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Xinminosaurus
''Xinminosaurus'' is an extinct genus of basal ichthyopterygian known from the Middle Triassic (mid-late Anisian stage) of Guizhou Province, China. It was first named by Dayong Jiang, Ryosuke Motani, Weicheng Hao, Lars Schmitz, Olivier Rieppel, Yuanlin Sun and Zuoyu Sun in 2008 and the type species is ''Xinminosaurus catactes''. The generic name is derived from ''Xinmin'', the district where the fossil was found, and Greek ''sauros'', "lizard". The specific name is derived from Greek ''kataktes'', "crusher", in reference to one of the taxon's autapomorphies - the presence of bulbous and laterally compressed crushing teeth in maxilla and posterior dentary. ''Xinminosaurus'' is known only from the holotype GMPKU-P-1071, a nearly complete skeleton deposited in Geological Museum, Peking University. It was collected from the Conodont ''Nicoraella kockeli'' biozone (Pelsonian of the Anisian stage), from the upper member of the Guanling Formation. It was found near Yangjuan Village of the Xinmin District, Panxian County.
Maisch (2010) suggested that ''Xinminosaurus'' might be a subjective junior synonym of ''Tholodus''. Although Jiang ''et al.'' (2008) regarded ''Tholodus'' to be a possible ''nomen dubium'', Maisch (2010) rejected this opinion, stating that ''Tholodus'' is easily recognized and characterized by unequivocal dental autapomorphies, so that even jaw and tooth fragments are diagnostic, and it is thus a valid taxon. Furthermore, he noted that ''Tholodus'' is clearly distinguishable from all other known marine reptiles, including the possible relative ''Omphalosaurus'', except ''Xinminosaurus''. The only difference between the taxa, according to Maisch (2010), is that ''Tholodus'' specimens are at average twice as large as ''Xinminosaurus'' holotype.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Xinminosaurus」の詳細全文を読む
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