Ecoregions
| ID | Realm | Major Habitat Type | Ecoregion |
|---|---|---|---|
| 161 | Nearctic | Xeric freshwaters and endorheic (closed) basins | Guzman - Samalayuca |
| 162 | Nearctic | Tropical and subtropical coastal rivers | Sinaloa |
| 163 | Nearctic | Xeric freshwaters and endorheic (closed) basins | Mayran - Viesca |
| 164 | Neotropic | Tropical and subtropical coastal rivers | Rio Santiago |
| 165 | Nearctic | Xeric freshwaters and endorheic (closed) basins | Lerma - Chapala |
| 166 | Nearctic | Xeric freshwaters and endorheic (closed) basins | Llanos El Salado |
| 167 | Neotropic | Tropical and subtropical coastal rivers | Panuco |
| 168 | Neotropic | Tropical and subtropical coastal rivers | Ameca - Manantlan |
| 169 | Neotropic | Tropical and subtropical coastal rivers | Rio Balsas |
| 170 | Neotropic | Tropical and subtropical coastal rivers | Sierra Madre del Sur |
| 171 | Neotropic | Tropical and subtropical coastal rivers | Papaloapan |
| 172 | Neotropic | Tropical and subtropical coastal rivers | Coatzacoalcos |
| 173 | Neotropic | Tropical and subtropical coastal rivers | Grijalva - Usumacinta |
| 174 | Neotropic | Tropical and subtropical upland rivers | Upper Usumacinta |
| 175 | Neotropic | Tropical and subtropical coastal rivers | Yucatan |