| Convoluta saliens (Graff, 1882) | prior 1960 | | | Westblad |
| Macrostomum balticum Luther, 1947 | prior to 1960 | 0.5-3.0 m | sand | All specimens found between June and August. |
| Macrostomum curvituba Luther, 1947 | prior to 1960 | | | |
| Monocelis lineata (Müller, 1773) | prior to 1960 | | | |
| Paramonotus hamatus (Jensen, 1878) | prior to 1960 | 8-12 m | | 10-15 cm |
| Archilopsis unipunctata (Fabricius, 1826) | prior to 1960 | | | |
| Bothriomolus balticus Meixner, 1938 | prior to 1960 | | | Otoplanenzone. |
| Pseudosyrtis subterranea (Ax, 1951) | prior to 1954 | | | coastal groundwater zone. |
| Coelogynopora biarmata Steinböck, 1924 | Aug 1950 | | | Otoplanenzone. Kinnander. |
| Macrostomum balticum Luther, 1947 | Jun 18, 1934 | 5 m | coarse sand | |
| Beklemischeviella contorta (Beklemischev, 1927) | prior to 1943 | | Quartz Sand | Dr. Karling found this species near Lappvik, and also Hangö, in vegetation free quartz sand |
| Provortex balticus (Schultze, 1851) | 1962 or earlier | | | coastal groundwater, under the soil surface. |
| Provortex balticus (Schultze, 1851) | 1962 or earlier | 0-34 m | | widely distributed in littoral/supralitoral from Hangö in the north to Jussarö and Lappvik. Also Tvärminne Storfjärd, Schären?. Vegetation: Fucus, Furcellaria, Ceramium, Potamogeton, Myriophyllum, Zannichellia, Chara, etc. Mytilus-Biocönosen. |
| Vejdovskya ignava Ax, 1951 | 1962 or earlier | 3 m | fine sand | Tvärminne, Henriksberg, Högholmen. Karling. |
| Hangethellia calceifera Karling, 1940 | 1940 or earlier | 16 m | coarse sand, sand | variety of sand sizes. |
| Baicalellia pusilla (Luther, 1962) | 1962 or earlier | | | Karling. |
| Balgetia semicirculifera Karling, 1962 | 1962 or earlier | 5 m | coarse sand | |
| Anthopharynx vaginatus Karling, 1940 | 1963 or earlier | 4-20 m | sand | Gebiet von Henriksberg, Sand mit Detritus oder Schlick, (Karling). |