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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 Etacystis ： ウィキペディア英語版 Etacystis ''Etacystis communis'', colloquially known as the H-animal or aitch, was a soft-bodied invertebrate that lived in shallow tropical coastal waters of muddy estuaries during the Pennsylvanian geological period, about 300 million years ago. Examples of ''Etacystis'' have been found only in the Mazon Creek fossil beds of Illinois, United States. ==Etymology== ''Etacystis communis'' takes its genus name from its shape, being roughly similar in shape to the letter "H". ''Eta'' is the Greek letter "H" while ''cystis'', from the Greek ''kystis'', means sac or bladder, referring to the organism's saclike bodyplan. The specific name refers to the relatively common occurrence of the animal in the Mazon Creek fossil beds. Only a single species has been described. 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「Etacystis」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.