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Archaeoistiodactylus
''Archaeoistiodactylus'' is an extinct genus of pterosaur from the Middle Jurassic of China. It is known from an incomplete skeleton with a partial skull and lower jaw recovered from rocks of the Tiaojishan Formation in western Liaoning, China. It was first named by Lü Junchang and Fucha Xiaohui in 2010 and the type species is ''Archaeoistiodactylus linglongtaensis''. The authors of its description assigned ''Archaeoistiodactylus'' to the clade Breviquartossa and considered it to be more closely related to the istiodactylids than to any other group of pterosaurs; however, they considered it to be more primitive than the Cretaceous istiodactylids and regarded it as an ancestor, rather than member of istiodactylid pterosaurs. Martill and Etches (2013) suggest that the holotype specimen might actually be a poorly preserved specimen of ''Darwinopterus''. Sullivan ''et al.'' (2014) considered the "distinctive midline tooth in the tip of the rostrum" of the holotype specimen to be a probable valid diagnostic feature of ''A. linglongtaensis''; however, the authors considered it more likely that ''Archaeoistiodactylus'' was a basal monofenestratan than an istiodactylid.
==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「Archaeoistiodactylus」の詳細全文を読む
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