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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 Phthinosaurus ： ウィキペディア英語版 Phthinosaurus ''Phthinosaurus'' is an extinct genus of therapsid from the Middle Permian of Russia. The type species ''Phthinosaurus borrisiaki'' was named by Soviet paleontologist Ivan Yefremov in 1940 on the basis of an isolated lower jaw. Because this jaw provides few distinguishing characteristics, the evolutionary relationships of ''Phthinosaurus'' are poorly known. Yefremov named the family Phthinosuchidae in 1954 to include ''Phthinosaurus'' and the newly named ''Phthinosuchus'', which was described on the basis of a crushed partial skull. American paleontologist Everett C. Olson placed both of these therapsids in the larger infraorder Phthinosuchia in 1961. In 1974 Leonid Tatarinov named the family Phthinosauridae to include ''Phthinosaurus'' alone, retaining ''Phthinosuchus'' within Phthinosuchidae. ''Phthinosaurus'' differs from ''Phthinosuchus'' in that it has a small coronoid process near where the lower jaw would attach to the rest of the skull. Tatarinov classified ''Phthinosaurus'' as a therocephalian in 1998, as therocephalians are known to have prominent coronoid processes. In 2008, Russian paleontologist M. F. Ivakhnenko noted that the tooth sockets angle slightly backward rather than directly upward as in ''Phthinosuchus'', and that the lower margin of the jaw is slightly convex. Both of these features were used as evidence for reclassifying ''Phthinosaurus'' as a rhopalodontid dinocephalian. ==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「Phthinosaurus」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.