| Avagina aurita Meixner, 1938 | | w | latest taxonomic authority |
| Mecynostomum lutheri (Westblad, 1946) | | w | latest taxonomic authority |
| Catenulidae Catenula Duges, 1832 | [with synonyms] | w | latest taxonomic authority |
| Stenostomidae Rhynchoscolex simplex Leidy, 1851 | [with synonyms] | w | latest taxonomic authority |
| Catenulida Stenostomidae Vejdovsky, 1880 | | w | latest taxonomic authority |
| Stenostomidae Stenostomum Schmidt, 1848 | [with synonyms] | w | other taxonomic work |
| Stenostomidae Stenostomum leucops (Duges, 1828) | [with synonyms] | w | other taxonomic work |
| Stenostomum middendorffii Braun, 1885 | | w | latest taxonomic authority |
| Stenostomum tenuicauda Graff, 1911 | | w | other taxonomic work |
| Stenostomum tenuicaudatum Nuttycombe & Waters, 1938 | | w | latest taxonomic authority |
| Stenostomum torneense Schmidt, 1852 | | w | latest taxonomic authority |
| Anokkostenostomum tuberculosum (Nuttycombe & Waters, 1938) | | w | other taxonomic work |
| Stenostomidae Stenostomum unicolor Schmidt, 1848 | [with synonyms] | w | latest taxonomic authority |
| Archimonotresis limophila Meixner, 1938 | [with synonyms] | w | other taxonomic work |
| Prorhynchidae Geocentrophora de Man, 1876 | | w | latest taxonomic authority |
| Geocentrophora sphyrocephala de Man, 1876 | [with synonyms] | w | latest taxonomic authority |
| Macrostomidae Macrostomum appendiculatum (1) Beklemischev, 1951 | | w | latest taxonomic authority |
| Macrostomidae Macrostomum balticum Luther, 1947 | | w | latest taxonomic authority |
| Macrostomum bulbostylum Kepner & Stiff, 1932 | | w | latest taxonomic authority |
| Macrostomum distinguendum Papi, 1951 | [with synonyms] | w | other taxonomic work |
| Macrostomidae Macrostomum finnlandense (Ferguson, 1940) | [with synonyms] | w | latest taxonomic authority |
| Macrostomum hamatum Luther, 1947 | | w | other taxonomic work |
| Macrostomidae Macrostomum hystricinum Beklemischev, 1951 | [with synonyms] | w | latest taxonomic authority |
| Macrostomum karlingi Papi, 1953 | | w | other taxonomic work |
| Macrostomum lacustre Beklemischev, 1951 | | w | latest taxonomic authority |
| Macrostomum lutheri Beklemischev, 1927 | [with synonyms] | w | latest taxonomic authority |
| Macrostomum minutum Luther, 1947 | [with synonyms] | w | other taxonomic work |
| Macrostomidae Macrostomum orthostylum Braun, 1885 | | w | latest taxonomic authority |
| Macrostomum spirale Schulz & Meyer, 1939 | | w | latest taxonomic authority |
| Macrostomum spirale Ax, 1956 | | w | other taxonomic work |
| Macrostomum viride (2) Luther, 1918 | | w | latest taxonomic authority |
| Macrostomum viride (3) Marcus, 1946 | | w | latest taxonomic authority |
| Macrostomidae Macrostomum viride (4) Papi, 1951 | | w | latest taxonomic authority |
| Bothrioplana alacris Sekera, 1889 | | w | latest taxonomic authority |
| Bothrioplana bohemica Vejdovsky, 1895 | | w | latest taxonomic authority |
| Bothrioplana brauni Zacharias, 1886 | | w | latest taxonomic authority |
| Bothrioplana dorpatensis Braun, 1881 | | w | latest taxonomic authority |
| Bothrioplana silesiaca Zacharias, 1886 | | w | latest taxonomic authority |
| Bothrioplanidae Euporobothria Graff, 1909 | | w | latest taxonomic authority |
| Euporobothria bohemica (Vejdovsky, 1895) | | w | latest taxonomic authority |
| Euporobothria dorpatensis (Braun, 1881) | | w | latest taxonomic authority |
| Archiloa spinosa (Jensen, 1878) | | w | latest taxonomic authority |
| Bothriomolus balticus Meixner, 1938 | | w | latest taxonomic authority |
| Bothriomolus constrictus Hallez, 1909 | | w | latest taxonomic authority |
| Otomesostoma auditivum (Du Plessis, 1874) | [with synonyms] | w | latest taxonomic authority |
| Monotus fusca (Ørsted, 1843) | | w | latest taxonomic authority |
| Monotus lineatus OF Mueller, 1773 | | w | latest taxonomic authority |
| Stenostomidae Myostenostomum Luther, 1960 | | w | primary taxonomic authority (describer) |
| Myostenostomum bulbocaudatum Luther, 1960 | | w | primary taxonomic authority (describer) |
| Stenostomum bryophilum Luther, 1960 | | w | primary taxonomic authority (describer) |
| Stenostomum constrictum Papi in Luther, 1960 | [with synonyms] | w | primary taxonomic authority (describer) |
