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Acallosuchus
''Acallosuchus'' (meaning "ugly crocodile" in Greek) is an extinct genus of reptile from the Triassic Chinle Formation of the southwestern United States. Although it was discovered in 1923, ''Acallosuchus'' was not described until 1989, when the type species ''A. rectori'' was named. The taxonomy classification of ''Acallosuchus'' is uncertain. Although it is known to be a neodiapsid reptile, it has not been assigned with confidence to any particular group of neodiapsids.
==History==
In 1923, paleontologist Charles Lewis Camp discovered a bone in the Chinle Formation in Petrified Forest National Park (at the time a National Monument). It was found on top of a ''Placerias'' jaw in an area called Crocodile Hill, part of the late Carnian-age Blue Mesa Member of the formation. The bone included the skull and lower jaws of a reptile, but when Camp removed it from the surrounding rock, then it broke apart. Camp described the skull as being long, with a broken rostrum, and thought it belonged to a pterosaur or small dinosaur. Camp's description of this specimen was confined to his field notes and was not published.
In 1983, sixty years after it was first found, the specimen was rediscovered in a cigar box in a storage room of the University of California Museum of Paleontology.〔 Bone fragments were crushed and did not resemble the sketches Camp made in his notes. The specimen was cataloged as UCMP 7038/27095 and formally described in 1989 as a new genus and species, ''Acallosuchus rectori''. The term "''Acallosuchus"'' means "ugly crocodile" from the Greek "''akalles"'' ("ugly") and "''suchus"'' ("crocodile"). The species was named after Roger Rector, a former superintendent of Petrified Forest National Park, and his wife.〔
A postcranial skeleton was also referred to ''Acallosuchus'' in 1989, although it was not found with the skull material.〔 This skeleton was found in 1962 in an area very close to where Camp found UCMP 7038/27095. It was referred to ''Acallosuchus'' because it belonged to an animal of similar size to UCMP 7038/27095. The two specimens also had bony armor. In 1995, both specimens were redescribed. Because the postcranial skeleton was not associated with the original ''Acallosuchus'' material, it was placed in its own genus called ''Vancleavea''.〔
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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