Adoncholaimus lepidus (de Man, 1889) Filipjev, 1918 (additional source)
Aegialoalaimus elegans de Man, 1907 (additional source)
Anoplostoma viviparum (Bastian, 1865) Bütschli, 1874 (additional source)
Anticoma acuminata (Eberth, 1863) Bastian, 1865 (taxonomy source)
Anticoma eberthi Bastian, 1865 (additional source)
Anticoma pellucida Bastian, 1865 accepted as Anticoma limalis novozemelica Filipjev, 1927 accepted as Anticoma acuminata (Eberth, 1863) Bastian, 1865 (additional source)
Araeolaimus elegans de Man, 1888 (additional source)
Ascolaimus elongatus (Bütschli, 1874) Shuurmans Stekhoven & de Coninck, 1932 (additional source)
Atrochromadora microlaima (de Man, 1889) Wieser, 1954 (additional source)
Axonolaimus paraspinosus Schuurmans Stekhoven & Adam, 1931 (additional source)
Axonolaimus spinosus (Bütschli, 1874) de Man, 1889 (additional source)
Bathylaimus inermis (Ditlevsen, 1918) De Man, 1922 (additional source)
Camacolaimus tardus de Man, 1889 accepted as Deontolaimus tardus (de Man, 1889) Holovachov & Boström, 2015 (additional source)
Chromadora macrolaima de Man, 1889 (additional source)
Chromadorita abnormis (Kreis, 1928) Wieser, 1954 (additional source)
Chromadorita heterophya (Steiner, 1916) Filipjev, 1922 (additional source)
Chromadorita mucrodonta (Steiner, 1916) Wieser, 1954 (additional source)
Chromadorita pachydema (G. Schneider, 1926) Wieser, 1954 (additional source)
Chromadorita tenuis (G. Schneider, 1906) Filipjev, 1922 (additional source)
Daptonema furcatum (Juario, 1974) Lorenzen, 1977 (additional source)
Daptonema hirsutum (Vitiello, 1967) Lorenzen, 1977 (additional source)
Daptonema procerum (Gerlach, 1951) Lorenzen, 1977 (additional source)
Daptonema setosum (Bütschli, 1874) Lorenzen, 1977 (additional source)
Deontostoma arcticum (Ssaweljev, 1912) Filipjev, 1916 (additional source)
Desmodora communis (Bütschli, 1874) De Man, 1889 (additional source)
Desmolaimus de Man, 1880 (additional source)
Desmolaimus zeelandicus de Man, 1880 (additional source)
Dichromadora Kreis, 1929 (additional source)
Dichromadora cephalata (Steiner, 1916) Kreis, 1929 (additional source)
Dichromadora cucullata Lorenzen, 1973 (additional source)
Dichromadora geophila (de Man, 1876) Kreis, 1929 (additional source)
Dichromadora hyalocheile De Coninck & Schuurmans Stekhoven, 1933 (additional source)
Diplopeltis cirrhatus (Eberth, 1863) Cobb, 1891 (additional source)
Ditlevsenella murmanica Filipjev, 1927 (additional source)
Enoploides cephalophorus (Ditlevsen, 1918) Filipjev, 1927 (additional source)
Enoplolaimus vulgaris de Man, 1893 (additional source)
Enoplus brevis Bastian, 1865 (additional source)
Enoplus communis Bastian, 1865 (taxonomy source)
Ethmolaimidae Filipjev & Schuurmans Stekhoven, 1941 (additional source)
Eurystomina assimilis (de Man, 1876) de Man, 1888 (additional source)
Eurystomina littoralis Allgen, 1929 (additional source)
Gammanema rapax (Ssaweljev, 1912) Gerlach, 1964 (additional source)
Gerlachius lissus (Gerlach, 1956) (additional source)
Halalaimus isaitshikovi (Filipjev, 1927) Schuurmans Stekhoven, 1935 (additional source)
Halalaimus longicaudatus (Filipjev, 1927) Schneider, 1939 (additional source)
Halanonchus zosterae (Allgén, 1933) Gerlach, 1964 (additional source)
Halichoanolaimus dolichurus Ssaweljev, 1912 (additional source)
Halichoanolaimus robustus (Bastian, 1865) de Man, 1886 (additional source)
Hypodontolaimus balticus (G. Schneider, 1906) Filipjev, 1918 (additional source)
