| Peraclistus oophagus (Friedmann, 1924) | [with synonyms] | w | other taxonomic work | 329 |
| Childia groenlandica borealis Steinböck, 1932 | | w | primary taxonomic authority (describer) | |
| Amphiscolops virescens (Örsted AS, 1845) | | w | other taxonomic work | 300 |
| Aphanostoma armatum Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 299 |
| Aphanostoma bimaculata Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 299 |
| Convoluta bathycola Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 300 |
| Convoluta saliens solowetzkiana Sabussow, 1897 | | w | other taxonomic work | 302 |
| Proaphanostoma variabile Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 298 |
| Plagiostomidae Allopharynx Steinböck, 1932 | | w | primary taxonomic authority (describer) | |
| Plagiostomidae Alloeopharynx Steinböck, 1932 | | w | primary taxonomic authority (describer) | |
| Alloeopharynx makropharynx Steinböck, 1932 | | w | primary taxonomic authority (describer) | |
| Castrada groenlandica Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 315 |
| Castrada jenseni Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 318 |
| Castrada longibursa Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 318 |
| Castrada stagnorum angustibursa Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 316 |
| Peraclistus bathycolus Fügenschuh (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 329 |
| Peraclistus prostenopharynx Fügenschuh (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 329 |
| Monocelis honorei Fügenschuh (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 328 |
| Promonotus brevirostris Fügenschuh (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 329 |
| Promonotus groenlandicus Fügenschuh (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 329 |
| Promonotus longirostris Fügenschuh (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 329 |
| Orthoplana porsildi Kohler (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 330-331 |
| Coleophora chionoecetis Fügenschuh (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 328 |
| Coleophora levinseni Fügenschuh (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 328-329 |
| Diporoplana cnidophora Kohler (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 330 |
| Diporoplana fulgipenis Kohler (Steinbock, 1932) | | w | primary taxonomic authority (describer) | 330 |
| Lamelliposthia rubropunctata Steinbock, 1932 | | w | primary taxonomic authority (describer) | 301 |
| Lamelliposthia rubromaculata Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 301 |
| Polysolenoposthia bathycola Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 300 |
| Polysolenoposthia porsildi Steinböck & Lanser, 1932 | | w | primary taxonomic authority (describer) | 300 |
| Polycystis groenlandica Levinsen, 1879 | | w | other taxonomic work | 320 |
| Convoluta chiridotae (Beklemischev, 1915) | [with synonyms] | w | other taxonomic work | |
| Mecynostomidae Childia groenlandica (Levinsen, 1879) | [with synonyms] | w | other research on this sp. | 298 |
| Otocelis chiridotae Beklemischev, 1915 | | w | other research on this sp. | 298 |
| Aphanostoma pallidum Beklemischev, 1915 | | w | other research on this sp. | 299 |
