FAMILY Apteronotidae Jordan, 1923 - ghost knifefishes [=?Ophichthytes, Sternarchidae, Adontosternarchinae, Sternarchorhynchinae, Oedemognathinae, Sternarchorhamphini, Sternarchellini, Porotergini] GENUS Adontosternarchus Ellis, in Eigenmann, 1912 - ghost knifefishes Species Adontosternarchus balaenops (Cope, 1878) - Pebas ghost knifefish Species Adontosternarchus clarkae Mago-Leccia et al., 1985 - Raudal ghost knifefish Species Adontosternarchus devenanzii Mago-Leccia et al., 1985 - Cano Cuajarito dwarf knifefish Species Adontosternarchus duartei de Santana & Vari, 2012 - Beruri ghost knifefish Species Adontosternarchus nebulosus Lundberg & Cox Fernandes, 2007 - nebulosus ghost knifefish Species Adontosternarchus sachsi (Peters, 1877) - Sachs' ghost knifefish GENUS Apteronotus Lacépède, 1800 - ghost knifefishes, black ghost knifefishes [=Memarchus, Sternarchus, Ubidia] Species Apteronotus acidops Triques, 2011 - long-snouted electric fish Species Apteronotus albifrons (Linnaeus, 1758) - apteronotid eel [=lacepedii, maximilliani, passan] Species Apteronotus anu de Santana & Vari, 2013 - black ghost knifefish Species Apteronotus apurensis Fernández-Yépez, 1968 - Apure ghost knifefish Species Apteronotus baniwa de Santana & Vari, 2013 - Baniwa ghost knifefish Species Apteronotus bonapartii (Castelnau, 1855) - Bonapart's ghost knifefish [=anas] Species Apteronotus brasiliensis (Reinhardt, 1852) - Velhas ghost knifefish Species Apteronotus camposdapazi de Santana & Lehmann A., 2006 - Rosariana black electric ghost knifefish Species Apteronotus caudimaculosus de Santana, 2003 - Novo black ghost knifefish Species Apteronotus cuchillejo (Schultz, 1949) - Motatan black ghost knifefish Species Apteronotus cuchillo Schultz, 1949 - cuchillo black ghost knifefish Species Apteronotus ellisi (Alonso de Arámburu, 1957) - Parana black ghost knifefish Species Apteronotus eschmeyeri de Santana et al., 2004 - Eschmeyer's black ghost knifefish Species Apteronotus ferrarisi de Santana & Vari, 2013 - Yaracuy black ghost knifefish Species Apteronotus galvisi de Santana et al., 2007 - Cusiana ghost knifefish Species Apteronotus jurubidae (Fowler, 1944) - Jurubida ghost knifefish Species Apteronotus leptorhynchus (Ellis, 1912) - brown ghost knifefish Species Apteronotus lindalvae de Santana & Cox Fernandes, 2012 - Uatuma ghost knifefish Species Apteronotus macrolepis (Steindachner, 1881) - macrolepis ghost knifefish Species Apteronotus macrostomus (Fowler, 1943) - macrostomus ghost knifefish Species Apteronotus magdalenensis (Miles, 1945) - Magdalena ghost knifefish Species Apteronotus magoi de Santana et al., 2006 - Mago ghost knifefish Species Apteronotus mariae (Eigenmann & Fisher, 1914) - Girardot ghost knifefish Species Apteronotus milesi de Santana & Maldonado-Ocampo, 2005 - Amparo ghost knifefish Species Apteronotus paranaensis (Schindler, 1940) - Parana ghost knifefish Species Apteronotus pemon de Santana & Vari, 2013 - Bolivara ghost knifefish Species Apteronotus rostratus (Meek & Hildebrand, 1913) - rostrate ghost knifefish Species Apteronotus spurrellii (Regan, 1914) - Spurrell's ghost knifefish GENUS Compsaraia Albert, 2001 - ghost knifefishes Species Compsaraia compsa (Mago-Leccia, 1994) - compsa ghost knifefish Species Compsaraia iara Bernt & Albert, 2017 - iara ghost knifefish Species Compsaraia samueli Albert & Crampton, 2009 - Samuel's ghost knifefish GENUS Megadontognathus Mago-Leccia, 1994 - ghost knifefishes Species Megadontognathus cuyuniense Mago-Leccia, 1994 - Cuyuni ghost knifefish Species Megadontognathus kaitukaensis Campos-da-paz, 1999 - Kaituka ghost knifefish GENUS Orthosternarchus Ellis, 1913 - tamandua knifefishes Species Orthosternarchus tamandua (Boulenger, 1898) - tamandua knifefish GENUS Parapteronotus Albert, 2001 - dragon knifefishes Species Parapteronotus hasemani (Ellis, 1913) - dragon knifefish, dolphin knifefish [=anas] GENUS Pariosternarchus Albert & Crampton, 2006 - Amazon knifefishes Species Pariosternarchus amazonensis Albert & Crampton, 2006 - Amazon knifefish GENUS Platyurosternarchus Mago-Leccia, 1994 - ghost knifefishes Species Platyurosternarchus crypticus de Santana & Vari, 2009 - Moco-Moco ghost knifefish Species Platyurosternarchus macrostoma (Günther, 1870) - whitewater ghost knifefish GENUS Porotergus Ellis, in Eigenmann, 1912 - ghost knifefishes Species Porotergus duende de Santana & Crampton, 2010 - Solimoes ghost knifefish Species Porotergus gimbeli Ellis, 1912 - Para ghost knifefish Species Porotergus gymnotus Ellis, 1912 - gymnotus ghost knifefish GENUS Sternarchella Eigenmann, in Eigenmann & Ward, 1905 - ghost knifefishes [=Magosternarchus] Species Sternarchella calhamazon