| Genus/Species | Common Name | Image |
|---|---|---|
| Adontosternarchus balaenops | Unspecified | |
| Adontosternarchus clarkae | Unspecified | |
| Adontosternarchus devenanzii | Unspecified | |
| Adontosternarchus duartei | Unspecified | |
| Adontosternarchus nebulosus | Unspecified | |
| Adontosternarchus sachsi | Unspecified | |
| Apteronotus acidops | Unspecified | |
| Apteronotus albifrons | Black ghost knife-fish | |
| Apteronotus apurensis | Unspecified | |
| Apteronotus bonapartii | Unspecified | |
| Apteronotus brasiliensis | Unspecified | |
| Apteronotus camposdapazi | Unspecified | |
| Apteronotus caudimaculosus | Unspecified | |
| Apteronotus cuchillejo | Unspecified | |
| Apteronotus cuchillo | Unspecified | |
| Apteronotus ellisi | Unspecified | |
| Apteronotus eschmeyeri | Unspecified | |
| Apteronotus galvisi | Unspecified | |
| Apteronotus jurubidae | Unspecified | |
| Apteronotus leptorhynchus | Brown ghost knife-fish | |
| Apteronotus lindalvae | Unspecified | |
| Apteronotus macrolepis | Unspecified | |
| Apteronotus macrostomus | Unspecified | |
| Apteronotus magdalenensis | Unspecified | |
| Apteronotus magoi | Unspecified | |
| Apteronotus mariae | Unspecified | |
| Apteronotus milesi | Unspecified | |
| Apteronotus rostratus | Unspecified | |
| Apteronotus spurrellii | Unspecified | |
| Compsaraia compsus | Unspecified | |
| Compsaraia iara | Unspecified | |
| Compsaraia samueli | Unspecified | |
| Magosternarchus duccis | Unspecified | |
| Magosternarchus raptor | Unspecified | |
| Megadontognathus cuyuniense | Unspecified | |
| Megadontognathus kaitukaensis | Unspecified | |
| Orthosternarchus tamandua | Unspecified | |
| Parapteronotus hasemani | Unspecified | |
| Pariosternarchus amazonensis | Unspecified | |
| Platyurosternarchus crypticus | Unspecified | |
| Platyurosternarchus macrostomus | Unspecified | |
| Porotergus duende | Unspecified | |
| Porotergus gimbeli | Unspecified | |
| Porotergus gymnotus | Unspecified | |
| Sternarchella calhamazon | Unspecified | |
| Sternarchella curvioperculata | Unspecified | |
| Sternarchella orthos | Unspecified | |
| Sternarchella schotti | Unspecified | |
| Sternarchella sima | Unspecified | |
| Sternarchella terminalis | Unspecified | |
| Sternarchogiton labiatus | Unspecified | |
| Sternarchogiton nattereri | Unspecified | |
| Sternarchogiton porcinum | Unspecified | |
| Sternarchogiton preto | Unspecified | |
| Sternarchogiton zuanoni | Unspecified | |
| Sternarchorhamphus muelleri | Unspecified | |
| Sternarchorhynchus axelrodi | Axelrod's tube-snouted ghost knife-fish | |
| Sternarchorhynchus britskii | Britski's tube-snouted ghost knife-fish | |
| Sternarchorhynchus caboclo | Cabocolo tube-snouted ghost knife-fish | |
| Sternarchorhynchus chaoi | Chao's tube-snouted ghost knife-fish | |
| Sternarchorhynchus cramptoni | Crampton's tube-snouted ghost knife-fish | |
| Sternarchorhynchus curumim | Curumim tube-snouted ghost knife-fish | |
| Sternarchorhynchus curvirostris | Unspecified | |
| Sternarchorhynchus freemani | Freeman's tube-snouted ghost knife-fish | |
| Sternarchorhynchus galibi | Galibi tube-snouted ghost knife-fish | |
| Sternarchorhynchus gnomus | Gnomus tube-snouted ghost knife-fish | |
| Sternarchorhynchus goeldii | Goeldi's tube-snouted ghost knife-fish | |
| Sternarchorhynchus hagedornae | Hagedorn's tube-snouted ghost knife-fish | |
| Sternarchorhynchus higuchii | Higuchi's tube-snouted ghost knife-fish | |
| Sternarchorhynchus inpai | Inpa tube-snouted ghost knife-fish | |
| Sternarchorhynchus jaimei | Jamei's tube-snouted ghost knife-fish | |
| Sternarchorhynchus kokraimoro | Kokraimoro tube-snouted ghost knife-fish | |
| Sternarchorhynchus mareikeae | Mareike's tube-snouted ghost knife-fish | |
