| # | Species | Year | Period | From - To | Reason | Established in the wild | Ref. no. |
| 1 | Carcinus maenas | 1975-present | Europe - San Francisco Bay, California | unknown | yes | 080617 | |
| 2 | Teredo navalis | 1914 | 1900-1924 | Northeast Atlantic - Mare Island, San Francisco, California | accidental with ships | yes | 078117 |