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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 Tetragraptus approximatus ： ウィキペディア英語版 Tetragraptus approximatus ''Tetragraptus approximatus'' is a species of dichograptid graptolite belonging to the genus ''Tetragraptus''. It existed during the Floian Age ( million years ago) of the Ordovician. It is an important index fossil in biostratigraphy. ==Description== The general outline of each ''Tetragraptus approximatus'' colony (rhabdosome) is highly distinctive. It resembles a long narrow letter H or X. The central process (the funicle) is about long, each end bifurcating at right angles with each other. Each pair of branches (stipes) curve away sharply from the ends of the funicle then run more or less parallel with each other at a distance of apart. Each of the stipes can reach more than in length, with approximately ten cup-like structures (thecae) for every of the stipes. The thecae are tilted at a 45° angle to the axis.〔 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「Tetragraptus approximatus」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.