n = 11
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Hypomasticus copelandii | (Steindachner, 1875) | Hypomasticus copelandii | Anostomidae | |
| Hypomasticus despaxi | (Puyo, 1943) | Hypomasticus despaxi | Anostomidae | |
| Hypomasticus garmani | (Borodin, 1929) | Megaleporinus garmani | Anostomidae | |
| Hypomasticus julii | (Santos, Jégu & Lima, 1996) | Hypomasticus julii | Anostomidae | |
| Hypomasticus lineomaculatus | Birindelli, Peixoto, Wosiacki & Britski, 2013 | Hypomasticus lineomaculatus | Anostomidae | |
| Hypomasticus megalepis | (Günther, 1863) | Hypomasticus megalepis | Anostomidae | |
| Hypomasticus mormyrops | (Steindachner, 1875) | Hypomasticus mormyrops | Anostomidae | |
| Hypomasticus pachycheilus | (Britski, 1976) | Hypomasticus pachycheilus | Anostomidae | |
| Hypomasticus santanai | Birindelli & Melo, 2020 | Genus Species | New species | |
| Hypomasticus steindachneri | (Eigenmann, 1907) | Hypomasticus steindachneri | Anostomidae | |
| Hypomasticus thayeri | (Borodin, 1929) | Hypomasticus thayeri | Anostomidae |