Ecosystems where Oligosarcus jenynsii occurs
n = 5
| Ecosystem | Type | Status | Ref. |
|---|---|---|---|
| Iguazú River | River (basin) | native | 56308 |
| Neotropical | Zoogeographic realm | endemic | 38376 |
| Paraná | River (basin) | native | 11229 |
| Patos Lagoon | Lagoon | native | 58359 |
| Uruguay | River (basin) | native | 56308 |