Adoncholaimus fuscus (Bastian, 1865) Filipjev, 1918 (additional source)
Adoncholaimus lepidus (de Man, 1889) Filipjev, 1918 (additional source)
Adoncholaimus thalassophygas (de Man, 1876) Filipjev, 1918 (additional source)
Aegialoalaimus elegans de Man, 1907 (additional source)
Anoplostoma viviparum (Bastian, 1865) Bütschli, 1874 (additional source)
Antomicron elegans (de Man, 1922) De Coninck, 1965 (additional source)
Antomicron pratense Lorenzen, 1966 (additional source)
Ascolaimus elongatus (Bütschli, 1874) Shuurmans Stekhoven & de Coninck, 1932 (additional source)
Axonolaimus paraspinosus Schuurmans Stekhoven & Adam, 1931 (additional source)
Calyptronema maxweberi (de Man, 1922) (additional source)
Camacolaimus tardus de Man, 1889 accepted as Deontolaimus tardus (de Man, 1889) Holovachov & Boström, 2015 (additional source)
Chromadora nudicapitata Bastian, 1865 (additional source)
Chromadorina granulopigmentata (Wieser, 1951) Wieser, 1954 (additional source)
Chromadorina supralitoralis Lorenzen, 1969 (original description)
Chromadorita abnormis (Kreis, 1928) Wieser, 1954 (additional source)
Chromadorita tenuis (G. Schneider, 1906) Filipjev, 1922 (additional source)
Chromaspirina thieryi De Coninck, 1943 (additional source)
Deontolaimus papillatus de Man, 1880 (additional source)
Desmolaimus bulbulus Lorenzen, 1969 (original description)
Desmolaimus zeelandicus de Man, 1880 (additional source)
Desmoscolex vanoyei De Coninck, 1943 (additional source)
Dichromadora cephalata (Steiner, 1916) Kreis, 1929 (additional source)
Dichromadora scandula Lorenzen, 1966 (additional source)
Diplolaimella ocellata (Bütschli, 1874) (additional source)
Diplolaimella stagnosa Lorenzen, 1966 (additional source)
Diplolaimelloides altherri Meyl, 1954 (additional source)
Diplolaimelloides oschei Meyl, 1954 (additional source)
Doliolaimus agilis Lorenzen, 1966 (additional source)
Enoplus brevis Bastian, 1865 (additional source)
Halalaimus gracilis de Man, 1888 (additional source)
Halalaimus terrestris Gerlach, 1959 (additional source)
Halichoanolaimus robustus (Bastian, 1865) de Man, 1886 (additional source)
Haliplectus dorsalis Cobb in Chitwood, 1956 (additional source)
Hypodontolaimus balticus (G. Schneider, 1906) Filipjev, 1918 (additional source)
Leptolaimus acicula Lorenzen, 1966 (additional source)
Leptolaimus elegans (Stekhoven & De Coninck, 1933) Gerlach, 1958 (additional source)
Leptolaimus papilliger de Man, 1876 (additional source)
Metachromadora remanei Gerlach, 1951 accepted as Metachromadoroides remanei (Gerlach, 1951) Timm, 1961 (additional source)
Metalinhomoeus musaecauda Lorenzen, 1966 (additional source)
Microlaimus globiceps de Man, 1880 (additional source)
Microlaimus robustidens Schuurmans Stekhoven & De Coninck, 1933 (additional source)
Monhystera anophthalma Lorenzen, 1969 accepted as Monhystrella anophthalma (Lorenzen, 1969) Jacobs, 1987 (original description)
Monhystera disjuncta Bastian, 1865 accepted as Halomonhystera disjuncta (Bastian, 1865) Andrássy, 2006 (additional source)
Monhystera filiformis Bastian, 1865 accepted as Eumonhystera filiformis (Bastian, 1865) Andrássy, 1981 (additional source)
Monhystera islandica De Coninck, 1943 accepted as Thalassomonhystera islandica (De Coninck, 1943) Jacobs, 1987 accepted as Halomonhystera islandica (De Coninck, 1943) Tchesunov, Portnova & van Campenhout, 2015 (additional source)
Monhystera multisetosa Meyl, 1955 accepted as Eumonhystera multisetosa (Meyl, 1955) Andrássy, 1981 accepted as Thalassomonhystera multisetosa (Meyl, 1955) Jacobs, 1987 (additional source)
Monhystera paramacramphis Meyl, 1954 (additional source)
Monhystera parasimplex De Coninck, 1943 accepted as Eumonhystera parasimplex (De Coninck, 1943) Andrássy, 1981 accepted as Thalassomonhystera parasimplex (De Coninck, 1943) Jacobs, 1987 (additional source)
Monhystera parelegantula De Coninck, 1943 accepted as Monhystrella parelegantula (De Coninck, 1943) Andrássy, 1981 (additional source)
Monhystera parva (Bastian, 1865) Butschli, 1874 accepted as Thalassomonhystera parva (Bastian, 1865) Jacobs, 1987 (additional source)
Monhystera stagnalis Bastian, 1865 (additional source)
Neochromadora izhorica Schuurmans Stekhoven, 1935 accepted as Neochromadora izhorica (Filipjev, 1929) Schuurmans-Stekhoven, 1935 (additional source)
Odontophora armata (Ditlevsen, 1918) Allgén, 1929 (additional source)
Oncholaimus oxyuris Ditlevsen, 1911 (additional source)
Oxystomina elongata (Bütschli, 1874) Filipjev, 1921 (redescription)
Paracyatholaimus intermedius (de Man, 1880) Micoletzky, 1922 (additional source)
Sabatieria celtica Southern, 1914 (additional source)
Sphaerolaimus gracilis de Man, 1876 (redescription)
Sphaerolaimus hirsutus Bastian, 1865 (additional source)
Spilophorella papillata Kreis, 1929 (additional source)
Spilophorella paradoxa (de Man, 1888) Filipjev, 1917 (additional source)
Stephanolaimus spartinae Lorenzen, 1969 accepted as Setostephanolaimus spartinae (Lorenzen, 1969) Tchesunov, 1994 (original description)
Thalassoalaimus pirum Lorenzen, 1969 accepted as Litinium pirum (Lorenzen, 1969) Martelli, Lo Russo, Villares & Pastor de Ward, 2017 (original description)
Thalassoalaimus tardus de Man, 1893 (additional source)
Theristus ensifer Gerlach, 1951 (additional source)
Theristus pertenuis Schuurmans Stekhoven, 1935 (additional source)
Tricoma nematoides (Greeff, 1869) (additional source)
Tripyloides marinus (Bütschli, 1874) de Man, 1886 (additional source)
Viscosia viscosa (Bastian, 1865) de Man, 1890 (additional source)