| Specimen ID | 1657398 |
| Group | Mollusks-Gastropods |
| Genus | Potamopyrgus |
| Species | antipodarum |
| Common Name | New Zealand mudsnail |
| State | CA |
| County | Humboldt |
| Locality | Mad River at mouth of Lindsay Creek |
| Mapping Accuracy | Accurate |
| HUC8 Name | Mad-Redwood |
| HUC8 Number | 18010102 |
| HUC10 Name | Lower Mad River |
| HUC10 Number | 1801010204 |
| HUC12 Name | Mill Creek-Mad River |
| HUC12 Number | 180101020408 |
| Map | |
| Collection Day | 7 |
| Collection Month | 10 |
| Collection Year | 2020 |
| Year Accuracy | Actual |
| Potential Pathway | dispersed | hitch hiker |
| Status | established |
| Comments | High density patches in Mad River from 1/10 mi downstream to Lindsay Cr. mouth |
| Record Type | NAS sighting report |
| Verifier | L. Breck McAlexander (CDFW) |
| Freshwater/Marine | Freshwater |
| Number Collected | 300 |
