Catenula lemnae Duges, 1832 | prior to 1974 | | | the delta and the flooded area. |
Macrostomum distinguendum Papi, 1951 | prior to 1974 | | | Danube swamps (the delta and the flooded zone), Transylvania. |
Promonotus ponticus Ax, 1959 | prior to 1974 | 3.0-5.0 m | | ten specimens from the Northern Bay, and in the Danube (fog signal), 1 km away from the river mouth. |
Gieysztoria cuspidata (Schmidt, 1861) | 1967 or earlier | | | |
Gieysztoria triquetra (Fuhrmann, 1894) | 1968 or earlier | | | In the Danube swamps. |
Castrella (Castrella) truncata (Abildgaard, 1789) | 1968 or earlier | | | In the Danube swamps (delta and the flooded zone), the stagnant waters from Transylvania and the Romanian Plain. |
Typhloplana viridata (Abildgaard, 1789) | 1970 or earlier | | | The delta and the flooded zone of the Danube. |
Strongylostoma radiatum (Müller, 1774) | 1974 or earlier | | | The delta and the flooded zone of the Danube. |
Strongylostoma elongatum spinosum Luther, 1950 | 1974 or earlier | | | The flooded zone of the Danube. |
Strongylostoma cirratum Beklemischev, 1921 | 1970 or earlier | | | In the Danube swamps. |
Mesostoma lingua (Abildgaard, 1789) | 1970 or earlier | | | Common in stagnant water of the Danube swamps and all stagnant waters. |
Bothromesostoma personatum (Schmidt, 1848) | 1970 or earlier | | | Common in the stagnant freshwater basins and in the Danube swamps. |
Polycystis naegelii Kölliker, 1845 | 1971 or earlier | | | |