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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 Parexus ： ウィキペディア英語版 Parexus ''Parexus'' is an extinct genus of acanthodian fish. Acanthodians are often referred to as ‘spiny sharks’, although acanthodians are not true sharks and evolved perhaps 50 million years earlier than sharks. Acanthodians share several features with bony fish and cartilaginous fish; they often have spines supporting their fins. ''Parexus'' is recognised by its large anterior dorsal fin spine. Several fossils have been discovered from the Early (Lower) Devonian Period of Tillywhandland, Scotland. Two species were described, ''P. recurvus'' and ''P. falcatus'', both from Scotland; according to Burrow ''et al.'' (2013) ''P. falcatus'' is in fact a junior synonym of ''P. recurvus''.〔 ==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「Parexus」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.