| # | Species | Year | Period | From - To | Reason | Established in the wild | Ref. no. |
| 1 | Busycotypus canaliculatus | 1925-1949 | New York - San Francisco Bay | accidental | 125669 | ||
| 2 | Gelliodes fibrosa | unknown | Hawaii - Palmyra Atoll | biofouling | 108174 | ||
| 3 | Janua marioni | 1979 | 1975-present | Eastern Pacific - São Miguel and Faial island | accidental with ships | Unknown | 003512 |
| 4 | Watersipora arcuata | unknown | Mexico - Not specified | biofouling | Unknown | 076803 | |
| 5 | Watersipora arcuata | 18th century | Mexico - Not specified | biofouling | Unknown | 076803 |