| Avagina aurita Meixner, 1938 | | w | latest taxonomic authority | |
| Mecynostomum lutheri (Westblad, 1946) | | w | latest taxonomic authority | 15-17, figs 2 A-B |
| 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 | 51 |
| 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 | 99-101, figs. 25 A-C |
| Prorhynchidae Geocentrophora de Man, 1876 | | w | latest taxonomic authority | 94-96 |
| Geocentrophora sphyrocephala de Man, 1876 | [with synonyms] | w | latest taxonomic authority | 96-98, figs. 24 a-c, g, h, l-o |
| Macrostomidae Macrostomum appendiculatum (1) Beklemischev, 1951 | | w | latest taxonomic authority | |
| Macrostomidae Macrostomum balticum Luther, 1947 | | w | latest taxonomic authority | 78-79 |
| Macrostomum bulbostylum Kepner & Stiff, 1932 | | w | latest taxonomic authority | |
| Macrostomum distinguendum Papi, 1951 | [with synonyms] | w | other taxonomic work | 73-74 |
| Macrostomidae Macrostomum finnlandensis (Ferguson, 1940) | [with synonyms] | w | latest taxonomic authority | 72-73 |
| Macrostomum hamatum Luther, 1947 | | w | other taxonomic work | 79-81, fig. 19 |
| Macrostomidae Macrostomum hystricinum Beklemischev, 1951 | [with synonyms] | w | latest taxonomic authority | 67-71, Abb 17 A. |
| Macrostomum karlingi Papi, 1953 | | w | other taxonomic work | 74-75 |
| Macrostomum lacustre Beklemischev, 1951 | | w | latest taxonomic authority | |
| Macrostomum lutheri Beklemischev, 1927 | [with synonyms] | w | latest taxonomic authority | 81-82 |
| Macrostomum minutum Luther, 1947 | [with synonyms] | w | other taxonomic work | 88-89 |
| Macrostomidae Macrostomum orthostylum Braun, 1885 | | w | latest taxonomic authority | 75-77, Abb. 18 D u. F |
| 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 | 125-132, figs. 32-35 |
| Bothriomolus constrictus Hallez, 1909 | | w | latest taxonomic authority | |
| Otomesostoma auditivum (Du Plessis, 1874) | [with synonyms] | w | latest taxonomic authority | 108-112, figs. 27 a-c |
| 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) | 52 |
| Myostenostomum bulbocaudatum Luther, 1960 | | w | primary taxonomic authority (describer) | 52-58, figs 13, 14, 15 |
| Stenostomum bryophilum Luther, 1960 | | w | primary taxonomic authority (describer) | 43-45, Abb. 6 G-L, 9 A-E, ?K-L |
| Stenostomum constrictum Papi in Luther, 1960 | [with synonyms] | w | primary taxonomic authority (describer) | 154 |
| Stenostomum grabbskogense Luther, 1960 | [with synonyms] | w | primary taxonomic authority (describer) | 47-49 |
| Stenostomum karlingi Luther, 1960 | [with synonyms] | w | primary taxonomic authority (describer) | 46-47 |
| Stenostomum leucops aquariorum Luther, 1960 | | w | primary taxonomic authority (describer) | 35 |
| Stenostomum sphagnetorum Papi in Luther, 1960 | | w | primary taxonomic authority (describer) | |
| Stenostomum unicolor constrictum Luther, 1960 | | w | primary taxonomic authority (describer) | 41 |
| Stenostomum unicolor unicolor Luther, 1960 | | w | primary taxonomic authority (describer) | |
| Monocelis lineata (Müller OF, 1773) | [with synonyms] | w | other taxonomic work | 112-113, figs 26 e-i |
| Mecynostomidae Mecynostomum auritum (Schultze, 1851) | [with synonyms] | w | other taxonomic work | 17-19 |
| Mecynostomidae Childia groenlandica (Levinsen, 1879) | [with synonyms] | w | other taxonomic work | 12-14, Fig. 1A-B |
| Anaperus tvaerminnensis (Luther, 1912) | | w | other taxonomic work | 14, Abb. 1C-E |
| Mecynostomidae Mecynostomum auritum (Schultze, 1851) | [with synonyms] | w | other taxonomic work | 17-19, Fig 2 C-F |
