| Convoluta karlingi Westblad, 1946 | Jul 13, 1945 | 6 m | coarse sand |  | 
| Catenula macrura Marcus, 1945 | Dec 3, 1934 |  |  |  | 
| Philactinoposthia saliens (Graff, 1882) | prior 1975 | 4 m | sand |  | 
| Stenostomum karlingi Luther, 1960 | prior to 1960 |  |  | Henriksberg on the Hanko penninsula.  In bank meadows, on vegetation (Scirpus uniglumis, Juncus Gerardi, Agrostis stolonifera and Spergula salina) above the water level. | 
| Stenostomum karlingi Luther, 1960 | prior to 1960 |  |  | North Hangö.  Coastal groundwater, Karling. | 
| Stenostomum karlingi Luther, 1960 | prior to 1960 |  |  | Kolaviken.  Coastal groundwater, Karling. | 
| Bothriomolus balticus Meixner, 1938 | prior to 1960 |  |  | Lilla Kolaviken, large numbers, surf zone. | 
| Coelogynopora biarmata Steinböck, 1924 | prior to 1960 | 0.1 m | coarse sand | Karling. | 
| Coelogynopora hangoensis Karling, 1953 | prior to 1953 |  |  | 7 specimens.  groundwater. | 
| Vejdovskya ignava Ax, 1951 | 1962 or earlier |  | coarse sand | Karling. | 
| Baicalellia beauchampi (Ax, 1956) | 1962 or earlier | 6 m | sand | Karling. | 
| Cheliplana stylifera Karling, 1949 | Jul 13, 1936 | 6 m | coarse sand | Sand with Zostera. |