| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Amazon | River (basin) | native | 26144 |
| Machado | River (basin) | native | 97589 |
| Madeira | River (basin) | native | 26144 |
| Neotropical | Zoogeographic realm | endemic | 37395 |
| Orinoco | River (basin) | native | 26144 |
| Paraná | River (basin) | native | 26076 |
| St. Johns River | River (basin) | introduced | 95869 |
| Uruguay | River (basin) | native | 26144 |