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Metasuchia is a major clade within the superorder Crocodylomorpha. It is split into two main groups, Notosuchia and Neosuchia. Notosuchia is an extinct group that contains primarily small-bodied Cretaceous taxa with heterodont dentitions. Neosuchia includes extant crocodylians and basal taxa such as peirosaurids and pholidosaurids. It is phylogenetically defined by Sereno ''et al.'' (2001) as a clade containing ''Notosuchus terrestris'', ''Crocodylus niloticus'', and all descendants of their common ancestor. ==Phylogenetics== The phylogeny of basal metasuchians has experienced many revisions in recent years.〔 The phylogeny of notosuchians has been particularly revised, with the construction of Sebecia by Larsson and Sues (2007) to include peirosaurids in the clade. Previously, peirosaurids were placed outside of Notosuchia. Larsson and Sues (2007) also suggested that Sebecosuchia (containing the families Baurusuchidae and Sebecidae) was polyphyletic, as ''Baurusuchus'' was placed outside Sebecia, which itself was placed outside Notosuchia. However, more recent phylogenetic studies have placed ''Baurusuchus'' within Notosuchia once again, although it is still not considered to be a sebecosuchian.〔 Cladogram after Sereno ''et al.'', 2001:〔 |label2= Peirosauridae |2= |3=Atoposauridae |label4= Neosuchia |4= }} }} |2= }} }} }} Cladogram after Sereno ''et al.'', 2003: }} }} |2= }} }} |2= }} }} }} }} }} Cladogram after Sereno and Larsson, 2009:〔 }} |2= |2= }} |2= }} }} |label2= Neosuchia |2= }} }} }} |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「Metasuchia」の詳細全文を読む スポンサード リンク
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