• Adontosternarchus balaenops (Cope, 1878)
• Adontosternarchus clarkae Mago-Leccia, Lundberg & Baskin, 1985
• Adontosternarchus devenanzii Mago-Leccia, Lundberg & Baskin, 1985
• Adontosternarchus sachsi (Peters, 1877)
• Apteronotus albifrons (Linnaeus, 1766)
• Apteronotus anas Eigenmann & Allen, 1942 accepted as Parapteronotus hasemani (Ellis, 1913)
• Apteronotus apurensis Fernández-Yépez, 1968
• Apteronotus bonapartii (Castelnau, 1855)
• Apteronotus brasiliensis (Reinhardt, 1852)
• Apteronotus camposdapazi
• Apteronotus caudimaculosus Santana, 2003
• Apteronotus cuchillejo (Schultz, 1949)
• Apteronotus cuchillo Schultz, 1949
• Apteronotus ellisi (Alonso de Arámburu, 1957)
• Apteronotus eschmeyeri Santana, Maldonado-Ocampo, Severi & Mendes, 2004
• Apteronotus hasemani (Ellis, 1913) accepted as Parapteronotus hasemani (Ellis, 1913)
• Apteronotus jurubidae (Fowler, 1944)
• Apteronotus leptorhynchus (Ellis, 1912)
• Apteronotus macrolepis (Steindachner, 1881)
• Apteronotus macrostomus (Fowler, 1943)
• Apteronotus magdalenensis (Miles, 1945)
• Apteronotus magoi
• Apteronotus marauna (Triques, 1998)
• Apteronotus mariae (Eigenmann & Fisher, 1914)
• Apteronotus milesi
• Apteronotus passan Lacepède, 1800 accepted as Apteronotus albifrons (Linnaeus, 1766)
• Apteronotus rostratus (Meek & Hildebrand, 1913)
• Apteronotus spurrellii (Regan, 1914)
• Archeolaemus blax Korringa, 1970 accepted as Archolaemus blax Korringa, 1970
• Archolaemus blax Korringa, 1970
• Brachyhypopomus beebei (Schultz, 1944)
• Brachyhypopomus brevirostris (Steindachner, 1868)
• Brachyhypopomus diazi (Fernández-Yépez, 1972)
• Brachyhypopomus elegans (Steindachner, 1880) accepted as Steatogenys elegans (Steindachner, 1880)
• Brachyhypopomus janeiroensis (Costa & Campos-da-Paz, 1992)
• Brachyhypopomus jureiae Triques & Khamis, 2003
• Brachyhypopomus occidentalis (Regan, 1914)
• Brachyhypopomus pinnicaudatus (Hopkins, 1991)
• Compsaraia compsa (Mago-Leccia, 1994)
• Compsaraia compsus (Mago-Leccia, 1994) accepted as Compsaraia compsa (Mago-Leccia, 1994)
• Distocyclus conirostris (Eigenmann & Allen, 1942)
• Distocyclus goajira (Schultz, 1949)
• Eigenmannia conirostris Eigenmann & Allen, 1942 accepted as Distocyclus conirostris (Eigenmann & Allen, 1942)
• Eigenmannia goajira Schultz, 1949 accepted as Distocyclus goajira (Schultz, 1949)
• Eigenmannia humboldtii (Steindachner, 1878)
• Eigenmannia limbata (Schreiner & Miranda-Ribeiro, 1903)
• Eigenmannia lineata (Müller & Troschel, 1845) accepted as Eigenmannia virescens (Valenciennes, 1842)
• Eigenmannia macrops (Boulenger, 1897)
• Eigenmannia microstoma (Reinhardt, 1852)
• Eigenmannia nigra Mago-Leccia, 1994
• Eigenmannia trilineata López & Castello, 1966
• Eigenmannia vicentespelaea Triques, 1996
• Eigenmannia virescens (Valenciennes, 1842)
• Electrophorus electricus (Linnaeus, 1766)
• Electrophorus multivalvulus Nakashima, 1941 accepted as Electrophorus electricus (Linnaeus, 1766)
• Guichthys caviceps Fernández-Yépez, 1968 accepted as Rhabdolichops caviceps (Fernández-Yépez, 1968)
• Gymnorhamphichthys apurensis Fernández-Yépez, 1968 accepted as Rhamphichthys apurensis (Fernández-Yépez, 1968)
• Gymnorhamphichthys caianus (Triques, 1996) accepted as Iracema caiana Triques, 1996
• Gymnorhamphichthys hypostomus Ellis, 1912
• Gymnorhamphichthys petiti Géry & Vu-Tân-Tuê, 1964
• Gymnorhamphichthys rondoni (Miranda-Ribeiro, 1920)
• Gymnorhamphichthys rosamariae Schwassmann, 1989
• Gymnotus acus Brünnich, 1768 accepted as Carapus acus (Brünnich, 1768)
• Gymnotus aequilabiatus Humboldt, 1805 accepted as Sternopygus aequilabiatus (Humboldt, 1805)
• Gymnotus albifrons Linnaeus, 1766 accepted as Apteronotus albifrons (Linnaeus, 1766)
• Gymnotus albus Pallas, 1769 accepted as Gymnotus carapo Linnaeus, 1758
• Gymnotus albus Zuiew, 1789 accepted as Monopterus albus (Zuiew, 1793)
• Gymnotus anguillaris Hoedeman, 1962
• Gymnotus arapaima Albert & Crampton, 2001
• Gymnotus ardilai Maldonado-Ocampo & Albert, 2004
• Gymnotus asiaticus Linnaeus, 1758 accepted as Channa asiatica (Linnaeus, 1758)
• Gymnotus bahianus Campos-da-Paz & Costa, 1996
• Gymnotus brachiurus Bloch, 1786 accepted as Gymnotus carapo Linnaeus, 1758
• Gymnotus carapo Linnaeus, 1758
• Gymnotus cataniapo Mago-Leccia, 1994
• 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 electricus Linnaeus, 1766 accepted as Electrophorus electricus (Linnaeus, 1766)
• Gymnotus esmeraldas Albert & Crampton, 2003
• Gymnotus fasciatus Pallas, 1769 accepted as Gymnotus carapo Linnaeus, 1758
• Gymnotus henni Albert, Crampton & Maldonado, 2003
• Gymnotus inaequilabiatus (Valenciennes, 1842)
• Gymnotus javari Albert, Crampton & Hagedorn, 2003
• Gymnotus jonasi Albert & Crampton, 2001
• Gymnotus longirostratus Lacepède, 1800 accepted as Rhamphichthys rostratus (Linnaeus, 1766)
• Gymnotus macrurus Bloch & Schneider, 1801 accepted as Sternopygus macrurus (Bloch & Schneider, 1801)
• Gymnotus maculosus Albert & Miller, 1995
• Gymnotus mamiraua Albert & Crampton, 2001
• Gymnotus melanopleura Albert & Crampton, 2001
• Gymnotus notopterus Pallas, 1769 accepted as Notopterus notopterus (Pallas, 1769)
• 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