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


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