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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 Orthogenysuchus ： ウィキペディア英語版 Orthogenysuchus ''Orthogenysuchus'' is an extinct genus of caimanine alligatorid. Fossils have been found from the Wasatch Beds of the Willwood Formation of Wyoming, deposited during the early Eocene. The type species is ''O. olseni''. The holotype, known as AMNH 5178, is the only known specimen belonging to the genus and consists of a skull lacking the lower jaws. The braincase is filled in by the matrix and most of the suture lines between bones are indescernable, making comparisons with other eusuchian material difficult. ==Phylogeny== ''Orthogenysuchus'' was first named in 1924 by Charles C. Mook and was referred to as a eusuchian, although not to any particular eusuchian group known at the time. Later publications assigned the genus to Crocodylidae, but more recent analyses propose that it is a pristichampsid or even a synonym of ''Pristichampsus''. In 1999, ''Orthogenysuchus'' was placed within a new clade containing the Miocene caimanines ''Purussaurus'' and ''Mourasuchus''. ''Orthogenysuchus'' predates these genera by around 30 Ma, suggesting that they both had significant ghost lineages.〔 Furthermore, the 1999 study proposed a clade containing only ''Orthogenysuchus'' and ''Mourasuchus''. This clade is similar to the family Nettosuchidae, which was originally constructed in 1965 for ''Mourasuchus'' and the newly described ''Nettosuchus'' (later shown to be a junior synonym of the genus). However, the clade is based primarily on ambiguous characters as a result of the poor preservation of the holotype of ''Orthogenysuchus'', and thus has not yet been formally described. All unambiguous synapomorphies are based on the nasal region of the skull where the individual bones are easily distinguished. ''Orthogenysuchus'' shares with ''Mourasuchus'' a characteristically long, broad snout, extremely wide external nares consisting of the nasal aperture and dorsal fossa, and many small maxillary alveoli.〔 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「Orthogenysuchus」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.