Amphimonhystera anechma (Southern, 1914) Lorenzen, 1977 (additional source)
Araeolaimus elegans de Man, 1888 (additional source)
Ascolaimus elongatus (Bütschli, 1874) Shuurmans Stekhoven & de Coninck, 1932 (additional source)
Axonolaimus helgolandicus Lorenzen, 1971 (additional source)
Bathylaimus inermis (Ditlevsen, 1918) De Man, 1922 (additional source)
Bathylaimus parafilicaudatus Allgén, 1935 accepted as Bathylaimus chesapeakensis Timm, 1952 (additional source)
Chaetonema canellatum Gerlach, 1956 (additional source)
Chromadorita nana Lorenzen, 1973 (additional source)
Chromadorita obliqua (Gerlach, 1953) Wieser, 1954 (additional source)
Coninckia circularis Gerlach, 1956 (additional source)
Cricolaimus elongatus Southern, 1914 (additional source)
Desmodora pontica Filipjev, 1922 (additional source)
Desmolaimus zeelandicus de Man, 1880 (additional source)
Desmoscolex falcatus Lorenzen, 1972 (additional source)
Dichromadora cucullata Lorenzen, 1973 (additional source)
Diplopeltula incisa (Southern, 1914) Gerlach, 1962 accepted as Neodiplopeltula incisa (Southern, 1914) Holovachov & Boström, 2018 (additional source)
Ditlevsenella danica Filipjev, 1927 (additional source)
Echinotheristus cimbricus Thun & Riemann, 1967 (additional source)
Echinotheristus teutonicus Thun & Riemann, 1967 (additional source)
Enoploides labrostriatus (Southern, 1914) Filipjev, 1921 (additional source)
Enoplolaimus conicollis Gerlach, 1952 (additional source)
Enoplolaimus litoralis Schulz, 1936 (additional source)
Enoplus communis Bastian, 1865 (additional source)
Epacanthion buetschlii (Southern, 1914) Wieser, 1953 (additional source)
Gammanema conicauda Gerlach, 1953 (additional source)
Halaphanolaimus pellucidus Southern, 1914 accepted as Leptolaimus pellucidus (Southern, 1914) Holovachov & Boström, 2013 (additional source)
Ixonema sordidum Lorenzen, 1971 (additional source)
Leptolaimus elegans (Stekhoven & De Coninck, 1933) Gerlach, 1958 (additional source)
Leptolaimus leptaleus Lorenzen, 1972 (original description)
Leptolaimus luridus Timm, 1963 (additional source)
Leptolaimus macer Lorenzen, 1972 (additional source)
Leptolaimus mixtus Lorenzen, 1972 (additional source)
Leptolaimus venustus Lorenzen, 1972 (additional source)
Leptonemella gorgo Gerlach, 1950 (additional source)
Litinium bananum Gerlach, 1956 (additional source)
Manunema proboscidis Gerlach, 1957 (additional source)
Mesacanthion diplechma (Southern, 1914) Filipjev, 1927 (additional source)
Metadesmolaimus aduncus Lorenzen, 1972 (additional source)
Metadesmolaimus heteroclitus Lorenzen, 1971 (additional source)
Metadesmolaimus pandus Lorenzen, 1971 (additional source)
Metadesmolaimus varians Lorenzen, 1972 (additional source)
Metalinhomoeus filiformis (de Man, 1907) accepted as Desmolaimus brasiliensis Gerlach, 1963 (additional source)
Metalinhomoeus setosus Chitwood, 1951 (additional source)
Metepsilonema hagmeieri (Stauffer, 1924) (additional source)
Monhystera Bastian, 1865 (additional source)
Neochromadora munita Lorenzen, 1971 (additional source)
Neochromadora poecilosoma (de Man, 1893) Micoletzky, 1924 (additional source)
Neotonchus meeki Warwick, 1971 (additional source)
Neotonchus vitius Warwick, 1971 (additional source)
Odontophora ornata Lorenzen, 1971 (additional source)
Odontophora phalarata Lorenzen, 1971 (additional source)