| Stenostomum grabbskogense Luther, 1960 | [with synonyms] | w | primary taxonomic authority (describer) |
| Stenostomum karlingi Luther, 1960 | [with synonyms] | w | primary taxonomic authority (describer) |
| Stenostomum leucops aquariorum Luther, 1960 | | w | primary taxonomic authority (describer) |
| Stenostomum sphagnetorum Papi in Luther, 1960 | | w | primary taxonomic authority (describer) |
| Stenostomum unicolor constrictum Luther, 1960 | | w | primary taxonomic authority (describer) |
| Stenostomum unicolor unicolor Luther, 1960 | | w | primary taxonomic authority (describer) |
| Monocelis lineata (Müller OF, 1773) | [with synonyms] | w | other taxonomic work |
| Mecynostomidae Mecynostomum auritum (Schultze, 1851) | [with synonyms] | w | other taxonomic work |
| Mecynostomidae Childia groenlandica (Levinsen, 1879) | [with synonyms] | w | other taxonomic work |
| Anaperus tvaerminnensis (Luther, 1912) | | w | other taxonomic work |
| Mecynostomidae Mecynostomum auritum (Schultze, 1851) | [with synonyms] | w | other taxonomic work |
| Convolutidae Convoluta saliens (Graff, 1882) | | w | other taxonomic work |
| Convoluta karlingi Westblad, 1946 | | w | other taxonomic work |
| Catenula lemnae Duges, 1832 | [with synonyms] | w | other taxonomic work |
| Catenula turgida (Zacharias, 1902) | [with synonyms] | w | other taxonomic work |
| Macrostomum rostratum Papi, 1951 | [with synonyms] | w | other taxonomic work |
| Macrostomidae Macrostomum obtusum Vejdovsky, 1895 | | w | other taxonomic work |
| Macrostomum curvituba Luther, 1947 | | w | other taxonomic work |
| Macrostomum tenuicauda Luther, 1947 | | w | other taxonomic work |
| Macrostomidae Macrostomum tuba Graff, 1882 | [with synonyms] | w | other taxonomic work |
| Dolichomacrostomum uniporum Luther, 1947 | | w | other taxonomic work |
| Prorhynchidae Prorhynchus stagnalis Schultze, 1851 | [with synonyms] | w | other taxonomic work |
| Geocentrophora baltica (Kennel, 1883) | [with synonyms] | w | other taxonomic work |
| Plagiostomum lemani Forel & Du Plessis, 1874 | | w | other taxonomic work |
| Bothrioplana semperi Braun, 1881 | [with synonyms] | w | other taxonomic work |
| Paramonotus hamatus (Jensen, 1878) | [with synonyms] | w | other taxonomic work |
| Promonotus schultzei Meixner, 1943 | [with synonyms] | w | other taxonomic work |
| Archilopsis unipunctata (Fabricius, 1826) | [with synonyms] | w | other taxonomic work |
| Minona baltica Karling & Kinnander, 1953 | | w | other taxonomic work |
| Philosyrtis fennica Ax, 1954 | | w | other taxonomic work |
| Pseudosyrtis subterranea (Ax, 1951) | [with synonyms] | w | other taxonomic work |
| Coelogynopora biarmata Steinböck, 1924 | [with synonyms] | w | other taxonomic work |
| Coelogynopora schulzii Meixner, 1938 | | w | other taxonomic work |
| Coelogynopora hangoensis Karling, 1953 | | w | other taxonomic work |
| Anokkostenostomum grabbskogense (Luther, 1960) | | w | primary taxonomic authority (describer) |
| Anokkostenostomum karlingi (Luther, 1960) | | w | primary taxonomic authority (describer) |
| Stenostomum amphotum Marcus, 1945 | | w | other taxonomic work |
| Stenostomum leucops leucops (Duges, 1828) | [with synonyms] | w | latest taxonomic authority |
| Stenostomum tuberculosum Nuttycombe & Waters, 1938 | [with synonyms] | w | other taxonomic work |
| Myostenostomum tauricum (Nasonov, 1924) | [with synonyms] | w | other taxonomic work |
| Stenostomidae Rhynchoscolex simplex Leidy, 1851 | [with synonyms] | w | other taxonomic work |
| Rhynchoscolex simplex plotnikovi Beklemischev, 1923 | | w | other taxonomic work |
| Macrostomorpha Macrostomida Karling, 1940 | | w | other taxonomic work |
| Microstomidae Microstomum lineare (Müller OF, 1773) | [with synonyms] | w | other taxonomic work |
| Macrostomidae Macrostomum Schmidt, 1848 | [with synonyms] | w | other taxonomic work |
| Dolichomacrostominae Dolichomacrostomum Luther, 1947 | | w | other taxonomic work |
| Prolecithophora Combinata Karling, 1940 | | w | other taxonomic work |
| Protomonotresinae Archimonotresis Meixner, 1938 | [with synonyms] | w | other taxonomic work |
| Prolecithophora Separata Reisinger, 1924 | | w | other taxonomic work |
| Macrostomum appendiculatum (1) finnlandensis Ferguson, 1940 | | w | latest taxonomic authority |
