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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 Diplorrhina ： ウィキペディア英語版 Diplorrhina ''Diplorrhina'' is a genus of trilobites, a well known class of extinct marine arthropods. It lived during the early Middle Cambrian (Amgan and Mayan stages) in what are now the Czech Republic and the North Siberian plateau. Like all agnostina it has a headshield (or cephalon and tailshield (or pygidium of approximately the same shape and size (or isopygeous), and two thorax segments. Like other members of the Peronopsidae family, it lacks a furrow connecting the furrow surrounding the central raise area of the cephalon (or glabella) and the furrow that defines the border of the cephalon. Both the cephalon and the pygidium lack spines. It is difficult to distinguish from many other peronopsids. == Taxonomy == The ancestor of ''Diplorrhina'' is most likely one of the Siberian species of the genus ''Archaeagnostus''. ''D. recta'' is the most primitive species and it gave rise to ''D. cuneifera'', which was in turn ancestral to ''Diplorrhina triplicata''.〔 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「Diplorrhina」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.