| Specimen ID | 241707 |
| Group | Mollusks-Gastropods |
| Genus | Potamopyrgus |
| Species | antipodarum |
| Common Name | New Zealand mudsnail |
| State | CA |
| County | Contra Costa |
| Locality | West Antioch Creek in Antioch |
| Mapping Accuracy | Accurate |
| HUC8 Name | San Joaquin Delta |
| HUC8 Number | 18040003 |
| HUC10 Name | Middle River-San Joaquin River |
| HUC10 Number | 1804000309 |
| HUC12 Name | Markley Canyon-San Joaquin River |
| HUC12 Number | 180400030907 |
| Map | |
| Collection Day | 2 |
| Collection Month | 5 |
| Collection Year | 2007 |
| Year Accuracy | Actual |
| Potential Pathway | hitch hiker |
| Status | established |
| Reference 1 |
| Ref. Number: | 19769 |
| Author: | Montana State University. |
| Date: | 2011 |
| Title: | New Zealand mudsnails in the Western USA dataset (1995-2010). |
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| Comments | Density = abundant. This sighting has been confirmed with additional samples and the identification by 3 different experts. |
| Record Type | Literature |
| Museum Cat Number | WAN080 |
| Verifier | Tom King, BioAssessment Services Lab |
| Freshwater/Marine | Freshwater |
