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Pleuronectiformes (Flatfishes) >
Cynoglossidae (Tonguefishes) > Symphurinae
Etymology: Symphurus: Greek, syn, symphysis = grown together + Greek, oura = tail (Ref. 45335); megasomus: Name derived from the Greek, 'mega' for large, and 'somus' for body, referring to the large size of this species and the deep body without obvious tapering in the posterior body.
Miljö: miljö / Klimatzon / djupintervall / distributionsområde
Ekologi
marina bentopelagisk; djupintervall 200 - 640 m (Ref. 82423). Subtropical
Utbredning
Territorier | FAO områden | Ekosystem | Förekomster | Prickkarta | Utplanteringar | Faunafri
Northwest Pacific: Taiwan.
Längd vid första mognad / Storlek / Vikt / Ålder
Könsmognad: Lm 12.3, range 10 - 14.34 cm
Max length : 14.7 cm SL hane/ej könsbestämd; (Ref. 82423); 14.3 cm SL (female)
Kort beskrivning
Bestämningsnycklar | Morfologi | Morfometri
Mjukstrålar i ryggfenan (totalt) : 106 - 111; Mjukstrålar i analfenan: 91 - 96; Ryggkotor: 55 - 58. This species is distinguished from all its congeners, except S. hondoensis and S. undatus, by its predominant 1-2-3-2-2 ID pattern. It also differs from both abovementioned species in having smaller eye (5.3-7.9% HL vs. 11.0-14.9% HL in S. hondoensis and 11.5-13.8% HL in S. undatus). This species further differs from S. hondoensis
in having 9 abdominal vertebrae (vs. 10). S. megasomus is also distinguished from S. undatus, by having higher fin-ray counts, 106-111 dorsal-fin rays and 91-96 anal-fin rays (vs. 101-105 dorsal-fin rays and 87-91 anal-fin rays) and a uniform straw-colored to dark brown ocular-side coloration (vs. freckled ocular-side pigmentation) (Ref. 82423).
Body shape (shape guide): short and / or deep.
This deep-water tonguefish species is known only from the continental shelf and upper continental slope off northeastern and eastern Taiwan; from 471-640 m by research vessels. Polychaetes, small crustaceans and some unidentified detritus were found in the digestive systems of fishes examined. Little else is known regarding the biology of this species (Ref. 82423).
Livscykel och parningsbeteende
Könsmognad | Reproduktion | Lek | Ägg | Fekunditet | Larver
Lee, M.-Y., H.-M. Chen and K.-T. Shao, 2009. A new species of deep-water tonguefish genus Symphurus (Pleuronectiformes: Cynoglossidae) from Taiwan. Copeia 2009(2):342-347. (Ref. 82423)
Status på IUCN:s rödlista (Ref. 130435: Version 2025-2 (Global))
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Uppskattningar baserade på modeller
Önskad temperatur (Ref.
123201): 9.6 - 16.7, mean 12.5 °C (based on 17 cells).
Index för fylogenetisk mångfald (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00912 (0.00437 - 0.01903), b=3.13 (2.95 - 3.31), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Trofisk nivå (Ref.
69278): 3.3 ±0.4 se; based on size and trophs of closest relatives
Resiliens (Ref.
120179): Hög, lägsta populationsfördubblingstid mindre än 15 månader (Preliminary K or Fecundity.).
Sårbarhet i fisket (Ref.
59153): Low vulnerability (10 of 100).
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