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Peirosaurus
''Peirosaurus'' is an extinct genus of peirosaurid crocodylomorph known from the Late Cretaceous period (late Maastrichtian stage) of Minas Gerais, southern Brazil. It contains a single species, ''Peirosaurus torminni''. It is the type genus of the family Peirosauridae.
==Discovery==
''Peirosaurus'' is known from the holotype DGM 433-R, fragmentary skull (left premaxilla bearing five teeth, isolated maxillary and dentary teeth and left palpebral bone) and partial postcranial skeleton including radius, ulna, left pubis and ischium, some presacral and a single caudal vertebrae, ribs, haemal arches and dermal plates. It was collected by Llewellyn Ivor Price in 1947-1949 at the Price Quarry 3, Peirópolis Site near Uberaba, in the Serra de Galga Member of the Marília Formation (Bauru Group), dating to the late Maastrichtian stage of the Late Cretaceous, about 68-66 million years ago.
A partial skull and several postcranial elements such as vertebrae and dermal plates from the Bajo de la Carpa Formation in Argentina and another partial skull and several unprepared postcranial elements from the Anacleto Formation, Argentina, were assigned to ''Peirosaurus'' by Gasparini, Chiappe and Fernandez (1991) and Praderio, Martinelli and Candeiro (2008), respectively. However, more recently Agustín G. Martinelli, Joseph J.W. Sertich, Alberto C. Garrido and Ángel M. Praderio concluded that the traits which used to unite the holotype (from Brazil) and the referred material from Argentina are shared with other peirosaurids and some other mesoeucrocodylians. They reassigned the Argentinian specimens to a new genus, ''Gasparinisuchus'', and although overlapping materials between the genera are limited to the premaxilla and the dentition, ''Gasparinisuchus'' can be differentiate from ''Peirosaurus'' on the basis of its broad, rounded rostrum, anteroposteriorly short premaxilla, reduced perinareal fossa, and short premaxillary interdental spaces. Hence, ''Peirosaurus'' is known only from its holotype.
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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