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Vytshegdosuchus
''Vytshegdosuchus'' is an extinct genus of paracrocodylomorph archosaur known from the Early Triassic (latest Olenekian stage) Yarenskian Gorizont of the Komi Republic of the European section of Russia. It contains a single species, ''Vytshegdosuchus zheshartensis''. ''Vytshegdosuchus'' was named by Andreii Sennikov in 1988.〔
==Discovery==
''Vytshegdosuchus'' is known from the holotype PIN 3361/134, a right ilium, and possibly from the paratype PIN 3361/127, a partial femur. These specimens were collected from the a fossil assemblage called the ''Parotosuchus'' fauna of the Upper Yarenskian Gorizont, in the Zheshart locality along the Vychegda River in Aikino district of the Komi Republic. A pterygoid and postcranial material from the Gam locality, a cervical vertebra (PIN 3369/139) from another locality and postcrania from the Mezhog locality were also assigned to ''Vytshegdosuchus'' by Sennikov (1999).〔〔 Nesbitt (2009) argued that the specimens referred to ''Vytshegdosuchus'' cannot unambiguously be assigned to that taxon, as these localities are well separated, and the bones were found isolated. ''Vytshegdosuchus'' occurs with the erythrosuchian ''Garjainia'' and the possibe proterosuchian ''Gamosaurus'' and demonstrates there was clear temporal overlap with paracrocodylomorph archosaurs and at least erythrosuchians as predicted earlier by phylogenetic analyses. A similar faunal assemblage is present in the Heshanggou Formation of China, which dates to the late Early and possibly early Middle Triassic, as evidenced by the cooccurrence of the basal erythrosuchian ''Fugusuchus'' and the poposauroid ''Xilousuchus''.
The holotype of ''Vytshegdosuchus'' is also the oldest material currently considered as belonging to Archosauria from Russia, and the only from the Early Triassic. Furthermore, a numerical phylogenetic analysis performed by Nesbitt (2011) placed it in the Paracrocodylomorpha. The Yarenskian Gorizont is generally considered late Olenekian in age on the basis of palynology and the presence of the characteristic Olenekian temnospondyl ''Parotosuchus''. ''Parotosuchus'' also occurs in Germany within three formations of the Middle Buntsandstein, and is therefore broadly of Olenekian age and considered an index taxon for these strata. ''Vytshegdosuchus'' is from the Gamskian, the upper biochron of the Yarenskian Gorizont and may therefore be latest Olenekian in age and approximately contemporaneous with the poposauroid ''Ctenosauriscus''.
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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