| Specimen ID | 4891 |
| Group | Crustaceans-Crabs |
| Genus | Carcinus |
| Species | maenas |
| Common Name | green crab |
| State | CA |
| County | Humboldt |
| Locality | Mad River Slough [between Arcata and the Pacific Ocean] |
| Mapping Accuracy | Approximate |
| HUC8 Name | Mad-Redwood |
| HUC8 Number | 18010102 |
| Map | |
| Collection Day | 17 |
| Collection Month | 9 |
| Collection Year | 1998 |
| Year Accuracy | Actual |
| Potential Pathway | shipping |
| Status | established |
| Comments | Nine adult males and 23 exuvia were collected from Mad River Slough and Bracutt Slough. |
| Record Type | Personal communication |
| Verifier | Dennis Therry, U.S. Fish and Wildlife Service, Arc |
| Freshwater/Marine | Marine |
