n = 7
| Scientific Name | Author | Valid Name | Family | English Name |
|---|---|---|---|---|
| Thayeria boehlkei | Weitzman, 1957 | Thayeria boehlkei | Characidae | Blackline penguinfish |
| Thayeria ifati | Géry, 1959 | Thayeria ifati | Characidae | |
| Thayeria obliqua | Eigenmann, 1908 | Thayeria obliqua | Characidae | Penguinfish |
| Thayeria obliquus | Eigenmann, 1908 | Thayeria obliqua | Characidae | Penguinfish |
| Thayeria sanctae-mariae | Ladiges, 1951 | Thayeria obliqua | Characidae | Penguinfish |
| Thayeria sanctaemariae | Ladiges, 1951 | Thayeria obliqua | Characidae | Penguinfish |
| Thayeria tapajonica | Moreira & Lima, 2017 | Genus Species | New species |