Hypodontolaimus inaequalis (Bastian, 1865) De Man, 1886 (additional source)
Hypodontolaimus setosus (Bütschli, 1874) Wieser, 1954 (additional source)
Krampia acropora Ditlevsen, 1921 (additional source)
Leptolaimus ditlevseni (Steiner, 1916) De Coninck, 1965 (additional source)
Leptosomatum elongatum Bastian, 1865 accepted as Leptosomatum gracile Bastian, 1865 (additional source)
Linhomoeus elongatus Bastian, 1865 (additional source)
Mesacanthion Filipjev, 1927 (taxonomy source)
Metachromadora vivipara (de Man, 1907) Allgen, 1928 accepted as Chromadoropsis vivipara (de Man, 1907) Allgen, 1928 (additional source)
Meyliidae De Coninck, 1965 (additional source)
Monhystera Bastian, 1865 (taxonomy source)
Monoposthia mielcki Steiner, 1916 (additional source)
Neochromadora Micoletzky, 1924 (additional source)
Neochromadora craspedota (Steiner, 1916) Micoletzky, 1924 (additional source)
Neochromadora poecilosoma (de Man, 1893) Micoletzky, 1924 (additional source)
Odontophora setosa (Allgén, 1929) (additional source)
Odontophora villoti Luc & De Coninck, 1959 (additional source)
Oncholaimus brachycercus de Man, 1889 (additional source)
Oncholaimus dujardinii de Man, 1876 (additional source)
Oncholaimus oxyuris Ditlevsen, 1911 (additional source)
Oxyonchus dentatus (Ditlevsen, 1918) Filipjev, 1927 (additional source)
Oxystomina elongata (Bütschli, 1874) Filipjev, 1921 (additional source)
Paracanthonchus caecus (Bastian, 1865) Micoletzky, 1924 (additional source)
Paracanthonchus elongatus (de Man, 1907) Micoletzky, 1924 (additional source)
Paracanthonchus heterodontus (Schulz, 1932) Vincx et al., 1982 (additional source)
Paracanthonchus longicaudatus Warwick, 1971 (ecology source)
Paracanthonchus macrodon (Ditlevsen, 1918) Micoletzky, 1924 (additional source)
Paralinhomoeus lepturus de Man, 1907 (additional source)
Paramonohystera megacephala Steiner, 1916 (additional source)
Pontonema vulgare (Bastian, 1865) Filipjev, 1916 (additional source)
Prochromadorella ditlevseni (de Man, 1922) Wieser, 1954 (additional source)
Pseudocella trichodes (Leuckart, 1849) Filipjev, 1927 (additional source)
Pseudolella norvegica Allgén, 1947 (additional source)
Rhabdodemania minor (Southern, 1914) Baylis & Daubney, 1926 (additional source)
Rhynchonema lyngei (Allgén, 1940) Gerlach, 1953 (additional source)
Richtersia collaris Steiner, 1916 (additional source)
Sabatieria celtica Southern, 1914 (additional source)
Sabatieria cupida Bresslau & Schuurmans Stekhoven, 1940 accepted as Sabatieria celtica Southern, 1914 (taxonomy source)
Sabatieria kolaensis (Ssaweljev, 1912) Filipjev, 1922 (additional source)
Sabatieria ornata (Ditlevsen, 1918) Filipjev, 1922 (taxonomy source)
Sabatieria pulchra (Schneider, 1906) Riemann, 1970 (taxonomy source)
Siphonolaimus ewensis Warwick & Platt, 1973 (additional source)
Sphaerolaimus balticus Schneider, 1906 (additional source)
Sphaerolaimus gracilis de Man, 1876 (additional source)
Sphaerolaimus hirsutus Bastian, 1865 (additional source)
Sphaerolaimus makrolasius Schulz, 1932 (additional source)
Spilophorella candida Gerlach, 1951 (additional source)
Spirinia laevis (Bastian, 1865) Gerlach, 1963 (additional source)
Spirinia parasitifera (Bastian, 1865) Gerlach, 1963 (additional source)
Symplocostoma tenuicolle (Eberth, 1863) Wieser, 1953 (additional source)
Terschellingia communis de Man, 1888 (additional source)
Terschellingia distalamphida Juario, 1974 (additional source)