| Sternarchorhynchus marreroi | Marrero's tube-snouted ghost knife-fish | |
| Sternarchorhynchus mendesi | Mendes' tube-snouted ghost knife-fish | |
| Sternarchorhynchus mesensis | Mesensis tube-snouted ghost knife-fish | |
| Sternarchorhynchus montanus | Montanus tube-snouted ghost knife-fish | |
| Sternarchorhynchus mormyrus | Mormyrus tube-snouted ghost knife-fish | |
| Sternarchorhynchus oxyrhynchus | Oxyrhynchus tube-snouted ghost knife-fish | |
| Sternarchorhynchus retzeri | Retzer's tube-snouted ghost knife-fish | |
| Sternarchorhynchus roseni | Rosen's tube-snouted ghost knife-fish | |
| Sternarchorhynchus schwassmanni | Unspecified | |
| Sternarchorhynchus severii | Severi's tube-snouted ghost knife-fish | |
| Sternarchorhynchus starksi | Stark's tube-snouted ghost knife-fish | |
| Sternarchorhynchus stewarti | Stewart's tube-snouted ghost knife-fish | |
| Sternarchorhynchus taphorni | Taphorn's tube-snouted ghost knife-fish | |
| Sternarchorhynchus villasboasi | Villasboas' tube-snouted ghost knife-fish | |
| Sternarchorhynchus yepezi | Yepez' tube-snouted ghost knife-fish | |
| Tembeassu marauna | Unspecified |
| Genus/Species | Common Name | Image |
|---|---|---|
| Electrophorus electricus | Electric eel | |
| Gymnotus anguillaris | Unspecified | |
| Gymnotus arapaima | Unspecified | |
| Gymnotus ardilai | Unspecified | |
| Gymnotus bahianus | Unspecified | |
| Gymnotus capanema | Unspecified | |
| Gymnotus capitimaculatus | Unspecified | |
| Gymnotus carapo | Banded knife-fish | |
| Gymnotus cataniapo | Unspecified | |
| Gymnotus chaviro | Unspecified | |
| Gymnotus chimarrao | Unspecified |  |
| Gymnotus choco | Unspecified |  |
| Gymnotus coatesi | Unspecified |  |
| Gymnotus coropinae | Unspecified | |
| Gymnotus curupira | Unspecified | |
| Gymnotus cylindricus | Unspecified | |
| Gymnotus diamantinensis | Unspecified | |
| Gymnotus esmeraldas | Unspecified | |
| Gymnotus henni | Unspecified |  |
| Gymnotus inaequilabiatus | Unspecified | |
| Gymnotus interruptus | Unspecified |  |
| Gymnotus javari | Unspecified | |
| Gymnotus jonasi | Unspecified | |
| Gymnotus maculosus | Spotted knife-fish | |
| Gymnotus mamiraua | Unspecified |  |
| Gymnotus melanopleura | Unspecified | |
| Gymnotus obscurus | Unspecified | |
| Gymnotus omarorum | Unspecified | |
| Gymnotus onca | Unspecified | |
| Gymnotus panamensis | Unspecified | |
| Gymnotus pantanal | Unspecified | |
| Gymnotus pantherinus | Unspecified | |
| Gymnotus paraguensis | Unspecified | |
| Gymnotus pedanopterus | Zebra knife-fish | |
| Gymnotus stenoleucus | Unspecified |  |
| Gymnotus sylvius | Unspecified | |
| Gymnotus tigre | Tiger knife-fish | |
| Gymnotus tiquie | Unspecified |  |
| Gymnotus ucamara | Unspecified | |
| Gymnotus varzea | Unspecified |
| Genus/Species | Common Name | Image |
|---|---|---|
| Akawaio penak | Unspecified | |
| Brachyhypopomus alberti | Unspecified |  |
| Brachyhypopomus arrayae | Unspecified | |
| Brachyhypopomus batesi | Unspecified |  |
| Brachyhypopomus beebei | Unspecified | |
| Brachyhypopomus belindae | Unspecified |  |
| Brachyhypopomus benjamini | Unspecified | |
| Brachyhypopomus bennetti | Unspecified | |
| Brachyhypopomus bombilla | Unspecified | |
| Brachyhypopomus brevirostris | Blunt-nose knifefish | |
| Brachyhypopomus bullocki | Unspecified | |
| Brachyhypopomus cunia | Unspecified | |
| Brachyhypopomus diazi | Unspecified | |
| Brachyhypopomus draco | Unspecified | |
| Brachyhypopomus flavipomus | Unspecified |  |
| Brachyhypopomus gauderio | Unspecified | |
| Brachyhypopomus hamiltoni | Unspecified |  |
| Brachyhypopomus hendersoni | Unspecified |  |
| Brachyhypopomus janeiroensis | Unspecified | |
| Brachyhypopomus jureiae | Unspecified |  |
| Brachyhypopomus menezesi | Unspecified | |
