxonomic revision of ''Machaeroprosopus'', conducted by Parker ''et al.'' (in press), revealed that UW 3807, the holotype of ''M. validus'', is not the holotype of ''Machaeroprosopus'', while the previously named species ''Pseudopalatus buceros'' has priority as the type species of the genus. Therefore, the name ''Pseudopalatus'' must be considered a junior synonym of ''Machaeroprosopus'', and all species of the former must be reassigned to the later. This revised taxonomy was already accepted in several studies, including Stocker and Butler (2013). Stocker and Butler (2013) also treated ''M. andersoni'' as a valid species,〔 and not a junior synonym of ''Machaeroprosopus buceros'' as was previously suggested by Long and Murry (1995).
==Species==
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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