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Metriacanthosauridae is an extinct family of carnivorous allosauroid theropod dinosaurs. They tended to be large predators, some growing to sizes of . Metriacanthosaurids are carnosaurs, and many were initially classified within Megalosauridae or Allosauridae. A gigantic tooth belonging to what most likely is a giant sinraptorid has been described by Xu and Clarke in 2008.〔Xu, X., Clark, J.M. (2008): The presence of a gigantic theropod in the Jurassic Shishugou Formation, Junggar Basin, western China. Vertebrata PalAsiatica, 46: 158-160. http://www.ivpp.cas.cn/xscbw/xsqk/gjzdwxb/xbwzxz/200811/W020090813369286986655.pdf〕 ==Classification== Cladistically, Sinraptoridae was latest defined in 2005 by Paul Sereno as the most inclusive monophyletic group that contains ''Sinraptor dongi'' and all species closer related to ''Sinraptor'' than to either ''Allosaurus fragilis'', ''Carcharodontosaurus saharicus'', or the house sparrow (''Passer domesticus''). Carrano, Benson & Sampson (2012) noted that the name Metriacanthosauridae should be used as it has priority over Sinraptoridae.〔 Furthermore, they named a new subfamily Metriacanthosaurinae to include all metriacanthosaurids more closely related to ''Metriacanthosaurus'' than to ''Yangchuanosaurus''. A much larger phylogenetic analysis found the basal megalosauroid ''Xuanhanosaurus'' (according to Benson ''et al.'', 2010)〔 (Supporting Information )〕 as the basalmost metriacanthosaurid. Both ''Poekilopleuron'' and ''Lourinhanosaurus'' were recovered outside the family, and many taxa within the Metriacanthosauridae were in polytomy. However, the position of ''Xuanhanosaurus'' and ''Poekilopleuron'' is very unstable, and their exclusion from the analysis gave more resolved and stable cladogram. The cladogram presented here follows that study.〔 |label2=Metriacanthosauridae |2= |label2=Metriacanthosaurinae |2= }} }} }} }} }} }} }} 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「Metriacanthosauridae」の詳細全文を読む スポンサード リンク
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