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

''Shansisuchus'' (meaning "Shansi Province crocodile") is an extinct genus of archosauriform reptile belonging to the family Erythrosuchidae that lived during the Middle Triassic in what is now China.〔http://piclib.nhm.ac.uk/piclib/www/image.php?search=p&getprev=55818〕 The first fossils of ''Shansisuchus'' were discovered from the Ermaying Formation of Shansi Province in 1964 by Chinese paleontologist Yang Zhongjian. Like other erythrosuchids, ''Shansisuchus'' was a large-bodied carnivore with a large, deep skull.〔 ''Shansisuchus'' is unique among early archosauriforms in having a hole in its skull called a subnarial fenestra.
==Description==

''Shansisuchus'' is a large erythrosuchid distinguished from other members of the group by two characters: a tongue-and-groove articulation between the premaxilla and nasal bones of the skull and the presence of a subnarial fenestra. In ''Shansisuchus'' the premaxilla, a bone that makes up the front of the snout, projects backward and fits into a groove in the nasal, a bone that makes up the top of the snout. The subnarial fenestra is present between the external nares (nasal opening) and the antorbital fenestra, a hole in front of the eye socket. It is separated from the antorbital fenestra by a vertical projection of the maxilla bone. A subnarial fenestra is present in a few other more derived archosauriforms such as some dinosaurs and pseudosuchians, but its morphology in ''Shansisuchus'' is unique.

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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