| Stenostomum unicolor constrictum Luther, 1960 | prior to 1960 | | | |
| Macrostomum finnlandense (Ferguson, 1940) | Sep 23, 1951 | | | 10 degrees C. bank, Potamogeton natans. |
| Baicalellia beauchampi (Ax, 1956) | Feb 10, 1948 | | | Esbo, between Lövö and Sumparn. (Purasjoki, Luther). |
| Baicalellia pusilla (Luther, 1962) | 1962 or earlier | | sand, Gyttja | sample from Purasjoki. Esbo, between Lövö and Sumparn. |
| Procerodes littoralis (Ström, 1768) | 1901 or earlier | | | Esbo. |
| Planaria torva (Müller, 1773) | 1961 or earlier | | | Binnengewässer Ostfennoskandiens. Esbo, Bodom träsk, Bach aus dem See, an Steinen u. Fontinalis antipyretica. |
| Polycelis tenuis Ijima, 1884 | 1961 or earlier | | | Esbo, Klappträsk, Tiere gelblich. |
| Polycelis tenuis Ijima, 1884 | 1961 or earlier | | | N. [map reference area, p. 42]; Esbo. |
| Dendrocoelum lacteum (Müller, 1773) | 1958 or earlier | | | Esbo = Espoo. [Ab. map area, p. 42 of Luther 1961]. |
| Dendrocoelum lacteum (Müller, 1773) | 1960 or earlier | | | Glomsän. [Ab. map area, p. 42 of Luther 1961]. |
| Castrada (Castrada) perspicua (Fuhrmann, 1894) | May 8, 1949 | | | Esbo, Bad Grankulla, Tümpel in alter Sandgrube, am Boden viel totes Erlenlaub u. Gras, ca 20 cm tief. |
| Castrada (Castrada) borealis borealis Luther, 1963 | May 8, 1949 | | | N. Esbo, Domsby, Kasaberget, Moos einer kleinen Quelle am Abhang. |
| Rhynchomesostoma rostratum (Müller, 1774) | 1963 or earlier | | | Esbo: Grankulla. |
| Bothromesostoma personatum (Schmidt, 1848) | 1963 or earlier | | | |
| Microstomum lineare (Müller, 1773) | 1960 or earlier | | | Esbo Bodom träsk |
| Castrella (Castrella) truncata (Abildgaard, 1789) | 1955 or earlier | | | |