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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 Otodus ： ウィキペディア英語版 Otodus ''Otodus'' is an extinct genus of mackerel shark which lived during the Paleocene and Eocene epochs, approximately 60 to 45 million years ago. The name ''Otodus'' comes from Greek ''ὠτ (oûs "ear")'' and ''ὀδούς, "odous (tooth)"'', or "ear-shaped tooth". ==Known physiology== This shark is known from the fossil teeth and fossilized vertebral centra. Like other elasmobranchs, the skeleton of ''Otodus'' was composed of cartilage and not bone, resulting in relatively few preserved skeletal structures appearing within the fossil record. The teeth of this shark are large with triangular crown, smooth cutting edges, and visible cusps on the roots. Some ''Otodus'' teeth also show signs of evolving serrations.〔 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「Otodus」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.