| Olisthanella septentrionalis Nasonov, 1924 | | w | primary taxonomic authority (describer) | 334 |
| Stenostomidae Stenostomum leucops (Duges, 1828) | [with synonyms] | w | other taxonomic work | 302 |
| Stenostomidae Stenostomum grande Child, 1902 | [with synonyms] | w | other taxonomic work | 330 |
| Stenostomidae Stenostomum unicolor Schmidt, 1848 | [with synonyms] | w | other taxonomic work | 330 |
| Stenostomidae Rhynchoscolex simplex Leidy, 1851 | [with synonyms] | w | other taxonomic work | 330 |
| Microstomidae Microstomum lineare (Müller OF, 1773) | [with synonyms] | w | other taxonomic work | 331 |
| Macrostomum appendiculatum Fabricius, 1826 | [with synonyms] | w | other taxonomic work | 331 |
| Dalyelliidae Dalyellia ornata Hofsten N, 1907 | | w | other taxonomic work | 332 |
| Dalyellia infundibuliformis (Fuhrmann, 1894) | | w | other taxonomic work | 331 |
| Dalyelliidae Dalyellia armigera Schmidt, 1861 | | w | other taxonomic work | 332 |
| Castrella truncata (Abildgaard1789) | [with synonyms] | w | other taxonomic work | 332 |
| Opistomum tundrae Nasonov, 1923 | | w | other taxonomic work | 336 |
| Olisthanella arctica Nasonov, 1923 | | w | other taxonomic work | 334 |
| Typhloplaninae Strongylostoma radiata (OF Müller, 1774) | [with synonyms] | w | other taxonomic work | 334 |
| Typhloplaninae Strongylostoma elongatum Hofsten N, 1907 | | w | other taxonomic work | 334 |
| Rhynchomesostoma rostratum (Müller OF, 1773) | [with synonyms] | w | other taxonomic work | 334 |
| Typhloplaninae Typhloplana viridata (Abildgaard, 1789) | [with synonyms] | w | other taxonomic work | 334 |
| Castrada instructa Hofsten N, 1907 | | w | other taxonomic work | 335 |
| Castrada Castrada stagnorum Luther, 1904 | [with synonyms] | w | other taxonomic work | 335 |
| Castrada hofmanni Braun, 1885 | | w | other taxonomic work | 335 |
| Castrada sphagnetorum Luther, 1904 | | w | other taxonomic work | 335 |
| Castrada viridis Volz, 1898 | [with synonyms] | w | other taxonomic work | 335 |
| Castrada intermedia (Volz, 1898) | [with synonyms] | w | other taxonomic work | 335 |
| Castrada armata (Fuhrmann, 1894) | [with synonyms] | w | other taxonomic work | 335 |
| Castrada neocomensis Volz, 1898 | | w | other taxonomic work | 335 |
| Castrada Castrada luteola Hofsten N, 1907 | | w | other taxonomic work | 335 |
| Castrada libidinosa Hofsten, 1916 | | w | other taxonomic work | 335 |
| Mesostominae Mesostoma lingua (Abildgaard, 1789) | [with synonyms] | w | other taxonomic work | 335 |
| Mesostoma murmanicum Nasonov, 1923 | | w | other taxonomic work | 335 |
| Polycystis goettei Bresslau, 1906 | | w | other taxonomic work | 336 |
| Gyratrix hermaphroditus hermaphroditus Ehrenberg, 1831 | | w | other taxonomic work | 336 |
| Prorhynchidae Prorhynchus stagnalis Schultze, 1851 | [with synonyms] | w | other taxonomic work | 331 |
| Geocentrophora baltica (Kennel, 1883) | [with synonyms] | w | other taxonomic work | 331 |
| Geocentrophora sphyrocephala de Man, 1876 | [with synonyms] | w | other taxonomic work | 331 |
| Typhloplanella septentrionalis (Nasonov, 1925) | [with synonyms] | w | other taxonomic work | 334, 337 |
| Gieysztoria rubra caucasica (Nasonov, 1919) | [with synonyms] | w | other taxonomic work | 331, 348 |
| Gieysztoria taurica (Nasonov, 1923) | [with synonyms] | w | other taxonomic work | 331, 348 |
| Castrella vernalis Beklemischev, 1921 | | w | other taxonomic work | |
| Krumbachia opisthoformis (Nasonov, 1924) | | w | other taxonomic work | 334, 340 |
