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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 Monograptus ： ウィキペディア英語版 Monograptus ''Monograptus'' is a genus of the Order Graptoloidea. This particular genus is the last stage of the graptoloid evolution before its extinction in the early Devonian. A characteristic of the genus includes one uniserial stipe with very elaborate thecae. This particular genus contains large number of graptolite species and may not be monophyletic. == Biostratigraphic significance == The International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum (FAD) of ''Monograptus uniformis'' as the defining biological marker for the start of the Lochkovian, 419.2 ± 3.2 million years ago, the earliest stage of the Devonian.〔(Gradstein, F. M. et al. ''ICS on Stage'' ), page 5. Retrieved 2015-06-16.〕 ICS has assigned the FAD of ''Monograptus parultimus'' defining biological marker for the start of the Pridoli epoch, 423.0 ± 2.3 million years ago, of ''Monograptus turriculatus'' (together with the replacement of the brachiopod ''Eocoelia intermedia'' with ''E. curtisi'') for the start of the Telychian, 438.5 ± 1.1 million years ago, and of ''Monograptus austerus sequens'' for the start of the Aeronian, 440.8 ± 1.2 million years ago, all stages of the Silurian. 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「Monograptus」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.