| Bryozoans | Amathia distans | 1889 | |
| Bryozoans | Amathia verticillata | 1977 | |
| Crustaceans-Barnacles | Amphibalanus amphitrite | None | |
| Algae | Antithamnionella spirographidis* | 1950 | |
| Tunicates | Ascidiella aspersa | 1952 | |
| Entoprocts | Barentsia benedeni | 1997 | |
| Tunicates | Botryllus schlosseri | 1955 | |
| Bryozoans | Bowerbankia gracilis | None | |
| Bryozoans | Bugula neritina | 1975 | |
| Bryozoans | Bugulina flabellata | 1977 | |
| Bryozoans | Bugulina simplex | 1983 | |
| Bryozoans | Bugulina stolonifera | 1977 | |
| Crustaceans-Crabs | Carcinus maenas | 1976 | |
| Algae | Caulerpa taxifolia (invasive genotype) | 2002 | |
| Tunicates | Ciona robusta | 1952 | |
| Algae | Codium fragile ssp. Fragile | 2002 | |
| Cnidarians-Hydrozoans | Cordylophora caspia | 2006 | |
| Bryozoans | Cryptosula pallasiana | 1977 | |
| Algae | Elachista nigra | 1976 | |
| Crustaceans-Isopods | Eurylana arcuata | 1981 | |
| Cnidarians-Anthozoans | Exaiptasia pallida | None | |
| Algae | Leptosiphonia brodiei* | 1973 | |
| Crustaceans-Amphipods | Monocorophium acherusicum | 2001 | |
| Mollusks-Gastropods | Myosotella myosotis | 1877 | |
| Crustaceans-Isopods | Paracerceis sculpta | 2000 | |
| Mollusks-Gastropods | Polycera hedgpethi | 1998 | |
| Annelids-Polychaetes | Polydora cornuta | 1979 | |
| Annelids-Polychaetes | Polydora hoplura | 1971 | |
| Annelids-Polychaetes | Pseudopolydora paucibranchiata | 1997 | |
| Bryozoans | Schizoporella unicornis | 1975 | |
| Algae | Stictyosiphon soriferus* | 1975 | |
| Algae | Striaria attenuata* | 1978 | |
| Tunicates | Styela plicata | 1952 | |
| Mollusks-Bivalves | Teredo navalis | 1931 | |
| Mollusks-Gastropods | Thecacera pennigera | 2005 | |
| Bryozoans | Watersipora arcuata | 1953 | |
| Bryozoans | Watersipora subtorquata | 1977 | |