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Gymnotus varzea  Crampton, Thorsen & Albert, 2005

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Gymnotus varzea
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Classification / Names Nomi Comuni | Sinonimi | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterigi (pesci con pinne raggiate) > Gymnotiformes (Knifefishes) > Gymnotidae (Naked-back knifefishes)
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335);  varzea: Named for the whitewater várzea floodplain, which this species is restricted to.

Ambiente / Clima / Range Ecologia

; acqua dolce benthopelagico.   Tropical, preferred ?

Distribuzione Stati | Aree FAO | Ecosystems | Presenze | Point map | Introduzioni | Faunafri

South America: Amazon basin in Brazil and Peru.

Size / Peso / Age

Maturity: Lm ?  range ? - ? cm
Max length : 28.5 cm TL maschio/sesso non determinato; (Ref. 55508); Peso massimo pubblicato: 65.00 g (Ref. 55508)

Short description Morfologia | Morfometria

Spine dorsali (totale): 0; Raggi dorsali molli (totale): 0; Raggi anali molli: 230 - 310. Distinguished from its congeners endemic to the Amazon and Orinoco Basins and the Guyana Shield in having a color pattern of 16-22 oblique dark pigment bands with wavy and irregular margins in which the majority of bands at midbody form X-shaped patterns (resembling metaphase chromosomes) and in which the dark bands are about twice as broad as the pale interbands. Further differs from its congeners in having the following unique combination of characters: clear (unpigmented) patch at the caudal end of the anal-fin membrane in specimens 6.0-23.7 cm; and bands never divided to form band pairs (Ref. 55508).

Biologia     Glossario (es. epibenthic)

Found in root mats of floating meadows in floodplains (Ref. 55508). Gulps atmospheric air into the hypervascularized posterior chamber of its gas bladder (Ref. 55508). Feeds on small aquatic invertebrates such as chironomid larvae, insect nymphs and microcrustaceans (Ref. 55508).

Life cycle and mating behavior Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve

Main reference Upload your references | Bibliografia | Coordinatore : Campos-da-Paz, Ricardo | Collaboratori

Crampton, W.G.R., D.H. Thorsen and J.S. Albert, 2005. Three new species from a diverse, sympatric assemblage of the electric fish Gymnotus (Gymnotiformes: Gymnotidae) in the lowland Amazon basin, with notes on ecology. Copeia 2005(1):82-99. (Ref. 55508)

IUCN Red List Status (Ref. 115185)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




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