| # | Species | Year | Period | From - To | Reason | Established in the wild | Ref. no. |
| 1 | Keratella cochlearis | 1978 | 1975-present | Possibly Eastern North America - Nova Scotia, Canada (open sea approx. 150 km SE of Hallifax) | accidental with ships | Unknown | 003224 |
| 2 | Pectinatella magnifica | 1883 | 18th century | North America. - Inland waters. | accidental with ships | Unknown | 003700 |
| 3 | Trochospongilla leidii | 1925-1949 | Eastern North America - Panama | ornamental | Unknown | 003224 |