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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 Somalinautilus ： ウィキペディア英語版 Somalinautilus ''Somalinautilus'' is a genus of nautiloid that is found in the Middle to Upper Jurassic of England, France, and Somalialand. The genus contains three species, ''S. antiquus'', first assigned to ''Nautilus'' by Dacque in 1910, ''S. fuscus'', first assigned to ''Nautilus'' in 1898, and ''S. clausus'', first used under ''Nautilus'' in 1890. Another species of ''Nautilus'' was named in 1905, ''N. bisculatus'', which is now a synonym of ''S. antiquus''.〔 Two features that differentiate ''Somalinautilus'' are that the venter is arched and low, and its ventral shoulders are subangular. This distinguishes ''Somalinautilus'' from its close relatives ''Paracenoceras'', ''Tithonoceras'', and ''Aulaconautilus''. ''Tithonoceras'' is closest related to ''Paracenoceras'' within the group, and the three other genera are all descended from the groups sister taxa. In 1927 the family Paracenoceratidae was named to house these four genera, and in 1956, the family was then downgraded to a subfamily within Nautilidae.〔 However, the group is now considered to be a family again.〔 ==References== 〔 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「Somalinautilus」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.