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Nautilus (genus)
''Nautilus'' is a genus of cephalopods in the family Nautilidae. Species in this genus differ significantly in terms of morphology from those placed in the sister taxon ''Allonautilus''.〔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.〕 The oldest fossils of the genus are known from the Late Eocene Hoko River Formation, in Washington State and from Late-Eocene to Early Oligocene sediments in Kazakhstan. The oldest fossils of the modern species ''Nautilus pompilius'' are from Early Pleistocene sediments off the coast of Luzon in the Philippines.〔
The common term ''nautilus'' usually refers to any extant members of the Nautilidae family.
==Species==
Extinct species are denoted with a dagger (†).
* ''N. belauensis''
* †''N. cookanum''
* ''N. macromphalus''
* ''N. pompilius'' (type)
*
* ''N. p. pompilius''
*
* ''N. p. suluensis''
* †''N. praepompilius''
* ''N. stenomphalus''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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