Lundberg et al., 2013 - Maderia ghost knifefish Species Sternarchella duccis (Lundberg et al., in Lundberg et al., 1996) - Branco ghost knifefish Species Sternarchella orinoco Mago-Leccia, 1994 - Orinoco ghost knifefish Species Sternarchella orthos Mago-Leccia, 1994 - orthos ghost knifefish Species Sternarchella patriciae Evans et al., 2017 - Maldonado ghost knifefish Species Sternarchella raptor (Lundberg et al., in Lundberg et al., 1996) - Solimoes ghost knifefish Species Sternarchella rex Evans et al., 2017 - Mamiraua ghost knifefish Species Sternarchella schotti (Steindachner, 1868) - Schott's ghost knifefish [=capanemae, terminalis] Species Sternarchella sima Starks, 1913 - sima ghost knifefish GENUS Sternarchogiton Eigenmann, in Eigenmann & Ward, 1905 - ghost knifefishes [=Oedemognathus] Species Sternarchogiton labiatus de Santana & Crampton, 2007 - tri-lobe lipped ghost knifefish Species Sternarchogiton nattereri (Steindachner, 1868) - sponge-eating ghost knifefish [=exodon] Species Sternarchogiton porcinum Eigenmann & Allen, 1942 - porcinum ghost knifefish Species Sternarchogiton preto de Santana & Crampton, 2007 - Tefe ghost knifefish Species Sternarchogiton zuanoni de Santana & Vari, 2010 - Zuanon ghost knifefish GENUS Sternarchorhamphus Eigenmann, in Eigenmann & Ward, 1905 - ghost knifefishes Species Sternarchorhamphus muelleri (Steindachner, 1881) - Mueller's ghost knifefish GENUS Sternarchorhynchus Castelnau, 1855 - ghost knifefishes, tube-snouted ghost knifefishes [=Rhamphosternarchus] Species Sternarchorhynchus axelrodi de Santana & Vari, 2010 - Axelrod's tube-snouted knifefish Species Sternarchorhynchus britskii Campos-da-Paz, 2000 - Parama ghost knifefish Species Sternarchorhynchus caboclo de Santana & Nogueira, 2006 - Mucajai ghost knifefish Species Sternarchorhynchus chaoi de Santana & Vari, 2010 - Chao ghost knifefish Species Sternarchorhynchus cramptoni de Santana & Vari, 2010 - Crampton's ghost knifefish Species Sternarchorhynchus curumim de Santana & Crampton, 2006 - Toco Preto ghost knifefish Species Sternarchorhynchus curvirostris (Boulenger, 1887) - Bobanaza tube-snouted ghost knifefish Species Sternarchorhynchus freemani de Santana & Vari, 2010 - Essequibo ghost knifefish Species Sternarchorhynchus galibi de Santana & Vari, 2010 - Lawa ghost knifefish Species Sternarchorhynchus gnomus de Santana & Taphorn, 2006 - gnomus ghost knifefish Species Sternarchorhynchus goeldii de Santana & Vari, 2010 - Goeldi's tube-snouted ghost knifefish Species Sternarchorhynchus hagedornae de Santana & Vari, 2010 - Hagedorn's tube-snouted ghost knifefish Species Sternarchorhynchus higuchii de Santana & Vari, 2010 - Higuchi's tube-snouted ghost knifefish Species Sternarchorhynchus inpai de Santana & Vari, 2010 - Inpa tube-snouted ghost knifefish Species Sternarchorhynchus jaimei de Santana & Vari, 2010 - Jaime's tube-snouted ghost knifefish Species Sternarchorhynchus kokraimoro de Santana & Vari, 2010 - Kokraimoro tube-snouted knifefish Species Sternarchorhynchus mareikeae de Santana & Vari, 2010 - Mareike's tube-snouted knifefish Species Sternarchorhynchus marreroi de Santana & Vari, 2010 - Marrero's tube-snouted knifefish Species Sternarchorhynchus mendesi de Santana & Vari, 2010 - Mendes' tube-snouted knifefish Species Sternarchorhynchus mesensis Campos-da-Paz, 2000 - Mesa tube-snouted knifefish Species Sternarchorhynchus montanus de Santana & Vari, 2010 - montanus tube-snouted knifefish Species Sternarchorhynchus mormyrus (Steindachner, 1868) - mormyrus tube-snouted knifefish Species Sternarchorhynchus oxyrhynchus (Müller & Troschel, 1849) - elephant-nose knifefish [=mulleri] Species Sternarchorhynchus retzeri de Santana & Vari, 2010 - Retzer's tube-snouted ghost knifefish Species Sternarchorhynchus roseni Mago-Leccia, 1994 - Rosen's tube-snouted ghost knifefish Species Sternarchorhynchus schwassmanni de Santana & Vari, 2010 - Schwassmann's tube-snouted ghost knifefish Species Sternarchorhynchus severii de Santana & Nogueira, 2006 - Severi's tube-snouted ghost knifefish Species Sternarchorhynchus starksi de Santana & Vari, 2010 - Starks' tube-snouted ghost knifefish Species Sternarchorhynchus stewarti de Santana & Vari, 2010 - Stewart's tube-snouted ghost knifefish Species Sternarchorhynchus taphorni de Santana & Vari, 2010 - Taphorn's tube-snouted ghost knifefish Species Sternarchorhynchus villasboasi de Santana & Vari, 2010 - Villasboas' tube-snouted knifefish Species Sternarchorhynchus yepezi de Santana & Vari, 2010 - Yepez' tube-snouted ghost knifefish GENUS Tembeassu Triques, 1998 - weakly electric knifefishes Species Tembeassu marauna Triques, 1998 - Parana weakly electric knifefish .