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Polyipnus
''Polyipnus'' is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the largest genus of the marine hatchetfishes (Sternoptychinae) and indeed of the entire Sternoptychidae. It is not quite as apomorphic as their relatives; it may be that the genus is actually a paraphyletic assemblage of less advanced Sternoptychinae and would need to be split.
== Species ==
There are currently 32 recognized species in this genus:
* '' Polyipnus aquavitus'' R. C. Baird, 1971 (Aquavit Hatchetfish) * '' Polyipnus asper'' Harold, 1994* '' Polyipnus asteroides'' L. P. Schultz, 1938* '' Polyipnus bruuni'' Harold, 1994* '' Polyipnus clarus'' Harold, 1994 (Slope Hatchetfish) * '' Polyipnus danae'' Harold, 1990* '' Polyipnus elongatus'' Borodulina, 1979* '' Polyipnus fraseri'' Fowler, 1934* '' Polyipnus indicus'' L. P. Schultz, 1961* '' Polyipnus inermis'' Borodulina, 1981* '' Polyipnus kiwiensis'' R. C. Baird, 1971 (Kiwi Hatchetfish) * '' Polyipnus laternatus'' Garman, 1899* '' Polyipnus latirastrus'' Last & Harold, 1994 (Combside Hatchetfish) * '' Polyipnus limatulus'' Harold & Wessel, 1998* '' Polyipnus matsubarai'' L. P. Schultz, 1961* '' Polyipnus meteori'' Kotthaus, 1967* '' Polyipnus nuttingi'' C. H. Gilbert, 1905 (Nutting's Hatchetfish) * '' Polyipnus oluolus'' R. C. Baird, 1971* '' Polyipnus omphus'' R. C. Baird, 1971* '' Polyipnus ovatus'' Harold, 1994* '' Polyipnus parini'' Borodulina, 1979* '' Polyipnus paxtoni'' Harold, 1989 (Paxton's Hatchetfish) * '' Polyipnus polli'' L. P. Schultz, 1961* '' Polyipnus ruggeri'' R. C. Baird, 1971 (Rugby Hatchetfish) * '' Polyipnus soelae'' Harold, 1994 (Soela Hatchetfish) * '' Polyipnus spinifer'' Borodulina, 1979* '' Polyipnus spinosus'' Günther, 1887 (Spiny Hatchetfish) * '' Polyipnus stereope'' D. S. Jordan & Starks, 1904* '' Polyipnus surugaensis'' Aizawa, 1990* '' Polyipnus tridentifer'' McCulloch, 1914 (Three-spined Hatchetfish) * '' Polyipnus triphanos'' L. P. Schultz, 1938 (Threelight Hatchetfish) * '' Polyipnus unispinus'' L. P. Schultz, 1938
Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago.〔 (2002): (). ''In:'' A compendium of fossil marine animal genera. ''Bulletin of American Paleontology'' 364: 560. (HTML database excerpt )〕
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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