| Brachyhypopomus occidentalis | Unspecified | |
| Brachyhypopomus palenque | Unspecified |  |
| Brachyhypopomus pinnicaudatus | Unspecified | |
| Brachyhypopomus provenzanoi | Unspecified | |
| Brachyhypopomus regani | Unspecified |  |
| Brachyhypopomus sullivani | Unspecified |  |
| Brachyhypopomus verdii | Unspecified | |
| Brachyhypopomus walteri | Unspecified | |
| Hypopomus artedi | Unspecified | |
| Hypopygus benoneae | Unspecified | |
| Hypopygus hoedemani | Hoedeman's hypopygus | |
| Hypopygus isbruckeri | Isbrucker's hypopygus | |
| Hypopygus lepturus | Unspecified | |
| Hypopygus minissimus | Unspecified |  |
| Hypopygus neblinae | Unspecified | |
| Hypopygus nijsseni | Nijssen's hypopygus |  |
| Hypopygus ortegai | Ortega's hypopygus | |
| Microsternarchus bilineatus | Unspecified | |
| Microsternarchus brevis | Unspecified |  |
| Procerusternarchus pixuna | Unspecified | |
| Racenisia fimbriipinna | Unspecified | |
| Steatogenys duidae | Unspecified | |
| Steatogenys elegans | Barred knife-fish | |
| Steatogenys ocellatus | Unspecified | |
| Stegostenopos cryptogenes | Unspecified |  |
| Genus/Species | Common Name | Image |
|---|---|---|
| Gymnorhamphichthys bogardusi | Unspecified |  |
| Gymnorhamphichthys britskii | Unspecified | |
| Gymnorhamphichthys hypostomus | Unspecified | |
| Gymnorhamphichthys petiti | Unspecified | |
| Gymnorhamphichthys rondoni | Unspecified | |
| Gymnorhamphichthys rosamariae | Unspecified | |
| Iracema caiana | Unspecified | |
| Rhamphichthys apurensis | Unspecified | |
| Rhamphichthys atlanticus | Unspecified | |
| Rhamphichthys drepanium | Unspecified | |
| Rhamphichthys hahni | Unspecified | |
| Rhamphichthys heleios | Unspecified |  |
| Rhamphichthys lineatus | Unspecified | |
| Rhamphichthys longior | Unspecified | |
| Rhamphichthys marmoratus | Unspecified | |
| Rhamphichthys pantherinus | Unspecified | |
| Rhamphichthys rostratus | Unspecified |
| Genus/Species | Common Name | Image |
|---|---|---|
| Archolaemus blax | Unspecified | |
| Archolaemus ferreirai | Unspecified |  |
| Archolaemus janeae | Unspecified | |
| Archolaemus luciae | Unspecified |  |
| Archolaemus orientalis | Unspecified |  |
| Archolaemus santosi | Unspecified |  |
| Distocyclus conirostris | Unspecified | |
| Distocyclus goajira | Unspecified |  |
| Distocyclus guchereauae | Unspecified |  |
| Eigenmannia antonioi | Unspecified | |
| Eigenmannia besouro | Unspecified |  |
| Eigenmannia desantanai | Unspecified | |
| Eigenmannia guairaca | Unspecified |  |
| Eigenmannia humboldtii | Unspecified | |
| Eigenmannia limbata | Unspecified | |
| Eigenmannia macrops | Unspecified | |
| Eigenmannia meeki | Unspecified |  |
| Eigenmannia microstoma | Unspecified | |
| Eigenmannia nigra | Unspecified | |
| Eigenmannia trilineata | Unspecified | |
| Eigenmannia vicentespelaea | Unspecified | |
| Eigenmannia virescens | Glass knife-fish | |
| Japigny kirschbaum | Unspecified | |
| Rhabdolichops caviceps | Unspecified | |
| Rhabdolichops eastwardi | Unspecified |  |
| Rhabdolichops electrogrammus | Unspecified |  |
| Rhabdolichops jegui | Unspecified |  |
| Rhabdolichops lundbergi | Unspecified |  |
| Rhabdolichops navalha | Unspecified |  |
| Rhabdolichops nigrimans | Unspecified |  |
| Rhabdolichops stewarti | Unspecified | |
| Rhabdolichops troscheli | Unspecified | |
| Rhabdolichops zareti | Unspecified |  |
| Sternopygus aequilabiatus | Unspecified | |
| Sternopygus arenatus | Unspecified | |
| Sternopygus astrabes | Unspecified | |
| Sternopygus branco | Unspecified |  |
| Sternopygus castroi | Unspecified | |
| Sternopygus macrurus | Long-tail knife-fish | |
| Sternopygus obtusirostris | Unspecified | |
| Sternopygus pejeraton | Unspecified |  |
| Sternopygus xingu | Unspecified |