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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 Libognathus ： ウィキペディア英語版 Libognathus ''Libognathus'' (meaning "southwest jaw" in Greek) is an extinct genus of procolophonid parareptile from the Late Triassic of Texas. The type and only species, ''Libognathus sheddi'', was named in 1997 from the Cooper Canyon Formation in the fossil-rich Post Quarry, which is found in Garza County. ''Libognathus'' was the first definite procolophonid discovered in the southwestern United States, although another possible procolophonid called ''Chinleogomphius'' was reported from the southwest before ''Libognathus'' was named. ==Description== ''Libognathus'' is known from a single holotype specimen including the left dentary bone and coronoid process of the lower jaw, as well as six teeth implanted in the jaw. ''Libognathus'' can be identified as a procolophonid by its wide molar-like teeth, each of which has a ridge running along its width and several projections or cusps around it. It is considered a member of the procolophonid subfamily Leptopleuroninae based on the presence of more conically-shaped teeth at the front of the jaw. ''Libognathus'' is distinguished from other procolophonids by the steep angle of the lower margin of the dentary (indicating a deeper lower jaw than in related procolophonids such as ''Hypsognathus'' and ''Leptopleuron'') and a small hole or foramen on the jaw's outer surface below the fifth tooth.〔 Several other jaw fragments have been identified as possible North American procolophonids, and have been given names such as ''Chinleogomphius'', ''Xenodiphyodon'', and ''Gomphiosauridion''. The holotype ''Libognathus'' can be distinguished from these other remains by features in its teeth; while ''Chinleogomphius'' and ''Xenodiphyodon'' have three cusps per tooth, ''Libognathus'' has only two, and while ''Gomphiodon'' has a ridge positioned centrally on the tooth surface, the ridge on each tooth of ''Libognathus'' is positioned farther forward.〔 Tooth replacement is evident on the inner surface of the jaw of ''Libognathus'', where the exposed roots of teeth show smaller teeth pushing up from underneath them. This form of tooth replacement is similar to that in most other reptiles, but different from the condition in most other procolophonids, which have teeth that are fused to the bone of the jaw.〔 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「Libognathus」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.