| Pseudactinoposthia sanguineum (Beklemischev, 1915) | [with synonyms] | w | other research on this sp. | 299 |
| Convoluta convoluta (Abildgaard, 1806) | [with synonyms] | w | other research on this sp. | 299 |
| Convoluta borealis Sabussow, 1900 | [with synonyms] | w | other research on this sp. | 300 |
| Tetraposthia colymbetes Steinböck, 1931 | | w | other research on this sp. | 300 |
| Aphanostoma latissimum Levinsen, 1879 | | w | other research on this sp. | 301 |
| Aphanostoma diversicolor Ørsted, 1845 | | w | other taxonomic work | 301 |
| Mecynostomum cordiforme Levinsen, 1879 | | w | other taxonomic work | 301 |
| Mecynostomum lentiferum Levinsen, 1879 | | w | other taxonomic work | 301 |
| Stenostomidae Stenostomum leucops (Duges, 1828) | [with synonyms] | w | other taxonomic work | 302 |
| Stenostomidae Stenostomum grande Child, 1902 | [with synonyms] | w | other taxonomic work | 302 |
| Stenostomidae Rhynchoscolex simplex Leidy, 1851 | [with synonyms] | w | other taxonomic work | 302 |
| Alaurina composita Metschnikoff, 1861 | | w | other taxonomic work | 303 |
| Microstomidae Microstomum lineare (Müller OF, 1773) | [with synonyms] | w | other taxonomic work | 303 |
| Microstomum groenlandicum Levinsen, 1879 | | w | other taxonomic work | 303 |
| Microstomum septentrionale Sabussow, 1900 | | w | other taxonomic work | 303 |
| Microstomum mortenseni Riedel, 1932 | | w | other taxonomic work | 303 |
| Microstomum dermophthalmum Riedel, 1932 | | w | other taxonomic work | 303 |
| Microstomum jenseni Riedel, 1932 | [with synonyms] | w | other taxonomic work | 304 |
| Macrostomum appendiculatum Fabricius, 1826 | [with synonyms] | w | other taxonomic work | 304 |
| Macrostomum boreale Riedel, 1932 | [with synonyms] | w | other taxonomic work | 304 |
| Macrostomum thermophilum Riedel, 1932 | | w | other taxonomic work | 304 |
| Paramacrostomum tricladoides Riedel, 1932 | | w | other taxonomic work | 304 |
| Oekiocolax plagiostomorum Reisinger, 1929 | | w | other taxonomic work | 304 |
| Haplovortex brevitubus (Luther, 1918) | | w | other taxonomic work | 305 |
| Provortex balticus (Schultze, 1851) | [with synonyms] | w | other taxonomic work | 305 |
| Provortex affinis (Jensen, 1878) | [with synonyms] | w | other taxonomic work | 305 |
| Graffilla buccinicola Jameson, 1897 | | w | other taxonomic work | 305 |
| Anoplodium mytili Levinsen, 1879 | | w | other taxonomic work | 305 |
| Anoplodium chirodotae Sabussow, 1900 | | w | other taxonomic work | 306 |
| Desmote vorax Beklemischev, 1916 | | w | other taxonomic work | 306 |
| Syndesmis echinorum Francois, 1886 | [with synonyms] | w | other taxonomic work | 306 |
| Collastoma eremitae Beklemischev, 1916 | | w | other taxonomic work | 306 |
| Pterastericola fedotovi Beklemischev, 1916 | | w | other taxonomic work | 306 |
| Dalyelliidae Dalyellia ornata Hofsten N, 1907 | | w | other taxonomic work | 306 |
| Dalyelliidae Dalyellia cuspidata (Schmidt, 1861) | | w | other taxonomic work | 306-307 |
| Dalyellia infundibuliformis (Fuhrmann, 1894) | | w | other taxonomic work | 307 |
| Dalyellia dodgei Graff, 1911 | | w | other taxonomic work | 307 |
| Dalyelliidae Dalyellia rossi Graff, 1911 | | w | other taxonomic work | 307 |
| Dalyelliidae Dalyellia armigera Schmidt, 1861 | | w | other taxonomic work | 307 |
