|
Hymenocephalus yamasakiorum Nakayama, Endo & Schwarzhans, 2015 Black-tailed membranehead |
| Family: | Macrouridae (Grenadiers or rattails) | |||
| Max. size: | 15.1 cm TL (male/unsexed) | |||
| Environment: | bathydemersal; marine; depth range 380 - 420 m | |||
| Distribution: | Northwest Pacific: Japan. | |||
| Diagnosis: | This species is distinguished by the following characters: 9 pelvic-fin rays; chin barbel 55 % HL, its tip extending beyond vertical through hind margin of orbit when laid back; moderately high snout, not depressed, length 28 % HL; orbit diameter 33 % HL; interorbital width 24 % HL; preopercular supporter broad, short (5 % HL); D1 II,10; pectoral-fin rays i16-i17; gill rakers on first arch (outer/inner) 14/20, on second arch 20/19; pyloric caeca 15; when fresh the ventral two-thirds of head and body are silvery; dorsal half of posterior part of tail prominently dark; ventral half of tail completely immaculate; OL:OH = 1.15; ostial and caudal colliculi not fused; TCL:PCL = 2.3 (Ref. 100825). | |||
| Biology: | ||||
| IUCN Red List Status: | Not Evaluated (N.E.) Ref. (130435) | |||
| Threat to humans: | harmless | |||