Ecoregions
| ID | Realm | Major Habitat Type | Ecoregion |
|---|---|---|---|
| 343 | Neotropic | Tropical and subtropical floodplain rivers and wetland complexes | Paraguay |
| 344 | Neotropic | Tropical and subtropical upland rivers | Upper Parana |
| 345 | Neotropic | Temperate floodplain rivers and wetlands | Lower Parana |
| 346 | Neotropic | Tropical and subtropical upland rivers | Iguassu |
| 347 | Neotropic | Temperate coastal rivers | Bonaerensean Drainages |
| 348 | Neotropic | Temperate coastal rivers | Patagonia |
| 349 | Neotropic | Temperate coastal rivers | Valdivian Lakes |
| 350 | Neotropic | Oceanic Islands | Galapagos Islands |
| 351 | Neotropic | Oceanic Islands | Juan Fernandez Island |
| 352 | Neotropic | Tropical and subtropical coastal rivers | Fluminense |
| 401 | Palearctic | Polar freshwaters | Iceland - Jan Mayen |
| 402 | Palearctic | Temperate coastal rivers | Northern British Isles |
| 403 | Palearctic | Temperate coastal rivers | Cantabric Coast - Languedoc |
| 404 | Palearctic | Temperate floodplain rivers and wetlands | Central & Western Europe |
| 405 | Palearctic | Polar freshwaters | Norwegian Sea Drainages |