| Convolutidae Convoluta saliens (Graff, 1882) | | w | other taxonomic work | 19-21, fig. 3 A-D |
| Convoluta karlingi Westblad, 1946 | | w | other taxonomic work | 21-22, Fig 3 E-F |
| Catenula lemnae Duges, 1832 | [with synonyms] | w | other taxonomic work | 23-24 |
| Catenula turgida (Zacharias, 1902) | [with synonyms] | w | other taxonomic work | 24-27 |
| Macrostomum rostratum Papi, 1951 | [with synonyms] | w | other taxonomic work | 71-72 |
| Macrostomidae Macrostomum obtusum Vejdovsky, 1895 | | w | other taxonomic work | 77-78 |
| Macrostomum curvituba Luther, 1947 | | w | other taxonomic work | 83-84 |
| Macrostomum tenuicauda Luther, 1947 | | w | other taxonomic work | 84-85 |
| Macrostomidae Macrostomum tuba Graff, 1882 | [with synonyms] | w | other taxonomic work | 85-88, figs. 20-21 |
| Dolichomacrostomum uniporum Luther, 1947 | | w | other taxonomic work | 89-91, fig. 22 |
| Prorhynchidae Prorhynchus stagnalis Schultze, 1851 | [with synonyms] | w | other taxonomic work | 93-94, fig. 23 |
| Geocentrophora baltica (Kennel, 1883) | [with synonyms] | w | other taxonomic work | 98-99, figs. 24, D-F, I, K |
| Plagiostomum lemani Forel & Du Plessis, 1874 | | w | other taxonomic work | 101-105, fig. 26a |
| Bothrioplana semperi Braun, 1881 | [with synonyms] | w | other taxonomic work | 106-108, figs. 26 B-D |
| Paramonotus hamatus (Jensen, 1878) | [with synonyms] | w | other taxonomic work | 114-116, figs. 28 a-b |
| Promonotus schultzei Meixner, 1943 | [with synonyms] | w | other taxonomic work | 116-118, figs. 29 a-e |
| Archilopsis unipunctata (Fabricius, 1826) | [with synonyms] | w | other taxonomic work | 118-121, figs. 29 f-k |
| Minona baltica Karling & Kinnander, 1953 | | w | other taxonomic work | 121-124, figs. 30, 31 |
| Philosyrtis fennica Ax, 1954 | | w | other taxonomic work | 133-134, figs. 36 a, c, d, figs. 37 d |
| Pseudosyrtis subterranea (Ax, 1951) | [with synonyms] | w | other taxonomic work | 135, figs. 36 b, 37 a-c |
| Coelogynopora biarmata Steinböck, 1924 | [with synonyms] | w | other taxonomic work | 138-141, figs. 38 a-e |
| Coelogynopora schulzii Meixner, 1938 | | w | other taxonomic work | 140-142, figs. 39 b, c, e, f1, f3 |
| Coelogynopora hangoensis Karling, 1953 | | w | other taxonomic work | 142-143, figs. 39 a, d |
| 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 | 29-35, Figs. 5 A-T |
| Stenostomum tuberculosum Nuttycombe & Waters, 1938 | [with synonyms] | w | other taxonomic work | 49-51, Abb. 12 |
| Myostenostomum tauricum (Nasonov, 1924) | [with synonyms] | w | other taxonomic work | 58-59, Abb. 12 f, g |
| Stenostomidae Rhynchoscolex simplex Leidy, 1851 | [with synonyms] | w | other taxonomic work | 59-60, Abb. 4 E-I, S.25 |
| Rhynchoscolex simplex plotnikovi Beklemischev, 1923 | | w | other taxonomic work | 60 |
| Macrostomorpha Macrostomida Karling, 1940 | | w | other taxonomic work | 60-61 |
| Microstomidae Microstomum lineare (Müller OF, 1773) | [with synonyms] | w | other taxonomic work | 61-66, Abb. 16 |
| Macrostomidae Macrostomum Schmidt, 1848 | [with synonyms] | w | other taxonomic work | 66-67 |
| Dolichomacrostominae Dolichomacrostomum Luther, 1947 | | w | other taxonomic work | 89 |
| Prolecithophora Combinata Karling, 1940 | | w | other taxonomic work | 99 |
| Protomonotresinae Archimonotresis Meixner, 1938 | [with synonyms] | w | other taxonomic work | 99 |
| Prolecithophora Separata Reisinger, 1924 | | w | other taxonomic work | 101 |
| Macrostomum appendiculatum (1) finnlandensis Ferguson, 1940 | | w | latest taxonomic authority | 72 |