| Dalyellia deses Riedel, 1932 | | w | other taxonomic work | 307 |
| Dalyellia coronaria (Schmidt, 1858) | | w | other taxonomic work | 308 |
| Dalyelliidae Dalyellia picta (Schmidt, 1848) | | w | other taxonomic work | 308 |
| Dalyellia minima (2) Riedel, 1932 | | w | other taxonomic work | 308 |
| Dalyellia groenlandica Riedel, 1932 | | w | other taxonomic work | 308 |
| Castrella truncata (Abildgaard1789) | [with synonyms] | w | other taxonomic work | 308 |
| Maehrenthalia agilis (Levinsen, 1879) | [with synonyms] | w | other taxonomic work | 309 |
| Byrsophlebs graffi Jensen, 1878 | | w | other taxonomic work | 310 |
| Paramesostominae Astrotorhynchus bifidus (McIntosh, 1874) | [with synonyms] | w | other taxonomic work | 310 |
| Proxenetes gracilis Graff, 1882 | | w | other taxonomic work | 310 |
| Proxenetes flabellifer Jensen, 1878 | [with synonyms] | w | other taxonomic work | 310 |
| Trigonostominae Proxenetes cochlear (1) Graff, 1882 | | w | other taxonomic work | 311 |
| Promesostominae Promesostoma marmoratum (Schultze, 1851) | [with synonyms] | w | other taxonomic work | 311 |
| Promesostoma marmoratum marmoratum (Schultze, 1851) | [with synonyms] | w | other taxonomic work | 311 |
| Promesostoma marmoratum groenlandicum (Levinsen, 1879) | | w | other taxonomic work | 311 |
| Promesostominae Promesostoma ovoideum (Schmidt, 1852) | [with synonyms] | w | other taxonomic work | 311 |
| Promesostoma ovoideum ovoideum Graff, 1905 | | w | other taxonomic work | 311 |
| Promesostoma ovoideum purum Graff, 1905 | | w | other research on this sp. | 312 |
| Promesostoma agile (Levinsen, 1879) | | w | other taxonomic work | 312 |
| Promesostoma lenticulatum (Schmidt, 1852) | | w | other taxonomic work | 312 |
| Promesostoma murmanica Graff, 1905 | | w | other taxonomic work | 312 |
| Acrochordonoposthia conica Reisinger, 1924 | | w | other taxonomic work | 312 |
| Opistomum tundrae Nasonov, 1923 | | w | other taxonomic work | 313 |
| Olisthanella arctica Nasonov, 1923 | | w | other taxonomic work | 313 |
| Typhloplaninae Strongylostoma radiata (OF Müller, 1774) | [with synonyms] | w | other taxonomic work | 313 |
| Typhloplaninae Strongylostoma elongatum Hofsten N, 1907 | | w | other taxonomic work | 313 |
| Rhynchomesostoma rostratum (Müller OF, 1773) | [with synonyms] | w | other taxonomic work | 313 |
| Typhloplaninae Typhloplana viridata (Abildgaard, 1789) | [with synonyms] | w | other taxonomic work | 314 |
| Typhloplanella halleziana (Vejdovsky, 1880) | [with synonyms] | w | other taxonomic work | 314 |
| Styloplanella strongylostomoides Findenegg, 1924 | | w | other taxonomic work | 314 |
| Castrada fuhrmanni (Volz, 1898) | | w | other taxonomic work | 315 |
| Castrada inermis Hofsten N, 1911 | | w | other taxonomic work | 315 |
| Castrada instructa Hofsten N, 1907 | | w | other taxonomic work | 315 |
| Castrada Castrada borealis Steinböck, 1931 | | w | other taxonomic work | 315 |
| Castrada perspicua (Fuhrmann, 1894) | [with synonyms] | w | other taxonomic work | 315 |
| Castrada Castrada stagnorum Luther, 1904 | [with synonyms] | w | other taxonomic work | 316 |
| Castrada lanceola (Braun, 1885) | [with synonyms] | w | other taxonomic work | 316 |
| Castrada hofmanni Braun, 1885 | | w | other taxonomic work | 316 |
| Castrada spinulosa Hofsten N, 1907 | | w | other taxonomic work | 316 |
