Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Myxini (hagfishes) > Myxiniformes
(Hagfishes) > Myxinidae
(Hagfishes) > Eptatretinae
Etymology: Eptatretus: Greek, epta = seven + Greek, tretos, -e, -on = with holes (Ref. 45335); bobwisneri: Named after Robert L. Wisner, for his valuable assistance with C.B. McMillan's myxinid research as well as his other contributions to ichthyology.
Environment / Climate / Range
Marine; bathydemersal; non-migratory; depth range 512 - 563 m (Ref. 31788). Deep-water, preferred ?
Southeast Pacific: known only from the Galapagos Islands (Ref. 31788).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 32.8 cm TL male/unsexed; (Ref. 31788); 35.6 cm TL (female)
Morphology | Morphometrics
Eight gills and apertures on each side, last gill aperture on left side confluent with the pharyngocutaneous duct; 10 multicusps, pattern of 3 fused cusps in each anterior row and 2 in each posterior row; unicusps 9 each anterior and 8 each posterior row; total cusps 44; total slime pores 76, prebranchial pores 9, branchial pores 7, trunk pores 46-47, tail pores 13-14; face mostly white, including mouth and base of labial barbels; other barbels dark, with occasional white spots or tips; eye spots distinct, large and irregularly shaped; ventral finfold vestigial or absent; caudal finfold well developed (Ref. 31788).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Copulatory organ absent. The gonads of hagfishes are situated in the peritoneal cavity. The ovary is found in the anterior portion of the gonad, and the testis is found in the posterior part. The animal becomes female if the cranial part of the gonad develops or male if the caudal part undergoes differentiation. If none develops, then the animal becomes sterile. If both anterior and posterior parts develop, then the animal becomes a functional hermaphrodite. However, hermaphroditism being characterised as functional needs to be validated by more reproduction studies (Ref. 51361 ).
McMillan, C.B., 1999. Three new species of hagfish (Myxinidae, Eptatretus) from the Galápagos Islands. Fish. Bull. 97:110-117. (Ref. 31788)
IUCN Red List Status (Ref. 109396)
CITES (Ref. 94142)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00204 (0.00093 - 0.00448), b=2.93 (2.74 - 3.12), based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 4.2 ±0.5 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (26 of 100) .