n = 11
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Hypopomus artedi | (Kaup, 1856) | Hypopomus artedi | Hypopomidae | |
| Hypopomus artedii | (Kaup, 1856) | Hypopomus artedi | Hypopomidae | |
| Hypopomus beebei | Schultz, 1944 | Brachyhypopomus beebei | Hypopomidae | |
| Hypopomus brevirostris | (Steindachner, 1868) | Brachyhypopomus brevirostris | Hypopomidae | Bluntnose knifefish |
| Hypopomus diazae | Fernández-Yépez, 1972 | Brachyhypopomus diazae | Hypopomidae | |
| Hypopomus diazi | Fernández-Yépez, 1972 | Brachyhypopomus diazae | Hypopomidae | |
| Hypopomus janeiroensis | Costa & Campos-da-Paz, 1992 | Brachyhypopomus janeiroensis | Hypopomidae | |
| Hypopomus muelleri | (Kaup, 1856) | Hypopomus artedi | Hypopomidae | |
| Hypopomus mulleri | (Kaup, 1856) | Hypopomus artedi | Hypopomidae | |
| Hypopomus occidentalis | Regan, 1914 | Brachyhypopomus occidentalis | Hypopomidae | |
| Hypopomus pinnicaudatus | Hopkins, 1991 | Brachyhypopomus pinnicaudatus | Hypopomidae |