Microstomum lineare (Müller, 1773) | 1974 or earlier | | | numerous specimens, in predeltaic sector. |
Gieysztoria triquetra (Fuhrmann, 1894) | 1970 or earlier | | | Very numerous, in the freshwater are of the 'melea' of the Sahalin Island and the Northern Bay, 10 to 30 cm depth, among plants. |
Castrella (Castrella) truncata (Abildgaard, 1789) | 1970 or earlier | | | a few specimens, from the freshwater area of the 'melea', Sahalin Island, predeltaic region. |
Typhloplana viridata (Abildgaard, 1789) | 1974 or earlier | | | a few specimens, among Salvinia natans, from the freshwater area of the 'melea', Sahalin Island, predeltaic region. |
Strongylostoma radiatum (Müller, 1774) | 1974 or earlier | | | Numerous specimens, freshwater area of the 'melea' Sahalin. |
Strongylostoma cirratum Beklemischev, 1921 | 1974 or earlier | | | Numerous specimens, among plants, predeltaic region, freshwater area of 'melea' Sahalin. |
Papiella otophthalma (Plotnikow, 1906) | 1974 or earlier | | | Abundant, predeltaic region, the freshwater area of the 'melea' Sahalin. |
Mesostoma lingua (Abildgaard, 1789) | 1974 or earlier | | | very numerous, predeltaic region: in the freshwter sector of the Sahalin Island 'melea', among plants. |