| Scientific Name | Author | English Name |
|---|---|---|
| Akawaio penak | Maldonado-Ocampo, López-Fernández, Taphorn, Bernard, Crampton & Lovejoy, 2013 | |
| Brachyhypopomus alberti | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus arrayae | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus batesi | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus beebei | (Schultz, 1944) | |
| Brachyhypopomus belindae | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus benjamini | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus bennetti | Sullivan, Zuanon & Cox Fernandes, 2013 | |
| Brachyhypopomus bombilla | Loureiro & Silva, 2006 | |
| Brachyhypopomus brevirostris | (Steindachner, 1868) | Bluntnose knifefish |
| Brachyhypopomus bullocki | Sullivan & Hopkins, 2009 | |
| Brachyhypopomus cunia | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus degy | Dutra, Peixoto, Ochoa, Ohara, de Santana, Menezes & Datovo, 2021 | |
| Brachyhypopomus diazae | (Fernández-Yépez, 1972) | |
| Brachyhypopomus draco | Giora, Malabarba & Crampton, 2008 | |
| Brachyhypopomus flavipomus | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus gauderio | Giora & Malabarba, 2009 | |
| Brachyhypopomus hamiltoni | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus hendersoni | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus janeiroensis | (Costa & Campos-da-Paz, 1992) | |
| Brachyhypopomus jureiae | Triques & Khamis, 2003 | |
| Brachyhypopomus menezesi | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus occidentalis | (Regan, 1914) | |
| Brachyhypopomus palenque | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus pinnicaudatus | (Hopkins, 1991) | |
| Brachyhypopomus provenzanoi | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus regani | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus sullivani | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus verdii | Crampton, de Santana, Waddell & Lovejoy, 2017 | |
| Brachyhypopomus walteri | Sullivan, Zuanon & Cox Fernandes, 2013 | |
| Hypopomus artedi | (Kaup, 1856) | |
| Hypopygus benoneae | Peixoto, Dutra, de Santana & Wosicki, 2013 | |
| Hypopygus hoedemani | de Santana & Crampton, 2011 | Hoedeman's Hypopygus |
| Hypopygus isbruckeri | de Santana & Crampton, 2011 | Isbrücker's Hypopygus |
| Hypopygus lepturus | Hoedeman, 1962 | |
| Hypopygus minissimus | de Santana & Crampton, 2011 | |
| Hypopygus neblinae | Mago-Leccia, 1994 | |
| Hypopygus nijsseni | de Santana & Crampton, 2011 | Nijssen's Hypopygus |
| Hypopygus ortegai | de Santana & Crampton, 2011 | Ortega's Hypopygus |
| Hypopygus varii | Campos-da-Paz, 2018 | |
| Microsternarchus bilineatus | Fernández-Yépez, 1968 | |
| Microsternarchus brevis | Cox Fernandes, Nogueira, Williston & Alves-Gomes, 2015 | |
| Procerusternarchus pixuna | Cox Fernandes, Nogueira & Alves-Gomes, 2014 | |
| Racenisia fimbriipinna | Mago-Leccia, 1994 | |
| Steatogenys duidae | (La Monte, 1929) | |
| Steatogenys elegans | (Steindachner, 1880) | Barred knifefish |
| Steatogenys ocellatus | Crampton, Thorsen & Albert, 2004 | |
| Stegostenopos cryptogenes | Triques, 1997 |