n = 6
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Hydrolycus armatus | (Jardine, 1841) | Hydrolycus armatus | Cynodontidae | |
| Hydrolycus copei | Gill, 1870 | Charax tectifer | Characidae | |
| Hydrolycus pectoralis | (Günther, 1866) | Hydrolycus scomberoides | Cynodontidae | Payara |
| Hydrolycus scomberoides | (Cuvier, 1819) | Hydrolycus scomberoides | Cynodontidae | Payara |
| Hydrolycus tatauaia | Toledo-Piza, Menezes & Santos, 1999 | Hydrolycus tatauaia | Cynodontidae | |
| Hydrolycus wallacei | Toledo-Piza, Menezes & Santos, 1999 | Hydrolycus wallacei | Cynodontidae |