Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Gadiformes
(Cods) > Macrouridae
(Grenadiers or rattails) > Macrourinae
Etymology: Hymenocephalus: Named for its transparent membrane-like head covering (‘‘hymen head’’) and fragile nature of head bones (Ref. 100825). More on authors: Gilbert & Cramer.
Environment: milieu / climate zone / depth range / distribution range
Marine; benthopelagic; depth range 450 - 799 m (Ref. 58302). Deep-water
Eastern Central Pacific: Hawaiian Islands.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Morphology | Morphometrics
This species is distinguished by the following characters: pelvic fin rays 11-12 (usually 12); pectoral fin rays 13-15 (seldom 16); short projecting snout, 15-18% HL; short barbel, 3-4% HL, large orbit diameter, 35-40% HL; infraorbital width 8-10% HL; moderately long preopercular supporter, with obtuse angle at rear margin, 5-7% HL; 21-24 gill rakers; ventral striae reaching to ½ distance from pelvic fin bases to periproct; otolith has high predorsal lobe, with colliculi separated, closely placed across collum, with occasional tendency to partly join, terminating at some distance from anterior and posterior rims of otolith; otolith length to height (OL:OH), 0.95-1.1; total colliculum length to pseudocolliculum length (TCL:PCL), 1.6-1.7 (Ref. 98298).
Benthopelagic (Ref. 58302).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Sazonov, Y.I. and T. Iwamoto, 1992. Grenadiers (Pisces, Gadiformes) of the Nazca and Sala y Gomez ridges, southeastern Pacific. Proc. Calif. Acad. Sci. 48(2):27-95. (Ref. 9949)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 4.7 - 6.8, mean 5.6 (based on 4 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00224 (0.00097 - 0.00516), b=3.16 (2.97 - 3.35), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.3 ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (33 of 100) .