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Prestosuchus : ウィキペディア英語版
Prestosuchus

''Prestosuchus'' is an extinct genus of pseudosuchian in the family Prestosuchidae. Its close relatives include ''Saurosuchus'' and ''Postosuchus''.
==Description==

Like other related prestosuchids, ''Prestosuchus'' had a deep skull and serrated teeth. ''Prestosuchus'' lived during the Late Triassic in what is now Brazil. It reached lengths of nearly 5 metres. While it resembled a dinosaur in having a large body and upright posture it was actually a rauisuchian archosaur more closely related to modern crocodilians.
''Prestosuchus'' walked on four legs like crocodilians, but unlike crocodilians it had an upright semi-erect stance with limb bones placed below the hips. In 2013, a study of the structure of its hind limb bones inferred that ''Prestosuchus chiniquensis'' had 13 leg muscle groups in common with both crocodilians and birds (which together make up the two living groups of archosaurs) but only two muscle groups in common with only crocodilians, indicating that the musculature of ''Prestosuchus'' better represents a basal ("primitive") condition for archosaurs than it does a derived condition for crocodile-line or pseudosuchian archosaurs. The leg musculature of ''Prestosuchus'' was also compared to that of ''Poposaurus'', a Triassic pseudosuchian that walked on two legs. While the strongest leg muscles of ''Poposaurus'' are thought to drive the forward and backward motion of the leg necessary for bipedal movement, the strongest leg muscles of ''Prestosuchus'' were responsible for the rotation of the limb, which is an indication of quadrupedal movement.

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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