Classification / Names
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Gymnotiformes (Knifefishes) >
Gymnotidae (Naked-back knifefishes) > Gymnotinae
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335); pantanal: The specific epithet pantanal from the Pantanal Matogrossense of Brazil, the hydrological region of the type locality. A noun in apposition.
Environment: milieu / climate zone / rango de profundidad / distribution range
Ecología
; agua dulce demersal. Tropical
South America: Brazil, Paraguay and Bolivia.
Tamaño / Peso / Age
Madurez: Lm ? range ? - ? cm
Max length : 26.0 cm TL macho / no sexado; (Ref. 118108)
Short description
Claves de identificación | Morfología | Morfometría
Gymnotus pantanal differs from other members of the G. pantherinus species-
group (except G. anguillaris) in possessing a color pattern composed of thin obliquely oriented pale pigment bands (about one third the width of the dark bands) with wavy margins restricted to the ventral portion of the body (rarely extending above the lateral line) on
the anterior half of the body. Gymnotus pantanal further differs from other members of the G. pantherinus species-group in possessing a wider head (72–77 vs. 52–69% head length). Gymnotus pantanal further differs from G. anguillaris in possessing more narrowly set eyes (37–41 vs. 43–56% head length), a deeper head (66–74 vs. 60–65% head length), larger branchial openings (38–43 vs. 29–36% head length), longer pectoral fins (51–56 vs.
42–50% head length), more pectoral-fin rays (mode 17 vs. 16), and fewer pored posterior
lateral-line scales (to first ventral ramus: 47–58 vs. 58–62; total: 102–114 vs. 124–130).
Body shape (shape guide): elongated.
Facultative air-breathing in the genus (Ref. 126274); Found in rooted grasses and floating macrophytes in small creeks and along the banks of larger backwater rivers (Ref. 54472). Occurs syntopically with Gymnotus inaequilabiatus and G. sylvius (Ref. 54472).
Life cycle and mating behavior
Madurez | Reproducción | Puesta | Huevos | Fecundidad | Larva
Fernandes, F.M.C., J.S. Albert, M.F.Z. Daniel-Silva, C.E. Lopes, W.G.R. Crampton and L.F. Almeida-Toledo, 2005. A new Gymnotus (Teleostei: Gymnotiformes: Gymnotidae) from the Pantanal Matogrossense of Brazil and adjacent drainages: continued documention of a cryptic fauna. Zootaxa 933:1-14. (Ref. 54472)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Herramientas
Special reports
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Fuentes de Internet
Estimates based on models
Phylogenetic diversity index (Referencia
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00427 (0.00204 - 0.00890), b=2.99 (2.80 - 3.18), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Nivel trófico (Referencia
69278): 3.3 ±0.4 se; based on size and trophs of closest relatives
Resiliencia (Referencia
120179): Alto, población duplicada en un tiempo mínimo inferior a 15 meses (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (16 of 100).
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