| Castrada sphagnetorum Luther, 1904 | | w | other taxonomic work | 317 |
| Castrada viridis Volz, 1898 | [with synonyms] | w | other taxonomic work | 317 |
| Castrada intermedia (Volz, 1898) | [with synonyms] | w | other taxonomic work | 317 |
| Castrada armata (Fuhrmann, 1894) | [with synonyms] | w | other taxonomic work | 317 |
| Castrada neocomensis Volz, 1898 | | w | other taxonomic work | 317 |
| Castrada Castrada luteola Hofsten N, 1907 | | w | other taxonomic work | 318 |
| Mesostominae Mesostoma productum (Schmidt, 1848) | [with synonyms] | w | other taxonomic work | 318 |
| Mesostominae Mesostoma productum (Schmidt, 1848) | [with synonyms] | w | other taxonomic work | 318 |
| Mesostominae Mesostoma lingua (Abildgaard, 1789) | [with synonyms] | w | other taxonomic work | 318-319 |
| Mesostoma craci Schmidt, 1858 | [with synonyms] | w | other taxonomic work | 319 |
| Mesostoma maculatum Hofsten N, 1916 | | w | other taxonomic work | 319 |
| Mesostoma platygastricum Hofsten N, 1924 | [with synonyms] | w | other taxonomic work | 319 |
| Mesostoma murmanicum Nasonov, 1923 | | w | other taxonomic work | 319-320 |
| Bothromesostoma personatum (Schmidt, 1848) | [with synonyms] | w | other taxonomic work | 320 |
| Polycystis crocea (Fabricius, 1826) | | w | other taxonomic work | 320 |
| Bothromesostoma essenii Braun, 1885 | [with synonyms] | w | other taxonomic work | 320 |
| Polycystis assimilis (Levinsen, 1879) | | w | other taxonomic work | 321 |
| Polycystis goettei Bresslau, 1906 | | w | other taxonomic work | 321 |
| Acrorhynchus caledonicus (Claperede, 1861) | | w | other taxonomic work | 321 |
| Polycystidinae Phonorhynchus helgolandicus (Metschnikow, 1865) | [with synonyms] | w | other taxonomic work | 321 |
| Gyratrix hermaphroditus hermaphroditus Ehrenberg, 1831 | | w | other taxonomic work | 321 |
| Provortex punctatus (Levinsen, 1879) | | w | other taxonomic work | 322 |
| Provortex hispidus Graff, 1882 | [with synonyms] | w | other taxonomic work | 322 |
| Promesostoma graffi Mereschkowsky, 1878 | [with synonyms] | w | other taxonomic work | 322 |
| Prorhynchidae Prorhynchus stagnalis Schultze, 1851 | [with synonyms] | w | other taxonomic work | 323 |
| Geocentrophora baltica (Kennel, 1883) | [with synonyms] | w | other taxonomic work | 323 |
| Geocentrophora sphyrocephala de Man, 1876 | [with synonyms] | w | other taxonomic work | 323 |
| Plagiostomidae Plagiostomum girardi (Schmidt, 1857) | [with synonyms] | w | other taxonomic work | 323 |
| Plagiostomum caudatum Levinsen, 1879 | [with synonyms] | w | other taxonomic work | 323 |
| Plagiostomum vittatum (Frey & Leuckart, 1847) | [with synonyms] | w | other taxonomic work | 324 |
| Plagiostomum makropharynx Brandtner, 1934 | | w | other taxonomic work | 324 |
| Plagiostomum anocelis Brandtner, 1934 | | w | other taxonomic work | 324 |
| Plagiostomum makroposthia Brandtner, 1934 | | w | other taxonomic work | 324 |
| Plagiostomum petrophilum Brandtner, 1934 | | w | other taxonomic work | 324 |
| Plagiostomum chinoecetis Brandtner, 1934 | [with synonyms] | w | other taxonomic work | 324 |
| Plagiostomum arcticum Brandtner, 1934 | | w | other taxonomic work | 324-325 |
| Urastoma cyprinae (Graff, 1882) | [with synonyms] | w | other taxonomic work | 326 |
