| Stenostomum leucops (Duges, 1828) | prior to 1974 | | | Numerous specimens. among plants in a swamp near the fisheries station. |
| Stenostomum unicolor Schmidt, 1848 | prior to 1974 | | | |
| Catenula lemnae Duges, 1832 | prior to 1974 | | | Numerous specimens. |
| Macrostomum hystricinum Beklemischev, 1951 | prior to 1974 | | | Golovitza, the endo of Sinoë Lake. predeltaic sector: Ciotic-Zaton, the south of Sahalin Island. Numerous specimens. |
| Gieysztoria cuspidata (Schmidt, 1861) | 1974 or earlier | | | among plants, very numerous. |
| Gieysztoria triquetra (Fuhrmann, 1894) | 1970 or earlier | | | Very numerous, in Golovitza, Dolosman, Portitza. |
| Mesostoma lingua (Abildgaard, 1789) | 1974 or earlier | | | very numerous. |
| Gyratrix hermaphroditus Ehrenberg, 1831 | 1974 or earlier | | | |
| Pontaralia beklemichevi Mack-Fira, 1968 | Jul 31, 1969 | | | in great numbers, among algae. |
| Pontaralia beklemichevi Mack-Fira, 1968 | Sep 20, 1969 | | | in great numbers, among algae. |
| Pontaralia relicta (Beklemischev, 1927) | Jul 31, 1969 | | | One specimen, among algae. |