Sternoptyx

Sternoptyx; Temporal range: Early Oligocene to Present; 40–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Diaphanous hatchetfish (S. diaphana)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Stomiiformes
Family:	Sternoptychidae
Subfamily:	Sternoptychinae
Genus:	Sternoptyx; Hermann, 1781

Sternoptyx is an oceanic ray-finned fish genus which belongs in the family Sternoptychidae. This is the type genus of the Sternoptychidae, as well as the marine hatchetfish subfamily Sternoptychinae.

Sternoptyx have silvery, high, and laterally compressed bodies and large, non-telescopic eyes.^[1] They are all relatively small, with even the largest species (S. pseudobscura and S. pseudodiaphana) not exceeding 60 millimetres (2.4 in) standard length.^[2]

Species

There are currently four recognized species in this genus:^[2]

Sternoptyx diaphana Hermann, 1781 (Diaphanous hatchetfish)
Sternoptyx obscura Garman, 1899
Sternoptyx pseudobscura R. C. Baird, 1971 (Highlight hatchetfish)
Sternoptyx pseudodiaphana Borodulina, 1977 (False oblique hatchetfish)

Fossils of this genus show that they have existed at least since the Early Oligocene, about 30 million years ago.^[3]

References

^ Baird, R. C. (1971). "The systematics, distribution, and zoogeography of the marine hatchetfishes (family Sternoptychidae)". Bulletin of the Museum of Comparative Zoology. 142: 1–128.
^ ^a ^b Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Sternoptyx in FishBase. February 2012 version.
^ Sepkoski, Jack (2002): . In: A compendium of fossil marine animal genera. Bulletins of American Paleontology 364: 560. HTML database excerpt

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[Baird-1] Baird, R. C. (1971). "The systematics, distribution, and zoogeography of the marine hatchetfishes (family Sternoptychidae)". Bulletin of the Museum of Comparative Zoology. 142: 1–128.

[fishbase-2] Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Sternoptyx in FishBase. February 2012 version.

[3] Sepkoski, Jack (2002): . In: A compendium of fossil marine animal genera. Bulletins of American Paleontology 364: 560. HTML database excerpt

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Sternoptyx Temporal range: Early Oligocene to Present 40–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N

Diaphanous hatchetfish (S. diaphana)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Stomiiformes
Family:	Sternoptychidae
Subfamily:	Sternoptychinae
Genus:	Sternoptyx Hermann, 1781