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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 Nautilus praepompilius ： ウィキペディア英語版 Nautilus praepompilius ''Nautilus praepompilius'' is an extinct species of nautilus. It lived during the Late Eocene through Oligocene epochs. Fossil specimens have been uncovered from the Chegan Formation of Kazakhstan. ''N. praepompilius'' has been grouped into a single taxon together with extant species based on their shared shell characters. It is morphologically closest to ''N. pompilius'', hence the name. The nepionic constriction shows that the hatching size was approximately 23 mm, close to that for ''N. pompilius'' (around 26 mm).〔Ward, P.D. & W.B. Saunders 1997. (''Allonautilus'': a new genus of living nautiloid cephalopod and its bearing on phylogeny of the Nautilida ). ''Journal of Paleontology'' 71(6): 1054–1064.〕 ''N. praepompilius'', along with aff. ''N. cookanum'' fossils from the late Eocene Hoko River Formation in Washington state are the oldest occurrences of the genus. ==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「Nautilus praepompilius」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.