| Castrada (Castrada) intermedia (Volz, 1898) | 1913 or earlier | | | |
| Mesostoma lingua (Abildgaard, 1789) | 1913 or earlier | | | on Fucus. |
| Dalyellia armigera Schmidt, 1861 | 1932 or earlier | | | |
| Castrada (Castrada) perspicua (Fuhrmann, 1894) | 1932 or earlier | | | |
| Castrada (Castrada) stagnorum Luther, 1904 | 1932 or earlier | | | |
| Beklemischeviella contorta (Beklemischev, 1927) | prior to 1951 | | | widely distributed from Kiel (Ax 1951) and Malmö to the Gulf of Finland (Luther 1962). |
| Beklemischeviella angustior Luther, 1943 | prior to 1943 | | | found in the Baltic Sea, and at the entrance of the Gulf of Finland near Stockholm. |
| Stygoplanellina halophila Ax, 1954 | 1954 or earlier | | | |
| Placorhynchus octaculeatus octaculeatus Karling, 1931 | 1963 or earlier | | | Finnischer Meerbusen. |
| Placorhynchus echinulatus Karling, 1947 | 1974 or earlier | | | Brackwasser. Innere Ostsee. Schwedische Ostseeküste und Finnischer Meerbusen. |
| Prognathorhynchus canaliculatus Karling, 1947 | 1974 or earlier | | | und in der inneren mesohalinen Ostsee -- hier an der schwedischen Ostseeküste und im Finnischen Meerbusen bis in 15 m Wassertiefe. |
| Microdalyellia fusca (Fuhrmann, 1894) | 1955 or earlier | | | Finnischer Meerbusen. |