• Acanthomicrolaimus jenseni Stewart & Nicholas, 1987
• Acanthopharyngoides bidentatus Jensen, 1985
• Acanthopharyngoides chitwoodi Wieser, 1954
• Acanthopharyngoides duplex Gerlach, 1963
• Acanthopharyngoides quintus Riemann & Schrage, 1977
• Acanthopharyngoides scleratus Chitwood, 1936
• Acanthopharyngoides tyrrhenicus Wieser, 1954
• Acanthopharynx affinis Marion, 1870
• Acanthopharynx brachycapitata (Allgén, 1947) Gerlach, 1963 (uncertain > taxon inquirendum)
• Acanthopharynx denticulatus Wieser, 1954
• Acanthopharynx distechei Decraemer & Coomans, 1978
• Acanthopharynx dormitata Leduc & Zhao, 2016
• Acanthopharynx japonica Steiner & Hoeppli, 1926
• Acanthopharynx marioni Schuurmans Stekhoven, 1942 accepted as Acanthopharynx micans (Eberth, 1863) Marion, 1870
• Acanthopharynx merostomacha (Steiner, 1921) Schuurmans Stekhoven, 1943 (uncertain > taxon inquirendum)
• Acanthopharynx micans (Eberth, 1863) Marion, 1870
• Acanthopharynx micramphis Schuurmans Stekhoven, 1942
• Acanthopharynx nuda (Cobb, 1920) Gerlach, 1963
• Acanthopharynx oculata Marion, 1870 accepted as Cyatholaimus oculatus (Marion, 1870) Rouville, 1905
• Acanthopharynx parva Tchesunov, Rodriguez Garcia, Simakova & Mokievsky, 2023
• Acanthopharynx perarmata Marion, 1870
• Acanthopharynx rigida Schuurmans Stekhoven, 1950
• Acanthopharynx seticauda Schuurmans Stekhoven, 1950 accepted as Acanthopharynx micans (Eberth, 1863) Marion, 1870
• Acanthopharynx setosissima Schuurmans Stekhoven, 1943 (uncertain > taxon inquirendum)
• Acanthopharynx similis (Allgén, 1932) Gerlach, 1963 (uncertain > taxon inquirendum)
• Acanthopharynx striatipunctata Marion, 1870 accepted as Cyatholaimus striatipunctatus (Marion, 1870) Wieser, 1954
• Aculeonchus sphaericus Kreis, 1928 accepted as Desmodora (Croconema) sphaericum (Kreis, 1928) Luc & De Coninck, 1959 accepted as Croconema sphaerica (Kreis, 1928) Gerlach, 1963
• Adelphos rolandi Ott, 1997
• Akanthepsilonema helleouetae Gourbault & Decraemer, 1991
• Akanthepsilonema oceanopolis Zeppilli, Bongiorni, Decraemer & Vanreusel, 2014
• Akanthepsilonema sinecornibus Raes, Decraemer & Vanreusel, 2006
• Alaimonema multicinctum Cobb, 1920 (uncertain > taxon inquirendum)
• Amphispira rotundicephala Cobb, 1920
• Apenodraconema chlidosis Allen & Noffsinger, 1978
• Apenodraconema spinicaudum (Gerlach, 1958) Allen & Noffsinger, 1978
• Aponchium conicaudatum Allgén, 1951 (uncertain > taxon inquirendum)
• Aponchium cylindricolle Cobb, 1920
• Aponema abyssalis (Miljutin & Miljutina, 2009) Tchesunov, 2014
• Aponema bathyalis Kovalyev & Miljutina, 2009 accepted as Microlaimus bathyalis (Kovalev & Miljutina, 2009) Tchesunov, 2014
• Aponema decraemerae Muthumbi & Vincx, 1999
• Aponema martinezi Miljutin & Miljutina, 2009 accepted as Microlaimus martinezi (Miljutin & Miljutina, 2009) Tchesunov, 2014
• Aponema minutissima Kovalyev & Miljutina, 2009 accepted as Microlaimus minutissimus (Kovalev & Miljutina, 2009) Tchesunov, 2014
• Aponema mnazi Muthumbi & Vincx, 1999 accepted as Microlaimus mnazi (Muthumbi & Vincx, 1999)
• Aponema nanum (Blome, 1982) Kovalyev & Miljutina, 2009 represented as Microlaimus nanus Blome, 1982
• Aponema ninae Portnova, 2009
• Aponema nympha Bussau & Vopel, 1999 accepted as Aponema nympha Bussau, 1993 accepted as Microlaimus nympha (Bussau & Vopel, 1999) Tchesunov, 2014
