Gymnotus
Gymnotus, tropicus familiae Gymnotidarum piscis, est unus ex multiplicissimis gymnotiformibus in Amazonia gregibus inventis. Aliquae species intra folia reliqua radicesque implicatas prope ripas fluminum, aliquae in planitiebus inundatis intra circumplicatas pratorum innantium radices habitant. Nonnullae species in ambabus habitationibus vivere possunt.

Gymnotus est praedator nocturnus, qui insectis, crustaceis, et aliis piscibus vescitur. Tenues gignunt campos electricos, ad inveniendas res adhibitos, et ad communicandos nuntios, dum mares feminas tritis "carminibus" electricis petunt.

Species
 Gymnotus anguillaris Hoedeman, 1962.
 Gymnotus arapaima Albert & Crampton, 2001.
 Gymnotus ardilai Maldonado-Ocampo & Albert, 2004.
 Gymnotus bahianus Campos-da-Paz & Costa, 1996.
 Gymnotus carapo Linnaeus, 1758.
 Gymnotus cataniapo Mago-Leccia, 1994.
 Gymnotus chimarrao Cognato et al., 2007
 Gymnotus choco Albert, Crampton & Maldonado, 2003.
 Gymnotus coatesi La Monte, 1935.
 Gymnotus coropinae Hoedeman, 1962.
 Gymnotus curupira Crampton, Thorsen & Albert, 2005.
 Gymnotus cylindricus La Monte, 1935.
 Gymnotus diamantinensis Campos-da-Paz, 2002.
 Gymnotus esmeraldas Albert & Crampton, 2003.
 Gymnotus henni Albert, Crampton & Maldonado, 2003.
 Gymnotus inaequilabiatus (Valenciennes, 1842).
 Gymnotus javari Albert, Crampton & Hagedorn, 2003.
 Gymnotus jonasi Albert & Crampton, 2001.
 Gymnotus maculosus Albert & Miller, 1995.
 Gymnotus mamiraua Albert & Crampton, 2001.
 Gymnotus melanopleura Albert & Crampton, 2001.
 Gymnotus obscurus Crampton, Thorsen & Albert, 2005.
 Gymnotus onca Albert & Crampton, 2001.
 Gymnotus panamensis Albert & Crampton, 2003.
 Gymnotus pantanal Fernandes, Albert, Daniel-Silva, Lopes, Crampton & Almeida-Toledo, 2005.
 Gymnotus pantherinus (Steindachner, 1908).
 Gymnotus paraguensis Albert & Crampton, 2003.
 Gymnotus pedanopterus Mago-Leccia, 1994.
 Gymnotus stenoleucus Mago-Leccia, 1994.
 Gymnotus sylvius Albert & Fernandes-Matioli, 1999.
 Gymnotus tigre Albert & Crampton, 2003.
 Gymnotus ucamara Crampton, Lovejoy & Albert, 2003.
 Gymnotus varzea Crampton, Thorsen & Albert, 2005.

Gymnotidae
Taxa Linnaei
Taxa 1758