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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Eopneumatosuchus ： ウィキペディア英語版 Eopneumatosuchus ''Eopneumatosuchus'' is an extinct genus of basal crocodyliform. Fossils have been found from two localities within the Kayenta Formation of Arizona. Both localities are around 20 miles southeast of the Grand Canyon and in close proximity to one another. The localities probably date back to the Early Jurassic, most likely during the Sinemurian stage. ''Eopneumatosuchus'' was initially considered to be a protosuchian, first proposed when the genus was named in 1980.〔Crompton, A. W. and Smith, K. K. (1980). A new genus and species from the Kayenta Formation (Late Triassic?) of Northern Arizona. ''In'' Jacobs, L (ed.), ''Aspects of Vertebrate History'' Flagstaff: Museum of Northern Arizona Press, pp. 193-217.〕 However, this classification was later questioned on the basis of several features of the holotype material, and as a result it is no longer considered to be within Protosuchia. Particular features of the posterior part of the cranium, the only material associated with the genus, suggest that ''Eopneumatosuchus'' may have close relations with Early Jurassic teleosaurs.〔Clark, J. M. and Fastovsky, D. E. (1989) Vertebrate biostratigraphy of the Glen Canyon Group in northern Arizona. ''In'' Padian, K. (ed.) ''The Beginning of the Age of Dinosaurs: Faunal Change Across the Triassic-Jurassic Boundary'' Cambridge: Cambridge University Press.〕 The large supratemporal fenestrae of ''Eopneumatosuchus'' are characteristic of longirostrine crocodilians. Despite the similar cranial morphology with crocodilians, the genus is currently regarded as a basal crocodyliform. Nonetheless, it is considered to be more derived than protosuchians such as ''Protosuchus'', found from the Moenave Formation, whose deposition preceded that of the Kayenta Formation. The basicranium had many cavities that made up a complex tympanic pneumatic system for which the genus has been named.〔Dufeau, D. L. and Witmer, L. M. (2007). Ontogeny and phylogeny of the tympanic pneumatic system of crocodyliform archosaurs. ''Journal of Morphology'' 268(12)〕 These types of cavities can also be seen in some protosuchians such as ''Protosuchus'' and ''Hemiprotosuchus'', although they are less elongated than in ''Eopneumatosuchus''. ==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「Eopneumatosuchus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.