| Oligochoerus sp. (Mack-Fira, 1974) | prior to 1974 | | | A few specimens. The lagoon complex Razelm-Sinoë: Golovitza Lake, in the freshwater area of the 'melea' of Sahalin. |
| Microstomum lineare (Müller, 1773) | 1974 or earlier | | | numerous specimens. |
| Plagiostomum lemani Forel & Du Plessis, 1874 | 1974 or earlier | | | |
| Promonotus sp. (Mack-Fira, 1974) | prior to 1974 | | | five specimens. |
| Microdalyellia fusca (Fuhrmann, 1894) | 1974 or earlier | | | Golovitza Lake (among Enteromorpha). |
| Gieysztoria cuspidata (Schmidt, 1861) | 1974 or earlier | | | among plants, very numerous. |
| Gieysztoria macrovariata (Weise, 1942) | Aug 4, 1970 | | | Few specimens, Portitza, swamp with a rich vegetation. |
| Strongylostoma elongatum spinosum Luther, 1950 | 1974 or earlier | | | Numerous specimens. |
| Phonorhynchoides flagellatus Beklemischev, 1927 | Aug 1970 | | | The lagoon complex Razelm-Sinoë: Golovitza Lake. |