Odontophora rectangula Lorenzen, 1971 (additional source)
Oxyonchus dentatus (Ditlevsen, 1918) Filipjev, 1927 (additional source)
Oxystomina unguiculata Schuurmans Stekhoven, 1935 (additional source)
Paracanthonchus longicaudatus Warwick, 1971 (ecology source)
Paracanthonchus longus Allgén, 1934 (additional source)
Paracanthonchus macrodon (Ditlevsen, 1918) Micoletzky, 1924 (additional source)
Paracyatholaimus occultus Gerlach, 1956 (additional source)
Paracyatholaimus pentodon Riemann, 1966 (additional source)
Paralinhomoeus de Man, 1907 accepted as Linhomoeus Bastian, 1865 (additional source)
Paralinhomoeus ilenensis (Allgén, 1933) Gerlach, 1963 accepted as Linhomoeus ilenensis (Allgén, 1933) Gerlach, 1963 (additional source)
Paralongicyatholaimus macramphis Lorenzen, 1972 (additional source)
Paralongicyatholaimus minutus Warwick, 1971 (additional source)
Pararaeolaimus nudus (Gerlach, 1951) (additional source)
Perepsilonema crassum Lorenzen, 1973 (additional source)
Pomponema ammophilum Lorenzen, 1972 (additional source)
Pomponema astrodes Lorenzen, 1972 (additional source)
Pomponema compactum Lorenzen, 1972 (additional source)
Pomponema debile Lorenzen, 1972 (additional source)
Pomponema elegans Lorenzen, 1972 (additional source)
Pomponema multipapillatum (Filipjev, 1922) Wieser, 1954 (additional source)
Pontonema ditlevseni (Schuurmans Stekhoven in Kreis, 1934) Cobb & Steiner, 1934 (additional source)
Prochromadorella attenuata (Gerlach, 1952) Lorenzen, 1972 (additional source)
Prochromadorella ditlevseni (de Man, 1922) Wieser, 1954 (additional source)
Prochromadorella longicaudata (Kreis, 1929) Lorenzen, 1972 accepted as Trichromadora longicaudata Kreis, 1929 (additional source)
Prochromadorella paramucrodonta (Allgén, 1929) Wieser, 1951 (additional source)
Rhabdodemania gracilis (Ditlevsen, 1918) Baylis & Daubney, 1926 (additional source)
Rhabdodemania minor (Southern, 1914) Baylis & Daubney, 1926 (additional source)
Rhadinema flexile Cobb, 1920 (additional source)
Rhynchonema lyngei (Allgén, 1940) Gerlach, 1953 (additional source)
Rhynchonema scutatum Lorenzen, 1972 (additional source)
Richtersia inaequalis Riemann, 1966 (additional source)
Sabatieria celtica Southern, 1914 (additional source)
Sabatieria longicaudata Filipjev, 1922 (additional source)
Sabatieria macramphis Lorenzen, 1971 (additional source)
Sabatieria ornata (Ditlevsen, 1918) Filipjev, 1922 (additional source)
Sabatieria pulchra (Schneider, 1906) Riemann, 1970 (additional source)
Sabatieria strigosa Lorenzen, 1971 (additional source)
Siphonolaimus cobbi Riemann, 1966 (additional source)
Siphonolaimus niger de Man, 1893 (additional source)
Sphaerolaimus macrocirculus Filipjev, 1918 (additional source)
Sphaerolaimus ostreae Filipjev, 1918 (additional source)
Spirinia laevis (Bastian, 1865) Gerlach, 1963 (additional source)
Stephanolaimus elegans Ditlevsen, 1918 (additional source)
Stephanolaimus flevensis Schuurmans Stekhoven, 1935 accepted as Setostephanolaimus flevensis (Schuurmans Stekhoven, 1935) Tchesunov, 1994 (additional source)
Synonchiella riemanni Warwick, 1970 (additional source)
Terschellingia longicaudata de Man, 1907 (additional source)
Thalassoalaimus septentrionalis Filipjev, 1927 (additional source)
Thalassoalaimus tardus de Man, 1893 (additional source)
Theristus anisotrichus Lorenzen, 1971 (additional source)