Holocephali (chimaeras) > Chimaeriformes
(Chimaeras) > Chimaeridae
(Shortnose chimaeras or ratfishes)
Etymology: Hydrolagus: Greek, hydr = water + Greek, lagos = hare (Ref. 45335); melanophasma: The specific name is derived from melano- (Greek prefix) meaning black and –phasma (Greek noun) meaning specter or spirit. Vernacular: Eastern Pacific Black Ghostshark
Environment: milieu / climate zone / depth range / distribution range
Marine; benthopelagic; depth range 2 - 1720 m (Ref. 93040), usually 565 - 1720 m (Ref. 93040). Subtropical; 0°C - ; 35°N - 40°S, 125°W - 70°W (Ref. 93040)
Eastern Pacific Ocean: From Baja California, Mexico to Validivia, Chile.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 120 cm TL male/unsexed; (Ref. 82286)
Morphology | Morphometrics
A species of the genus Hydrolagus based on the absence of an anal fin. Hydrolagus
melanophasma sp. nov. is distinguished from other chimaeroids by a blunt snout with minimal sloping from the orbit to the snout tip, a large slightly curved dorsal fin spine (25.9 % BDL) extending beyond first dorsal fin apex, and a long second dorsal fin (77.3–81.1% BDL) of uniform height throughout. The pectoral fins are large, reaching beyond the pelvic fin insertion when laid flat, trifid claspers forked for 27–27.8% of the total clasper length and the preopercular and oral lateral line canals branch separately or together from the infraorbital canal. Coloration after preservation is a uniform black with no distinct mottling or markings (Ref. 82286).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
James, K.C., D.A. Ebert, D.J. Long and D.A. Didier, 2009. A new species of chimaera, Hydrolagus melanophasma sp. nov. (Chondrichthyes: Chimaeriformes: Chimaeridae), from the eastern North Pacific. Zootaxa 2218:59-68. (Ref. 82286)
IUCN Red List Status (Ref. 124695)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 2.6 - 6.5, mean 3.9 °C (based on 154 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00282 (0.00118 - 0.00673), b=3.10 (2.89 - 3.31), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 3.9 ±0.6 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): High vulnerability (63 of 100) .
Nutrients (Ref. 124155
): Calcium = 34.1 [6.5, 101.1] mg/100g ; Iron = 0.786 [0.263, 2.171] mg/100g ; Protein = 16.8 [11.3, 20.0] % ; Omega3 = 0.231 [0.114, 0.473] g/100g ; Selenium = 30.5 [4.2, 87.8] μg/100g ; VitaminA = 9.92 [3.21, 29.23] μg/100g ; Zinc = 0.737 [0.388, 1.879] mg/100g (wet weight);