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Xilousuchus
''Xilousuchus'' is an extinct genus of poposauroid from lower Triassic (Olenekian stage) deposits of Fugu County of northeastern Shanxi Province, China. It is known from the holotype, IVPP V 6026, a single well-preserved partial skeleton including the skull. It was found from the Heshanggou Formation of the Ordos Basin, Hazhen commune. It was first named by Xiao-Chun Wu in 1981 and the type species is ''Xilousuchus sapingensis''. Wu (1981) referred ''Xilousuchus'' to the Proterosuchia. Gower and Sennikov (1996) found it to be an erythrosuchian based strictly on the braincase. A more detailed re-description of the genus was provided by Nesbitt ''et al.'' (2010) and found poposauroid affinities. In his massive revision of archosaurs which included a large cladistic analysis, Sterling J. Nesbitt (2011) found ''Xilousuchus'' to be a poposauroid which is most closely related to ''Arizonasaurus''. ''Xilousuchus'' is the oldest archosaur to date,〔 although ''Ctenosauriscus'' and ''Vytshegdosuchus'' might be even older by less than one million year. Since ''Xilousuchus'' is a suchian archosaur, its early age suggests that most of the major groups of archosaurs (ornithodirans, ornithosuchids, aetosaurs, and paracrocodylomorphs) developed by the Early Triassic, soon after the appearance of the first archosaur.〔〔
== Phylogeny ==
Cladogram after Nesbitt, 2010:〔
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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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