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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 Biceratops ： ウィキペディア英語版 Biceratops ''Biceratops'' is an extinct genus of trilobites, fossil marine arthropods, of average size (largest specimen long), not including the huge pleural spines of the 3rd segment of the thorax. It lived during the Toyonian stage (last phase of the Upper ''Olenellus''-zone), in what is today the South-Western United States. ''Biceratops'' can easily be distinguished from other trilobites by the absence of genal spines, in combination with effaced features of the raised axial area of the head shield (or glabella), that is bordering the two horn-like projections that carry the eyes. ''Biceratops nevadensis'' is the only known species in this genus (i.e. the genus is monotypic). == Etymology == The name of the genus is derived from Latin and means ‘two horned-eyes’. The species epithet refers to the US state where it was collected.〔 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「Biceratops」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.