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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 Ctenopterus ： ウィキペディア英語版 Ctenopterus ''Ctenopterus'' is a genus of prehistoric eurypterid of the Family Stylonuridae. It contains only one species. ==Description== Stylonurids, which lived from the Ordovician to Lower Permian periods, were small to very large forms with scales developing into tubercules and knobs. The prosoma (head) exhibited variable shape, with arcuate compound eyes located subcentrally, or anteriorly. Their abdomens were slender. Their walking legs were long and powerful, sometimes characterized by spines. Most genera did not have swimming legs.〔 1955. Merostomata. ''Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata'', P36.〕 ''Ctenopterus'' is distinguished by its prosoma (head), which narrows towards the front. All of its legs are walking legs; the second and third pairs are strongly developed, with a double row of numerous flat spines; the last pair is long, without spines. ''Ctenopterus'' date from the Silurian to the Devonian periods.〔 1955. Merostomata. ''Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata'', P38.〕 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「Ctenopterus」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.