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Argochampsa
''Argochampsa'' (meaning "Argo crocodile", in reference to the mythological ''Argo'' of Jason) is an extinct genus of gavialoid crocodilian, related to modern gharials. It lived in the Paleocene of Morocco. Described by Hua and Jouve in 2004, the type species is ''A. krebsi'', with the species named for the late professor B. Krebs. ''Argochampsa'' had a long narrow snout, and appears to have been marine in habits.
''Argochampsa'' is based on OCP DEK-GE 1201, a nearly complete skull from the Oulad Abdoun Basin, in the vicinity of Khouribga, Morocco. The skull, 43.3 centimeters long (17.0 in), had a long, narrow snout, marking it as a longirostrine crocodilian; the snout made up about 70% of the skull's length. The premaxillae at the tip of the snout were downturned, and the tip somewhat squared off, with the first few tooth positions in a straight line perpendicular to the long axis of the skull. There were five teeth in each premaxilla and 26 in each maxilla (the main tooth-bearing bone of the upper jaw). The nasal bones were fused, and there were several short diastemas or gaps in the tooth row at the tip of the snout.〔 More recently, material from the lower jaw, neck and back vertebrae, the upper arm, and armor has been recovered.
Hua and Jouve performed a cladistic analysis incorporating their new taxon, and found ''Argochampsa'' to be a gavialoid, but outside of the clade Gavialidae. They noted that the snout shape of ''Argochampsa'' is unusual among crocodilians, with only pholidosaurids and ''Terminonaris'' having similarly shaped snout tips, and suggested that this layout may have facilitated precise occlusion. ''Argochampsa'' lived in an environment otherwise dominated by dyrosaurid marine crocodyliforms.〔
==References==
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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