View data on Catalog of Fishes here.
Dorsal-fin rays 12 (rarely 13); anal-fin rays 16–17; pectoral-fin rays (rarely 12 or 13) 14–16; gill rakers 22–24; vertebrae 33. Largest specimens have not exceeded 50 mm SL; body broad, tapering into long, relatively narrow caudal peduncle; its length equal to or greater than its greatest depth; post-temporal spine rather long and needlelike, its length about one-fourth the orbital diameter; dorsal spine short; preopercle spine short, triangulate; abdominal keel scales smooth, with no ventral extension; first supra-abdominal photophore raised above second which is equal to or slightly raised above third; supra-anal photophores in steplike arrangement, the third being highest; first three anal photophores even and parallel to midline; jaws medium; teeth present on long posterior shaft of vomer lying ventral to parasphenoid, resulting in three distinct tooth bearing areas on the vomer; gill rakers medium; in preservative, dorsal pigment bar is extremely narrow and reaches to midline; dorsal pigment border is broken by light shape behind pigment bar, reaching broadly to mid-dorsal line; dorsal pigment border raised slightly above supra-anal photophores; small, dark pigment spots mark lateral midline.
Post-temporal spine simple, bearing no basal spines; lateral edge of post-temporal-supracleithrum smooth; keel scales with smooth ventral surfaces; supraanal photophores separate, usually raised well above anal group. Post-temporal spine short, its length less than one-fourth the diameter of orbit; anal photophore number 7 to 9 (occasionally 10); body robust, less than 1.9 times body depth; first supra-anal photophore markedly lower than second. Teeth present on posterior vomerine shaft; second supra-anal photophore lower than third; supra-abdominal photophores symmetrical, first not markedly raised above third. Gill rakers 22 to 24; dark pigment bar extending to midline very narrow, its width less than greatest width of lateral photophore.
Northwest and North Pacific; abundant in the waters off Japan in the North Pacific.
Baird RC. 1971. The Systematics, Distribution, and Zoogeography of the Marine Hatchetfishes (family Sternoptychidae). Bulletin of the Museum of Comparative Zooology 142(1):1–128.
Baird RC. 1971. The Systematics, Distribution, and Zoogeography of the Marine Hatchetfishes (family Sternoptychidae). Bulletin of the Museum of Comparative Zooology 142(1):1–128.
Rarely larger than 50 mm SL.
Kumano-Nada, Japan [Western North Pacific].
Holotype: USNM 179793
Polyipnus matsubarai is a species of ray-finned fish in the genus Polyipnus.[1] Its standard length is 9.7 cm and lives at a depth of 240 metres.[2] They inhabit the waters around Japan, the Philippine Sea, and Hawaiian-Emperor Seamounts.[3]
{{cite web}}: CS1 maint: url-status (link) Polyipnus matsubarai is a species of ray-finned fish in the genus Polyipnus. Its standard length is 9.7 cm and lives at a depth of 240 metres. They inhabit the waters around Japan, the Philippine Sea, and Hawaiian-Emperor Seamounts.
