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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 Erettopterus ： ウィキペディア英語版 Erettopterus ''Erettopterus'' is a genus of prehistoric eurypterid.〔(【引用サイトリンク】title=The Paleobiology Database )〕 It was related to another large eurypterid, ''Pterygotus''. ==Description== Pterygotidae, which lived from the Ordovician to Devonian periods, were characterized by small to large exoskeletons with semilunar scales. The telson, (tail) was expanded, or flatter than it was tall. Pterygotidae also had chelicerae (claws in front of the mouth) that were large and long, with strong, well developed teeth on the claws. Their walking legs were small and slender, without spines.〔 1955. Merostomata. ''Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata'', P: 30.〕 ''Erettopterus'' is distinguishable from other Pterygotidae by its telson, which is bilobed. The distal margins of the chelicerae are angular. The prosoma (head) is semielliptical, with compound eyes located at the edge.〔 1955. Merostomata. ''Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata'', P: 31.〕 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「Erettopterus」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.