| Specimen ID | 1320156 |
| Group | Mollusks-Bivalves |
| Genus | Dreissena |
| Species | polymorpha |
| Common Name | zebra mussel |
| State | IL |
| County | Calhoun |
| Locality | Swan Lake, near Grafton |
| Mapping Accuracy | Accurate |
| HUC8 Name | Lower Illinois |
| HUC8 Number | 07130011 |
| HUC10 Name | Swan Lake-Illinois River |
| HUC10 Number | 0713001110 |
| HUC12 Name | Possum Creek-Illinois River |
| HUC12 Number | 071300111006 |
| Map | |
| Collection Day | 15 |
| Collection Month | 8 |
| Collection Year | 1993 |
| Year Accuracy | Actual |
| Potential Pathway | hitch hiker on small watercraft |
| Status | established |
| Reference 1 |
| Ref. Number: | 28787 |
| Author: | Vinsel, R., and J. Tiemann |
| Date: | 2016 |
| Title: | Exotic aquatic mollusk collections in the Illinois Natural History Survey. |
| Publisher: | Illinois Natural History Survey |
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| Record Type | Specimen |
| Disposal | INHS |
| Museum Cat Number | INHS 43987 |
| Verifier | K.S. Cummings 2/2013 |
| Freshwater/Marine | Freshwater |
| Number Collected | 8 |
| Number Preserved | 8 |
