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Dysomma opisthoproctus
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drawing shows typical species in Synaphobranchidae.
Teleostei (teleosts) >
Anguilliformes
(Eels and morays) >
Synaphobranchidae
(Cutthroat eels) > Ilyophinae
Etymology:
Dysomma:
Greek, dys, dyo = two + Greek, omma = eye
;
opisthoproctus:
Species name refers to its posterior positioned anus (Ref.
31561
)
.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Marine; demersal; depth range ? - 200 m (Ref.
31561
). Subtropical
Northwest Pacific: known only from Nan-Fong-Ao, northeastern Taiwan.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 42.1 cm TL male/unsexed; (Ref.
31561
)
Short description
Morphology
|
Morphometrics
Vertebrae
: 120. This species is distinguished by the following characters: with pectoral fin; dorsal-fin origin is in front of level of pectoral-fin base, predorsal length 10.6% TL; anus is posterior and far behind tip of pectoral fin, preanal length 35.1% TL; trunk is very long, trunk length 20.2% TL; intermaxillary teeth 2; compound teeth on vomer 4; multiple rows of small teeth on the upper jaw; a row of 7 or 8 large compound teeth on lower jaw; head pores: IO 4, SO 3, M 7, POP 0, AD 1; lateral-line pores: prepectoral 6, preanal 24, lateral line runs to more than 2 head length before caudal fin; 25 preanal vertebrae, 120 total vertebrae; colour of body brownish dorsally and paler ventrally with lower part of posterior margin of anal fin and caudal fin black (Ref.
31561
).
Maximum depth reported based on a single specimen (Ref.
31561
). Minimum depth from Ref. 58018.
Life cycle and mating behavior
Maturity
|
Reproduction
|
Spawning
|
Eggs
|
Fecundity
|
Larvae
Chen, Y.Y. and H.K. Mok
, 1995.
Dysomma opisthoproctus
, a new synaphobranchid eel (Pisces: synaphobranchidae) from the northeastern coast of Taiwan. Copeia 1995(4):927-931. (Ref.
31561
)
IUCN Red List Status (Ref.
130435
)
Data deficient (DD)
; Date assessed:
18 November 2019
CITES
Not Evaluated
Not Evaluated
Threat to humans
Harmless
Human uses
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Estimates based on models
Preferred temperature (Ref.
123201
): 19.4 - 23.7, mean 21.7 °C (based on 40 cells).
Phylogenetic diversity index (Ref.
82804
): PD
50
= 0.5001 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00102 (0.00046 - 0.00225), b=3.06 (2.88 - 3.24), in cm total length, based on all LWR estimates for this body shape (Ref.
93245
).
Trophic level (Ref.
69278
): 3.9 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153
): Low to moderate vulnerability (32 of 100).
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Page last modified by :
mrius-barile
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