| Dalyellia arctica Nasonov, 1923 | | w | latest taxonomic authority | |
| Dalyellia mollosovi Nasonov, 1920 | | w | latest taxonomic authority | |
| Provortex sphagnorum (Sekera, 1912) | | w | latest taxonomic authority | |
| Dalyellia bicornis Nasonov, 1925 | | w | primary taxonomic authority (describer) | |
| Dalyellia brevispina marituica Nasonov, 1926 | | w | primary taxonomic authority (describer) | |
| Dalyellia oligochaeta karisalmica Nasonov, 1926 | | w | primary taxonomic authority (describer) | |
| Microdalyellia bicornis (Nasonov, 1926) | [with synonyms] | w | primary taxonomic authority (describer) | |
| Olisthanella truncula lucida Nasonov, 1926 | | w | primary taxonomic authority (describer) | |
| Typhloplanella arctica (Nasonov, 1923) | [with synonyms] | w | other taxonomic work | 68 |
| Typhloplanella septentrionalis (Nasonov, 1925) | [with synonyms] | w | primary taxonomic authority (describer) | 56, 59, 68-69, f. 8 |
| Macrostomum obtusum korsakovi Nasonov, 1926 | | w | primary taxonomic authority (describer) | |
| Stenostomum leucops (Duges, 1828) | [with synonyms] | w | other taxonomic work | 59 |
| Stenostomum grande Child, 1902 | [with synonyms] | w | other taxonomic work | 59 |
| Stenostomum unicolor Schmidt, 1848 | [with synonyms] | w | other taxonomic work | 59 |
| Rhynchoscolex simplex Leidy, 1852 | [with synonyms] | w | other taxonomic work | 60 |
| Macrostomum appendiculatum Fabricius, 1826 | [with synonyms] | w | other taxonomic work | 60 |
| Dalyellia ornata Hofsten N, 1907 | | w | other taxonomic work | 61 |
| Dalyellia infundibuliformis (Fuhrmann, 1894) | | w | other taxonomic work | 61 |
| Dalyellia armigera Schmidt, 1861 | | w | other taxonomic work | 61 |
| Castrella (Castrella) truncata (Abildgaard, 1789) | [with synonyms] | w | other taxonomic work | 64 |
| Olisthanella arctica Nasonov, 1923 | | w | other taxonomic work | 68 |
| Strongylostoma radiatum (Müller, 1774) | [with synonyms] | w | other taxonomic work | 72 |
| Strongylostoma elongatum Hofsten N, 1907 | | w | other taxonomic work | 72 |
| Castrada (Castrada) instructa Hofsten N, 1907 | | w | other taxonomic work | 65 |
| Castrada (Castrada) stagnorum Luther, 1904 | [with synonyms] | w | other taxonomic work | 66 |
| Castrada (Castrada) hofmanni Braun, 1885 | | w | other taxonomic work | 67 |
| Castrada (Castrada) viridis Volz, 1898 | [with synonyms] | w | other taxonomic work | 65 |
| Castrada (Castrada) intermedia (Volz, 1898) | [with synonyms] | w | other taxonomic work | 67 |
| Castrada (Castrada) armata (Fuhrmann, 1894) | [with synonyms] | w | other taxonomic work | 67 |
| Castrada (Castrada) neocomensis Volz, 1898 | | w | other taxonomic work | 66 |
| Castrada (Castrada) luteola Hofsten N, 1907 | | w | other taxonomic work | 66 |
| Castrada (Castrada) libidinosa Hofsten, 1916 | | w | other taxonomic work | 67 |
| Mesostoma lingua (Abildgaard, 1789) | [with synonyms] | w | other taxonomic work | 69 |
| Mesostoma murmanicum Nasonov, 1923 | | w | other taxonomic work | 69 |
| Polycystis goettei Bresslau, 1906 | | w | other taxonomic work | 72 |
| Prorhynchus stagnalis Schultze, 1851 | [with synonyms] | w | other taxonomic work | 60 |
| Geocentrophora baltica (Kennel, 1883) | [with synonyms] | w | other taxonomic work | 60 |
| Strongylostoma elongatum elongatum Hofsten N, 1907 | [with synonyms] | w | other taxonomic work | 56, 72 |
| Gieysztoria cuspidata (Schmidt, 1861) | [with synonyms] | w | other research on this sp. | |
| Olisthanella (Typhloplanella) septentrionalis Nasonov, 1925 | | w | primary taxonomic authority (describer) | |
| Olisthanella (Typhloplanella) arctica Nasonov, 1923 | | - | other taxonomic work | 69 |
