Adoncholaimus derjugini (Ssaweljev, 1912) (additional source)
Anoplostoma viviparum (Bastian, 1865) Bütschli, 1874 (additional source)
Anticoma longicaudata Kreis, 1928 (additional source)
Araeolaimus elegans de Man, 1888 (additional source)
Araeolaimus macrocirculus Kreis, 1928 (additional source)
Axonolaimus spinosus (Bütschli, 1874) de Man, 1889 (additional source)
Bathylaimus inermis (Ditlevsen, 1918) De Man, 1922 (additional source)
Bathylaimus septentrionalis (Filipjev, 1927) De Coninck & Stekhoven, 1933 (additional source)
Camacolaimus tardus de Man, 1889 accepted as Deontolaimus tardus (de Man, 1889) Holovachov & Boström, 2015 (additional source)
Chaetonema longisetum (Steiner, 1916) Filipjev, 1927 (additional source)
Cylicolaimus obtusidens Ditlevsen, 1926 (additional source)
Deontostoma arcticum (Ssaweljev, 1912) Filipjev, 1916 (additional source)
Dichromadora cephalata (Steiner, 1916) Kreis, 1929 (additional source)
Ditlevsenella murmanica Filipjev, 1927 (additional source)
Dolicholaimus marioni De Man, 1888 (additional source)
Draconema cephalatum (Cobb, 1913) Steiner, 1921 (additional source)
Enchelidiella pellucida Allgén, 1954 (additional source)
Enoplolaimus halophilus Ditlevsen, 1928 (additional source)
Enoplolaimus vulgaris de Man, 1893 (additional source)
Enoplus alatus Ssaweljev, 1912 (ecology source)
Enoplus communis Bastian, 1865 (additional source)
Enoplus crassus Filipjev, 1916 (additional source)
Fenestrolaimus murmanicus Filipjev, 1927 (additional source)
Fenestrolaimus profundis Filipjev, 1927 (additional source)
Filipjevia macrolabiata Kreis, 1928 (additional source)
Fusonema multilabiatum Kreis, 1928 (additional source)
Halalaimus diplocephalus Filipjev, 1927 (additional source)
Halalaimus isaitshikovi (Filipjev, 1927) Schuurmans Stekhoven, 1935 (additional source)
Halichoanolaimus robustus (Bastian, 1865) de Man, 1886 (additional source)
Klugea pigmentata (Ditlevsen, 1926) Filipjev, 1927 (additional source)
Ledovitia hirsuta Filipjev, 1927 (additional source)
Leptosomatides steineri Filipjev, 1922 accepted as Leptosomatides arcticus (Filipjev, 1916) (additional source)
Leptosomatum arcticum Filipjev, 1916 accepted as Leptosomatides arcticus (Filipjev, 1916) (additional source)
Leptosomatum elongatum Bastian, 1865 accepted as Leptosomatum gracile Bastian, 1865 (additional source)
Leptosomatum gracile Bastian, 1865 (additional source)
Leptosomatum tetrophthalmum Ssaveljev, 1912 accepted as Leptosomatides arcticus (Filipjev, 1916) (additional source)
Leptosomella acrocerca Filipjev, 1927 (additional source)
Metachromadora vivipara (de Man, 1907) Allgen, 1928 accepted as Chromadoropsis vivipara (de Man, 1907) Allgen, 1928 (additional source)
Metalinhomoeus typicus de Man, 1907 (additional source)
Monoposthia arctica Allgén, 1954 (additional source)
Monoposthia costata (Bastian, 1865) de Man, 1889 (additional source)
Nemanema rotundicaudatum (Ditlevsen, 1926) Filipjev, 1946 (additional source)
Neochromadora craspedota (Steiner, 1916) Micoletzky, 1924 (additional source)
Neochromadora poecilosoma (de Man, 1893) Micoletzky, 1924 (additional source)
Odontophora longisetosa (Allgén, 1928) (additional source)
Oncholaimus brachycercus de Man, 1889 (additional source)
Oncholaimus curvicauda Allgén, 1957 (original description)
Oxyonchus dentatus (Ditlevsen, 1918) Filipjev, 1927 (additional source)
Paracanthonchus bipapillatus Kreis, 1928 (additional source)
Paracanthonchus elongatus (de Man, 1907) Micoletzky, 1924 (additional source)
Paracanthonchus macrodon (Ditlevsen, 1918) Micoletzky, 1924 (additional source)
Paralinhomoeus lepturus de Man, 1907 (additional source)
Parasphaerolaimus paradoxus Ditlevsen, 1918 (additional source)
Pelagonema tenue Kreis, 1928 (additional source)
Phanoderma campbelli Allgén, 1927 accepted as Metaphanoderma campbelli (Allgen, 1927) Platonova, 1984 (additional source)
Phanoderma conicaudatum (Steiner, 1916) Steiner, 1921 accepted as Metaphanoderma conicaudatum (Steiner, 1916) Platonova, 1984 (additional source)
Phanoderma islandicum Ditlevsen, 1926 (additional source)
Phanoderma parasiticum Ditlevsen, 1926 (additional source)
Platycomopsis cobbii Ditlevsen, 1926 (additional source)
Pontonema ditlevseni (Schuurmans Stekhoven in Kreis, 1934) Cobb & Steiner, 1934 (additional source)
Pontonema papilliferum (Filipjev, 1916) Cobb & Steiner, 1916 (additional source)
Pontonema vulgare (Bastian, 1865) Filipjev, 1916 (additional source)
Pseudocella elegans (Ditlevsen, 1926) Wieser, 1953 (additional source)
Rhabdodemania gracilis (Ditlevsen, 1918) Baylis & Daubney, 1926 (additional source)
Rhabdodemania laticauda (Ditlevsen, 1926) Baylis & Daubney, 1926 (additional source)
Rhabdodemania minor (Southern, 1914) Baylis & Daubney, 1926 (additional source)
Richtersia collaris Steiner, 1916 (additional source)
Sabatieria longicaudata Filipjev, 1922 (additional source)
Saveljevia kolaensis Filipjev, 1927 (additional source)
Sphaerolaimus islandicus Ditlevsen, 1926 accepted as Parasphaerolaimus islandicus (Ditlevsen, 1926) Filipjev, 1946 (additional source)
Synonchus fasciculatus Cobb, 1893 (additional source)
Synonchus murmanicus Filipjev, 1927 (additional source)
Thalassoalaimus egregius Steiner, 1916 accepted as Litinium egregius (Steiner, 1916) Martelli, Lo Russo, Villares & Pastor de Ward, 2017 (additional source)
Thalassoalaimus septentrionalis Filipjev, 1927 (additional source)
Theristus acer Bastian, 1865 (additional source)
Thoracostoma multipapillosum Allgén, 1957 (original description)
Thoracostomopsis ditlevseni Filipjev, 1927 accepted as Metaphanoderma ditlevseni (Filipjev, 1927) Platonova, 1984 (additional source)
Tripyloides marinus (Bütschli, 1874) de Man, 1886 (additional source)
Vasculonema conicaudatum Kreis, 1928 (additional source)
Viscosia langrunensis (de Man, 1890) (additional source)
Viscosia stenolaima Filipjev, 1927 (additional source)
Viscosia viscosa (Bastian, 1865) de Man, 1890 (additional source)