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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 Phoenixites ： ウィキペディア英語版 Phoenixites ''Phoenixites'' is an early (Late Devonian), genus of the Falcitornoceratinae, a subfamily of the goniatitid Tornoceratidae family. This genus was named by Becker in 1995. The type species is ''"Tornoceras" frechi''. The shell of ''Phoenixites'' is discoidal, on which constrictions may be present. Growth lines are strongly biconvex in juvenile stages, later with shallow a lateral sinus. ''Phoenixites'' may have contained the ancestor of ''Falcitornoceras'' which likely gave rise to ''Gundolficeras'', all members of the Falcitornoceratinae. == Biostratigraphic significance == The International Commission on Stratigraphy (ICS) has assigned the First Appearance Datum of ''Phoenixites frechi'' as the defining biological marker for the start of the Famennian Stage, 372.2 ± 1.6 million years ago, the final stage of the Devonian. This lower limit is also defined by the Upper Kellwasser Extinction, when the conodont genera ''Ancyrodella'', and ''Ozarkodina'' and many species of ''Palmatolepis'', ''Polygnathus'', and ''Ancyrognathus'' disappeared. 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「Phoenixites」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.