FAMILY Gymnotidae Rafinesque, 1815 - nakedback knifefishes [=Ginnotini, Gymnotia, Electrophoridae] GENUS Electrophorus Gill, 1864 - electric eels Species Electrophorus electricus (Linnaeus, 1766) - electric eel [=multivalvulus, regius, tremulus] GENUS Gymnotus Linnaeus, 1758 - knifefishes, banded knifefishes [=Carapo, Giton, Gymnonotus] Species Gymnotus anguillaris Hoedeman, 1962 - Macanan zebra knifefish Species Gymnotus arapaima Albert & Crampton, 2001 - arapaima knifefish Species Gymnotus ardilai Maldonado-Ocampo & Albert, 2004 - De Oro River knifefish Species Gymnotus bahianus Campos-da-Paz & Costa, 1996 - Rio Almada knifefish Species Gymnotus capanema Milhomem et al., 2012 - Crampton's knifefish Species Gymnotus carapo Linnaeus, 1758 - banded knifefish [=albus, australis, brachiurus, caatingaensis, carapus G, fasciatus, madeirensis, occidentalis, orientalis, putaol, septentrionalis] Species Gymnotus capitimaculatus Rangel-Pereira, 2014 - Rio do Ouro knifefish Species Gymnotus cataniapo Mago-Leccia, 1994 - cataniapo knifefish Species Gymnotus chaviro Maxime & Albert, 2009 - chaviro knifefish Species Gymnotus chimarrao Cognato et al., 2008 - Arroio Grande knifefish Species Gymnotus choco Albert et al., in Albert & Crampton, 2003 - Rio Baudo knifefish Species Gymnotus coatesi La Monte, 1935 - Rio Moju knifefish [=cingulatus] Species Gymnotus coropinae Hoedeman, 1962 - Coropina knifefish Species Gymnotus curupira Crampton et al., 2005 - Curupira knifefish Species Gymnotus cylindricus La Monte, 1935 - cylindrical knifefish Species Gymnotus diamantinensis Campos-da-Paz, 2002 - Tapajos knifefish Species Gymnotus esmeraldas Albert & Crampton, 2003 - Rio Esmeraldas knifefish Species Gymnotus henni Albert et al., 2003 - Henn's knifefish Species Gymnotus inaequilabiatus (Valenciennes, 1839) - La Plata knifefish Species Gymnotus interruptus Rangel-Pereira, 2012 - Cambiriba knifefish Species Gymnotus javari Albert et al., 2003 - Javari knifefish Species Gymnotus jonasi Albert & Crampton, 2001 - Jonas' knifefish Species Gymnotus maculosus Albert & Miller, 1995 - spotted knifefish Species Gymnotus mamiraua Albert & Crampton, 2001 - Mamiraua knifefish Species Gymnotus melanopleura Albert & Crampton, 2001 - melanopleura knifefish Species Gymnotus obscurus Crampton et al., 2005 - obscure knifefish Species Gymnotus omarorum Richer-de-Forges et al., 2009 - Omars' banded knifefish Species Gymnotus onca Albert & Crampton, 2001 - onca knifefish Species Gymnotus panamensis Albert & Crampton, 2003 - Panama knifefish Species Gymnotus pantanal Fernandes et al., 2005 - pantanal knifefish Species Gymnotus pantherinus (Steindachner, 1908) - Santos knifefish Species Gymnotus paraguensis Albert & Crampton, 2003 - Paraguay knifefish Species Gymnotus pedanopterus Mago-Leccia, 1994 - Tremblador knifefish Species Gymnotus refugio Giora & Malabarba, 2016 - Ferraria knifefish Species Gymnotus stenoleucus Mago-Leccia, 1994 - Caripo knifefish Species Gymnotus sylvius Albert & Fernandes-Matioli, in Albert et al., 1999 - Riberia de Iguape knifefish Species Gymnotus tigre Albert & Crampton, 2003 - tigre knifefish Species Gymnotus tiquie Maxime et al., 2011 - Tiquie knifefish Species Gymnotus ucamara Crampton et al., 2003 - Ucayali knifefish Species Gymnotus varzea Crampton et al., 2005 - Tefe knifefish .