| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Gymnotus anguillaris Hoedeman, 1962 |
South America | 30 | |
| Gymnotus arapaima Albert & Crampton, 2001 |
South America | 55 | |
| Gymnotus ardilai Maldonado-Ocampo & Albert, 2004 |
South America | ||
| Gymnotus bahianus Campos-da-Paz & Costa, 1996 |
South America | 27.6 | |
| Gymnotus capanema Milhomem, Crampton, Pierczeka, Shetka, Silva & Nagamachi, 2012 |
South America | 17.9 | |
| Gymnotus capitimaculatus Rangel-Pereira, 2014 |
South America | 15.84 | |
| Gymnotus carapo Linnaeus, 1758 |
Banded knifefish | Central and South America | 76 |
| Gymnotus cataniapo Mago-Leccia, 1994 |
South America | 31.6 | |
| Gymnotus chaviro Maxime & Albert, 2009 |
South America | 27.5 | |
| Gymnotus chimarrao Cognato, Richer-de-Forges, Albert & Crampton, 2008 |
South America | 24.3 | |
| Gymnotus choco Albert, Crampton & Maldonado-Ocampo, 2003 |
South America | 26 | |
| Gymnotus coatesi La Monte, 1935 |
South America | 30 | |
| Gymnotus coropinae Hoedeman, 1962 |
South America | 34.5 | |
| Gymnotus cuia Craig, Malabarba, Crampton & Albert, 2018 |
South America | 30.5 | |
| Gymnotus curupira Crampton, Thorsen & Albert, 2005 |
South America | 23.5 | |
| Gymnotus cylindricus La Monte, 1935 |
Central America | ||
| Gymnotus darwini Campos-da-Paz & de Santana, 2019 |
South America | 15.7 | |
| Gymnotus diamantinensis Campos-da-Paz, 2002 |
South America | 12.5 | |
| Gymnotus esmeraldas Albert & Crampton, 2003 |
South America | 30.9 | |
| Gymnotus henni Albert, Crampton & Maldonado-Ocampo, 2003 |
South America | 31.2 | |
| Gymnotus inaequilabiatus (Valenciennes, 1839) |
South America | 99.8 | |
| Gymnotus interruptus Rangel-Pereira, 2012 |
South America | 12.11 | |
| Gymnotus javari Albert, Crampton & Hagedorn, 2003 |
South America | 20.1 | |
| Gymnotus jonasi Albert & Crampton, 2001 |
South America | 13.5 | |
| Gymnotus maculosus Albert & Miller, 1995 |
Spotted knifefish | Central America | |
| Gymnotus mamiraua Albert & Crampton, 2001 |
South America | 24.3 | |
| Gymnotus melanopleura Albert & Crampton, 2001 |
South America | 10 | |
| Gymnotus obscurus Crampton, Thorsen & Albert, 2005 |
South America | 21.5 | |
| Gymnotus omarorum Richer-de-Forges, Crampton & Albert, 2009 |
South America | 28.6 | |
| Gymnotus onca Albert & Crampton, 2001 |
South America | 12 | |
| Gymnotus panamensis Albert & Crampton, 2003 |
Central America | 23.6 | |
| Gymnotus pantanal Fernandes, Albert, Daniel-Silva, Lopes, Crampton & Almeida-Toledo, 2005 |
South America | 26 | |
| Gymnotus pantherinus (Steindachner, 1908) |
South America | 23.58 | |
| Gymnotus paraguensis Albert & Crampton, 2003 |
South America | 24 | |
| Gymnotus pedanopterus Mago-Leccia, 1994 |
South America | 28.1 | |
| Gymnotus refugio Giora & Malabarba, 2016 |
South America | ||
| Gymnotus stenoleucus Mago-Leccia, 1994 |
South America | 14.2 | |
| Gymnotus sylvius Albert & Fernandes-Matioli, 1999 |
South America | 42 | |
| Gymnotus tigre Albert & Crampton, 2003 |
South America | 41.1 | |
| Gymnotus tiquie Maxime, Lima & Albert, 2011 |
Tiquie banded knifefish | South America | 24 |
| Gymnotus ucamara Crampton, Lovejoy & Albert, 2003 |
South America | 19 | |
| Gymnotus varzea Crampton, Thorsen & Albert, 2005 |
South America | 28.5 |