Polyipnus

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Superordo: Stenopterygii
Ordo: Stomiiformes
Subordo: Gonostomatoidei

Familia: Sternoptychidae
Subfamilia: Sternoptychinae
Genus: Polyipnus
Species: P. aquavitus – P. asper – P. asteroides – P. bruuni – P. clarus – P. danae – P. elongatus – P. fraseri – P. indicus – P. inermis – P. kiwiensis – P. laternatus – P. latirastrus – P. limatulus – P. matsubarai – P. meteori – P. notatus – P. nuttingi – P. oluolus – P. omphus – P. ovatus – P. parini – P. paxtoni – P. polli – P. ruggeri – P. soelae – P. spinifer – P. spinosus – P. stereope – P. surugaensis – P. tridentifier – P. triphanos – P. unispnus
Name

Polyipnus Günther, 1887
References
Primary references

Günther, A. 1887. Report on the deep-sea fishes collected by H. M. S. Challenger during the years 1873–76. Report on the Scientific Results of the Voyage of H. M. S. Challenger 22 (pt 57): 170.

Polyipnus is a genus of oceanic ray-finned fish in the family Sternoptychidae. This is the largest genus of the marine hatchetfishes subfamily 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.[2]

Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago.[1]
Species

There are currently 33 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 (comb-side hatchetfish)
Polyipnus limatulus Harold & Wessel, 1998
Polyipnus matsubarai L. P. Schultz, 1961
Polyipnus meteori Kotthaus, 1967
Polyipnus notatus Harold, I. M. Kemp & Shore, 2016 [3]
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 (round hatchetfish)
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 (three-light hatchetfish)
Polyipnus unispinus L. P. Schultz, 1938

References

Sepkoski, J.J.Jr (2002). "A Compendium of Fossil Marine Animal Genera". Bulletins of American Paleontology. 363: 1–560.
Froese, Rainer and Pauly, Daniel, eds. (2016). Species of Polyipnus in FishBase. January 2016 version.
Harold, A.S., Kemp, I.M. & Shore, S.K. (2016): A new species of Polyipnus (Teleostei: Stomiiformes) from the western Pacific, with comments on the P. triphanos species complex. Zootaxa, 4111 (5): 555–564.