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Patagosuchus anielensis : ウィキペディア英語版
Patagosuchus

''Patagosuchus'' is an extinct genus of peirosaurid crocodyliform known from the early Late Cretaceous Portezuelo Formation of Neuquén Province, western central Argentina. It contains a single species, ''Patagosuchus anielensis''. It is distinguished from other peirosaurids by its extremely heterodont dentition, which includes small serrated teeth at the front of the jaws with much larger, laterally compressed caniniform teeth behind them. ''Patagosuchus'' also has large spaces between its teeth called interalveolar spaces that are not found in any other peirosaurid.
==Discovery==
''Patagosuchus'' is known solely from its holotype, MANE-PV 1, which consists of some associated bones belonging to a single individual. The remains include a fragmentary left dentary and splenial, the right maxilla and right jugal bone, a back vertebra, a back osteoderm and the right humerus. MANE-PV 1 was discovered at the Baal Quarry, in the Loma de La Lata area, near the northern coast of Lago Los Barreales, 12 km south of Añelo City, southeastern Neuquén Province of Patagonia. It was collected from the Portezuelo Formation which is the older of the two formations in the Río Neuquén Subgroup, of the Neuquén Group, dating to the late Turonian to early Coniacian of the early Late Cretaceous. ''Patagosuchus'' is the second peirosaurid described from this formation, along with ''Lomasuchus palpebrosus''. ''Patagosuchus'' represents the third peirosaurid named from the Neuquén Group, with ''Gasparinisuchus peirosauroides'' known from the younger Santonian to early Campanian Bajo de la Carpa and Anacleto Formations,〔 and the more recently named ''Bayomesasuchus hernandezi'' from the underlying late Cenomanian to early Turonian Cerro Lisandro Formation representing the fourth. These represent the five known Patagonian peirosaurids, together with ''Barcinosuchus gradilis'' from the Aptian to Albian Cerro Barcino Formation of Chubut Group.〔

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