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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 Gyrometopus ： ウィキペディア英語版 Gyrometopus ''Gyrometopus'' is an extinct genus from a well-known class of fossil marine arthropods, the trilobites. It lived during the Arenig stage of the Ordovician Period, approximately 479 to 472 million years ago. == Description == The central raised area (or glabella) is flattened and its front is slightly expanded. The are 3 pairs of faint and narrow furrows that define lateral lobes. The lip (or rostral plate), the part of the doublure on the midline, is semicircular and the left and right sutures connect before reaching the inner margin of doublure. The articulate midlength part of the exoskeleton (or thorax) has 11 segments, which are divided by narrow pleural furrows. The margin of the tailshield (or pygidium) is entire, and the frontal two segments are well-defined by narrow pleural and interpleural furrows. 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「Gyrometopus」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.