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Nautilus cookanum : ウィキペディア英語版 | Nautilus cookanum
''Nautilus cookanum'' is an extinct species of nautilus. It lived during the Eocene epoch. ''N. cookanum'' has been grouped into a single taxon together with extant species based on their shared shell characters.〔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.〕 Fossils of the species from the Late Eocene Hoko River Formation are noted as one of the two oldest occurrences for 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 cookanum」の詳細全文を読む
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