View data on Catalog of Fishes here.
Description. Dorsal-fin rays 12–13 (rarely 14); anal-fin rays 13–15; pectoral-fin rays 12–13; gill rakers (rarely 11) 12–14; vertebrae 34 (rarely 35–36). Small, possibly a "dwarf" species, none yet exceeding 40 mm SL; body narrow, tapering into long narrow trunk and caudal peduncle; post-temporal spine long, almost equal to orbital diameter; dorsal spine long, high; its length about equal to one-half of orbital diameter; preopercle spine long, greater than one-half of orbital diameter; a well-developed second preopercle spine usually present; dorsal lateral surface of preopercle spinose; abdominal keel scales spinose ventrally; postabdominal and anal pterygiophore spines well developed; supra-anal photophores almost continuous with anals; first two supra-anals raised markedly above third; distance between subcaudal and anal photophores less or equal to one-fourth the length of the latter; small; teeth minute; vomerine teeth prominent; gill rakers short to medium, well spaced; in preservative pigment slightly darker dorsally; abdomen and trunk relatively dark.
Post-temporal spine simple, bearing no basal spines; lateral edge of post-temporal-supracleithrum smooth; supraanal photophores separate, usually raised well above anal group. Post-temporal spine long, its length greater than one-fourth the diameter of orbit; anal photophore number 10 to 13 (adults only); body long and narrow, greater than 1.7 times body depth; first supra-anal photophore even with or raised above the second. Gill rakers 11 to 14; supra-anal photophores not markedly raised above anal group; preopercle spine long and slender. Posterior lateral margin of preopercle serrate; ventral edge of keel scales with small spinelets; dorsal spine long, length greater than one-half diameter of orbit.
Taken in small numbers off the Philippines and in the Tasman and Coral Seas.
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.
To about 40 mm SL.
Philippines, 13°22'22"N, 124°00'48"E, Albatross station 5451, depth 380 fathoms.
Holotype: USNM 103153 [or 103353]
Polyipnus unispinus is a species of ray-finned fish in the genus Polyipnus. It lives in deep water environments in the Western Pacific Ocean.[1]
Polyipnus unispinus is a species of ray-finned fish in the genus Polyipnus. It lives in deep water environments in the Western Pacific Ocean.
