翻訳と辞書 Words near each other ・ Hyblaea ・ Hyblaea constellata ・ Hyblaea ibidias ・ Hyblaea puera ・ Hyblaea synaema ・ Hyblaean Mountains ・ Hyblaeidae ・ Hybo ・ Hybochelus ・ Hybochelus cancellatus ・ Hybochelus fossulatus ・ Hybodera debilis ・ Hybodera tuberculata ・ Hyboderini ・ Hybodontidae ・ Hybodontiformes ・ Hybodus ・ Hybogasteraceae ・ Hybognathus ・ Hybognathus hankinsoni ・ Hybognathus hayi ・ Hybognathus nuchalis ・ Hybognathus placitus ・ Hybognathus regius ・ Hybolasiellus variegatus ・ Hybolasiopsis abnormalis ・ Hybolasius ・ Hyboloma ・ Hyboma ・ Hybomitra Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Hybodontiformes ： ウィキペディア英語版 Hybodontiformes Hybodontiformes, also called hybodonts, are an extinct subset of Elasmobranchii (sharks, skates and rays) which existed from the Devonian to the Cretaceous. They form the group of sharks just outside the neoselachians, which is the clade of modern sharks and rays. Hybodonts were named and are distinguished based on their conical tooth shape. They comprised the main group of Jurassic sharks in Europe and North America. They survived into the Late Cretaceous before going extinct, possibly due to competition from other sharks. ''Lonchidion'' was one of the last hybodonts— its distinctive serrated fine spines occur in freshwater deposits from Wyoming alongside the fossils of the last dinosaurs, including ''Tyrannosaurus rex'' and ''Triceratops''.Hybodontiformes are identified in the fossil record predominantly based on distinct teeth and fin spines. They were known to live in both fresh and salt water environments. ==Etymology== The term hybodont comes from the Greek word ''ὕβος'' or ''ὑβός'' meaning hump or hump-backed and ''ὀδούς, ὀδοντ'' meaning tooth. This name was given based on their conical compressed teeth. 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「Hybodontiformes」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.