| Microstomum giganteum Hallez, 1878 | 1913 or earlier | | | |
| Microstomum caudatum Leidy, 1852 | | | | In puddles and in small brooks of North America (New Jersey, Michigan, Pennsylvania), Denmark. |
| Macrostomum viride (1) Beneden E, 1870 | 1913 or earlier | | | found in the country of Denmark. |
| Dalyellia rubra (Fuhrmann, 1894) | 1913 or earlier | | | pools. very lively. |
| Dalyellia cuspidata (Schmidt, 1861) | 1913 or earlier | 30-40 m | | pools and lakes. |
| Dalyellia viridis (Shaw, 1791) | 1913 or earlier | | | |
| Dalyellia penicilla (Braun, 1885) | 1913 or earlier | | | |
| Phaenocora unipunctata (Ørsted, 1843) | 1913 or earlier | | | |
| Phaenocora typhlops (Vejdovsky, 1880) | 1913 or earlier | | | pools. |
| Strongylostoma radiatum (Müller, 1774) | 1913 or earlier | | | ponds and lakes. |
| Rhynchomesostoma rostratum (Müller, 1774) | 1913 or earlier | | | |
| Tetracelis marmorosa (Müller, 1773) | 1913 or earlier | | | standing puddles and lakes. |
| Typhloplana viridata (Abildgaard, 1789) | 1913 or earlier | | | moors and lakes. |
| Castrada (Castrada) perspicua (Fuhrmann, 1894) | 1913 or earlier | | | pools and lakes. |
| Castrada (Castrada) hofmanni Braun, 1885 | 1913 or earlier | | | |
| Castrada (Castrada) viridis Volz, 1898 | 1913 or earlier | | | |
| Castrada (Castrada) intermedia (Volz, 1898) | 1913 or earlier | | | |
| Castrada (Castrada) armata (Fuhrmann, 1894) | 1913 or earlier | | | mud of pools and lakes, and littoral zone. |
| Mesostoma productum (Schmidt, 1848) | 1913 or earlier | | | puddles and lakes of Europe. |
| Mesostoma lingua (Abildgaard, 1789) | 1913 or earlier | | | mud and detritus, of pools, ponds and lakes. |
| Mesostoma ehrenbergii (Focke, 1836) | 1913 or earlier | | | |
| Mesostoma tetragonum (Müller, 1774) | 1913 or earlier | | | |
| Mesostoma rhynchotum Braun, 1885 | 1913 or earlier | | | |
| Mesostoma nigrirostrum Braun, 1885 | 1913 or earlier | | | |
| Bothromesostoma essenii Braun, 1885 | 1913 or earlier | | | |
| Plagiostomum lemani Forel & Du Plessis, 1874 | 1913 or earlier | | mud | alpine lakes |
| Planaria torva (Müller, 1773) | 1844 or earlier | | | Dänemark allgemein. |
| Dugesia lugubris (Schmidt, 1861) | 1923 or earlier | | | Übrige Verbreitung der Kollektivart. Brittische Inseln, Mittel- u. Südschweden, Dänemark, ganz West- u. Mitteleuropa, Lettland. Littauen, Polen, Tschechoslovakei, Ungarn, ..... |
| Bdellocephala punctata (Pallas, 1774) | 1948 and earlier | | | Dänemark, relativ häufig |
| Opistomum pallidum Schmidt, 1848 | 1905 or earlier | | | Dänemark. |
| Castrada (Castrada) perspicua (Fuhrmann, 1894) | 1905 or earlier | | | Schweden, Sarek-Gebirge |
| Castrada (Castrada) hofmanni Braun, 1885 | 1905 or earlier | | | Dänemark |
| Castrada (Castrada) intermedia (Volz, 1898) | 1905 or earlier | | | |
| Castrada (Castrada) viridis Volz, 1898 | 1905 or earlier | | | |
| Castrada (Castrada) neocomensis Volz, 1898 | 1905 or earlier | | | |
| Castrada (Castrada) armata (Fuhrmann, 1894) | 1905 or earlier | | | Dänemark. |
| Strongylostoma radiatum (Müller, 1774) | 1961 or earlier | | | Dänemark: mehrere Seen. |
| Mesostoma ehrenbergii (Focke, 1836) | 1844 or earlier | | | Dänemark. |
| Mesostoma ehrenbergii (Focke, 1836) | 1905 or earlier | | | Dänemark. |
| Mesostoma ehrenbergii (Focke, 1836) | 1938 or earlier | | | Dänemark. |
| Mesostoma productum (Schmidt, 1848) | 1905 or earlier | | | |
| Mesostoma craci Schmidt, 1858 | 1905 or earlier | | | |
| Mesostoma tetragonum (Müller, 1774) | 1773 or earlier | | | |
| Mesostoma tetragonum (Müller, 1774) | 1905 or earlier | | | |
| Mesostoma rhynchotum Braun, 1885 | 1905 or earlier | | | |
| Mesostoma nigrirostrum Braun, 1885 | 1905 or earlier | | | |
| Phaenocora typhlops (Vejdovsky, 1880) | 1905 or earlier | | | |
| Phaenocora unipunctata (Ørsted, 1843) | 1905 or earlier | | | |
| Gieysztoria cuspidata (Schmidt, 1861) | 1905 or earlier | | | Teich in Böndernes Hegn |