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Eptatretus longipinnis, Longfinned hagfish
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Longfinned hagfish
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Myxini (hagfishes) >
Myxiniformes
(Hagfishes) >
Myxinidae
(Hagfishes) > Eptatretinae
Etymology:
Eptatretus:
hepta
(Gr.), seven;
tretos
(Gr.), perforated (i.e., with holes), referring to seven gill apertures on what would later be described as
Homea banksii
(=
E. cirrhatus
) [range within genus is 6-14 pairs of gill apertures]. (
See ETYFish
)
;
longipinnis:
longus
(L.), long;
pinnis
(L.) fins, referring to well-developed fold on ventral fins that extends to branchial region. (
See ETYFish
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; non-migratory; depth range 14 - 40 m (Ref.
85052
). Temperate
Eastern Indian Ocean: Off Robe and off Cape Douglas, South Australia.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 62.7 cm TL male/unsexed; (Ref.
85052
)
Short description
Morphology
|
Morphometrics
This species is distinguished from all its congeners by its ventral fin fold beginning anterior to the first pair of gill apertures (within anterior 27-28% TL) (Ref.
85052
).
Occurs on soft bottoms of the continental shelf (Ref.
7300
). Maximum depth from Ref. 58018.
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 ).
Fernholm, B.
, 1998. Hagfish systematics. p. 33-44. In J.M. Jørgensen, J.P. Lomholt, R.E. Weber and H. Malte (eds.) The biology of hagfishes. Chapman & Hall, London. 578 p. (Ref.
31276
)
IUCN Red List Status (Ref.
130435
)
Vulnerable (VU)
(B2ab(iii)); Date assessed:
10 November 2009
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 15 - 18.7, mean 17.4 °C (based on 24 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00204 (0.00092 - 0.00452), b=2.93 (2.73 - 3.13), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 4.2 ±0.41 se; based on food items.
Resilience (Ref.
120179
): Low, minimum population doubling time 4.5 - 14 years (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153
): Moderate to high vulnerability (45 of 100).
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