| Scientific Name | Author | English Name |
|---|---|---|
| Electrophorus electricus | (Linnaeus, 1766) | Electric eel |
| Gymnotus anguillaris | Hoedeman, 1962 | |
| Gymnotus arapaima | Albert & Crampton, 2001 | |
| Gymnotus ardilai | Maldonado-Ocampo & Albert, 2004 | |
| Gymnotus bahianus | Campos-da-Paz & Costa, 1996 | |
| Gymnotus capanema | Milhomem, Crampton, Pierczeka, Shetka, Silva & Nagamachi, 2012 | |
| Gymnotus capitimaculatus | Rangel-Pereira, 2014 | |
| Gymnotus carapo | Linnaeus, 1758 | Banded knifefish |
| Gymnotus cataniapo | Mago-Leccia, 1994 | |
| Gymnotus chaviro | Maxime & Albert, 2009 | |
| Gymnotus chimarrao | Cognato, Richer-de-Forges, Albert & Crampton, 2008 | |
| Gymnotus choco | Albert, Crampton & Maldonado-Ocampo, 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-Ocampo, 2003 | |
| Gymnotus inaequilabiatus | (Valenciennes, 1839) | |
| Gymnotus interruptus | Rangel-Pereira, 2012 | |
| Gymnotus javari | Albert, Crampton & Hagedorn, 2003 | |
| Gymnotus jonasi | Albert & Crampton, 2001 | |
| Gymnotus maculosus | Albert & Miller, 1995 | Spotted knifefish |
| Gymnotus mamiraua | Albert & Crampton, 2001 | |
| Gymnotus melanopleura | Albert & Crampton, 2001 | |
| Gymnotus obscurus | Crampton, Thorsen & Albert, 2005 | |
| Gymnotus omarorum | Richer-de-Forges, Crampton & Albert, 2009 | |
| 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 tiquie | Maxime, Lima & Albert, 2011 | |
| Gymnotus ucamara | Crampton, Lovejoy & Albert, 2003 | |
| Gymnotus varzea | Crampton, Thorsen & Albert, 2005 |