Classification / Names
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Pleuronectiformes (Flatfishes) >
Cynoglossidae (Tonguefishes) > Symphurinae
Etymology: Symphurus: Greek, syn, symphysis = grown together + Greek, oura = tail (Ref. 45335); robustus: Name from Latin 'robustus' meaning robust, referring to the relatively massive, and much thicker body of this species compared with that of other similar shallow-water tonguefishes.
Environment: milieu / climate zone / distribuzione batimetrica / distribution range
Ecologia
marino demersale; distribuzione batimetrica 45 - 90 m (Ref. 126065), usually 45 - 64 m (Ref. 126065). Subtropical
Norhwestern Pacific: Japan.
Length at first maturity / Size / Peso / Age
Maturità: Lm ?, range 5 - 6.3 cm
Max length : 6.6 cm SL maschio/sesso non determinato; (Ref. 126065); 6.8 cm SL (female)
Raggi dorsali molli (totale) : 85 - 88; Raggi anali molli: 72 - 76; Vertebre: 47 - 49. distinguished from all congeners by the combination of: ID pattern1-2-2-2-2; caudal-fin rays 12; vertebrae abdominal 9 (3 + 6). total 47-49; hypurals 4; D 85-88, A 72-76; longitudinal scale rows 78-88; transverse scale rows 31-34; scale rows on head posterior to lower orbit 16-18; body moderately wide (BD = 25.5-28.3% of SL); preanal length short (PAL = 22.2-24.7% of SL); head relatively short (HL = 19.1-21.8% of SL), its length much shorter than its width (HW/HL = 1.06-1.20); postorbital length moderately short (POL = 65.8-70.2% of HL); the upper head lobe is usually larger than lower head lobe; dorsal-fin origin at vertical through posterior margin of upper eye; predorsal length moderately long (PDL = 21.6-28.0% of HL); snout moderately long (SNL = 16.8-21.2% of HL; SNL/ED = 1.55-2.00), round to obliquely blunt anteriorly; anterior margin of upper eye usually equal to, or slightly in advance of, anterior margin of lower eye; fleshy ridge well developed on posterior part of ocular-side lower jaw; membrane covering both eyes; a membranous flap continuous between ocular-side anterior nostril and lower part of eye. Colouration: ocular-side pigmentation uniformly yellow to light-brown, usually with 5-7 complete or incomplete crossbands while blind-side pigmentation uniformly white, usually with pepper-dots and relatively few dermal melanophores at bases of dorsal and anal fins; distinct dermal spots on bases of the anteriormost dorsal- and anal-fin rays on both sides; peritoneum bluish-black (Ref. 126065).
Cross section: flattened.
Occurs on continental shelf with captures from muddy substrata or a mixture of mud and sand (Ref. 126065).
Life cycle and mating behavior
Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve
Lee, M.-Y. and T.A. Munroe, 2021. Unraveling cryptic diversity among shallow-water tonguefishes (Pleuronectiformes: Cynoglossidae: Symphurus) from the Indo-West Pacific region, with descriptions of five new species. Zootaxa 5039(1):1-5.5 (Ref. 126065)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Strumenti
Special reports
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Estimates based on models
Phylogenetic diversity index (Fonte Biblio.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00190 - 0.00797), b=3.17 (3.00 - 3.34), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Trophic level (Fonte Biblio.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Resilienza (Fonte Biblio.
120179): Alto, tempo minimo di raddoppiamento della popolazione meno di 15 mesi (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
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