| Graffia capitata Levinsen, 1879 | | w | other taxonomic work | 326 |
| Cylindrostoma fingalianum (Claperede, 1861) | [with synonyms] | w | other taxonomic work | 326 |
| Enterostomum flavibacillum Jensen, 1878 | | w | other taxonomic work | 326 |
| Allostoma album (Levinsen, 1879) | | w | other taxonomic work | 326 |
| Allostoma discors (Levinsen, 1879) | | w | other taxonomic work | 327 |
| Allostoma oerstedi (Levinsen, 1879) | [with synonyms] | w | other taxonomic work | 327 |
| Acmostomum groenlandicum Levinsen, 1879 | | w | other taxonomic work | 327 |
| Monocelis fusca Örsted, 1843 | [with synonyms] | w | other taxonomic work | 327 |
| Monocelis lineata (Müller OF, 1773) | [with synonyms] | w | other taxonomic work | 327 |
| Coleophora hirudo (Levinsen, 1879) | | w | other taxonomic work | 328 |
| Coleophora alba (Levinsen, 1879) | | w | other taxonomic work | 328 |
| Otomesostoma auditivum (Du Plessis, 1874) | [with synonyms] | w | other taxonomic work | 330 |
| Coelogynopora biarmata Steinböck, 1924 | [with synonyms] | w | other taxonomic work | 330 |
| Orthoplana borealis (Steinböck, 1931) | [with synonyms] | w | other taxonomic work | 330 |
| Bothrioplana semperi Braun, 1881 | [with synonyms] | w | other taxonomic work | 331 |
| Procerodes lobatus solowetzkianus (Sabussow) Steinbock, 1931 | | w | other taxonomic work | 331 |
| Procerodes ulvae (Ørsted, 1843) | | w | other taxonomic work | 331 |
| Foviella affinis (Ørsted, 1843) | [with synonyms] | w | other taxonomic work | 331 |
| Uteriporus vulgaris Bergendal, 1890 | [with synonyms] | w | other taxonomic work | 332 |
| Planariidae Planaria alpina (Dana, 1766) | | w | other taxonomic work | 332 |
| Dendrocoelidae Dendrocoelum lactea (Müller OF, 1773) | [with synonyms] | w | other taxonomic work | 332 |
| Plehnia arctica (Plehn, 1896) | | - | other taxonomic work | 322 |
| Discocelides langi Bergendal, 1893 | | - | other taxonomic work | 333 |
| Notoplana kuekenthali (Plehn, 1896) | [with synonyms] | w | other taxonomic work | 333 |
| Notoplana kuekenthali Plehn, 1896 | | - | other taxonomic work | 333 |
| Polyporus caecus Plehn, 1897 | | - | other taxonomic work | 334 |
| Stylostomum ellipse (Dalyell, 1853) | | - | other taxonomic work | 334 |
| Mecynostomidae Childia groenlandica (Levinsen, 1879) | [with synonyms] | w | other taxonomic work | 298 |
| Baicalellia brevituba (Luther, 1918) | [with synonyms] | w | other taxonomic work | 305 |
| Gieysztoria minima (Riedel, 1932) | [with synonyms] | w | other taxonomic work | 308 |
| Nemertoderma bathycola Steinböck, 1930 | | w | other taxonomic work | 297 |
| Otocelis maris-alba (Sabussow, 1899) | | w | other taxonomic work | 298 |
| Aphanostoma rhomboides Jensen, 1878 | [with synonyms] | w | other taxonomic work | 298 |
| Aphanostoma sanguineum Beklemischev, 1915 | | w | latest taxonomic authority | 299 |
| Aechmalotus pyrula Beklemischev, 1915 | [with synonyms] | w | other taxonomic work | 299 |
| Convoluta flavibacillum Jensen, 1878 | | w | other taxonomic work | 299 |
| Childiidae Tetraposthia Steinböck, 1931 | | w | other taxonomic work | 300 |
| Gieysztoria cuspidata (Schmidt, 1861) | [with synonyms] | w | other research on this sp. | |
| Pontaralia spinosa (Beklemischev, 1927) | | w | other taxonomic work | |
