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Protosuchia is a group of extinct Mesozoic crocodyliforms. They were small in size (~1 meter in length) and terrestrial. In phylogenetic terms, Protosuchia is considered an informal group because it is a grade of basal crocodyliforms, not a true clade. ==Classification== Recent phylogenetic analyses have not supported Protosuchia as a natural group. However, two studies found a clade of Late Triassic-Early Jurassic animals:〔Pol D, Ji S-a, Clark JM, Chiappe LM. 2004. Basal crocodyliforms from the Lower Cretaceous Tugulu Group (Xinjiang, China), and the phylogenetic position of ''Edentosuchus''. ''Cretaceous Research'' 25: 603-622.〕〔Fiorelli LE, Calvo JO. 2007. The first "protosuchian" (Archosauria: Crocodyliformes) from the Cretaceous (Santonian) of Gondwana. ''Arquivos do Museu Nacional, Rio de Janeiro'' 65 (4): 417-459.〕 *''Edentosuchus'' *''Hemiprotosuchus'' *''Orthosuchus'' *''Protosuchus'' Both of these studies also found a clade more closely related to ''Hsisosuchus'' and Mesoeucrocodylia consisting of Late Jurassic-Late Cretaceous genera:〔〔 *''Neuquensuchus'' *''Shantungosuchus'' *''Sichuanosuchus'' *''Zosuchus'' However, other possible protosuchians from the Late Cretaceous of China-Mongolia, the Gobiosuchidae (''Gobiosuchus'' and ''Zaraasuchus''), have been found to either intermediate between these two clades,〔 or members of the ''Sichuanosuchus'' clade.〔 There is also another family of Late Jurassic-Late Cretaceous genera, the Shartegosuchidae (e.g. ''Kyasuchus'', ''Shartegosuchus'' and ''Nominosuchus''). Below is a cladogram from Fiorelli and Calvo (2007).〔 Protosuchians are marked by the green bracket. }} }} |label2= Mesoeucrocodylia |2= }} }} |barend1=green |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「Protosuchia」の詳細全文を読む スポンサード リンク
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