• Aponema nympha Bussau, 1993 accepted as Microlaimus nympha (Bussau & Vopel, 1999) Tchesunov, 2014
• Aponema papillatum Pastor de Ward, 1980
• Aponema pontica Revkova, 2017
• Aponema pseudotorosum Fu & Leduc, 2019
• Aponema subtile Leduc & Wharton, 2008
• Aponema torosa (Lorenzen, 1973) Jensen, 1978 accepted as Aponema torosum (Lorenzen, 1973) Jensen, 1978
• Aponema torosum (Lorenzen, 1973) Jensen, 1978
• Aponema torosus (Lorenzen, 1973) Jensen, 1978 accepted as Aponema torosum (Lorenzen, 1973) Jensen, 1978
• Aponema westindicum Kovalyev & Miljutina, 2009 accepted as Microlaimus westindicus (Kovalev & Miljutina, 2009) Tchesunov, 2014
• Archepsilonema adelum Steiner, 1931 accepted as Archepsilonema celidotum Steiner, 1931
• Archepsilonema bathycolum Steiner, 1931 accepted as Archepsilonema celidotum Steiner, 1931
• Archepsilonema celidotum Steiner, 1931
• Archepsilonema gaussi Steiner, 1931 accepted as Archepsilonema celidotum Steiner, 1931
• Archepsilonema microamphidis Steiner, 1931 accepted as Archepsilonema celidotum Steiner, 1931
• Archepsilonema poicilocricum Steiner, 1931 accepted as Archepsilonema celidotum Steiner, 1931
• Archepsilonema sagmacricum Steiner, 1931 accepted as Archepsilonema celidotum Steiner, 1931
• Archepsilonema schizocricum Steiner, 1931 accepted as Archepsilonema celidotum Steiner, 1931
• Bathychaetosoma uchidai (Kito, 1983) Decraemer, Gourbault & Backeljau, 1997
• Bathyepsilonema anulosum Verschelde & Vincx, 1992
• Bathyepsilonema bahiae Gerlach, 1957 accepted as Perepsilonema bahiae (Gerlach, 1957) Lorenzen, 1973
• Bathyepsilonema brachycephalum Steiner, 1931
• Bathyepsilonema cobbi Steiner, 1931
• Bathyepsilonema compactum Clasing, 1984
• Bathyepsilonema condylocricum Steiner, 1931 accepted as Bathyepsilonema brachycephalum Steiner, 1931
• Bathyepsilonema cricotum Steiner, 1931 accepted as Bathyepsilonema brachycephalum Steiner, 1931
• Bathyepsilonema dermoglyphum Gourbault & Decraemer, 1987
• Bathyepsilonema dicampterum Steiner, 1931 accepted as Bathyepsilonema brachycephalum Steiner, 1931
• Bathyepsilonema drygalskii Steiner, 1931
• Bathyepsilonema gracilis accepted as Bathyepsilonema brachycephalum Steiner, 1931
• Bathyepsilonema lissum Clasing, 1984
• Bathyepsilonema lopheliae Raes, Vanreusel & Decraemer, 2003
• Bathyepsilonema monniotorum Gourbault & Decraemer, 1987
• Bathyepsilonema pustulatum Gerlach, 1952 accepted as Epsilonema pustulatum (Gerlach, 1952)
• Bathyepsilonema salvati Gourbault & Decraemer, 1992
• Bathyepsilonema spongiosum Clasing, 2005
• Bathyepsilonema vulgare Gourbault & Decraemer, 1987
• Bathynox clavata (Bussau, 1993) Bussau & Vopel, 1999
• Bla nini Inglis, 1963 accepted as Desmodora nini (Inglis, 1963) Verschelde, Gourbault & Vincx, 1998
• Bolbolaimus abebei Muthumbi, 1999 (uncertain > taxon inquirendum)
• Bolbolaimus amabilis de Man, 1922 (uncertain > taxon inquirendum)
• Bolbolaimus bahari Muthumbi, 1999 (uncertain > taxon inquirendum)
• Bolbolaimus brevis Gagarin & Thanh, 2019
• Bolbolaimus chitwoodi (Gerlach, 1950) Jensen, 1978
• Bolbolaimus cobbi Chitwood, 1937 (1938) (uncertain > taxon inquirendum)
• Bolbolaimus crassiceps (Gerlach, 1953) Jensen, 1978
• Bolbolaimus dentatus (Allgén, 1935) Jensen, 1978 accepted as Pseudomicrolaimus dentatus (Allgén, 1935) Sergeeva, 1976 op. Kovalyev & Tchesunov, 2005
• Bolbolaimus denticulatus Gerlach, 1953 accepted as Pseudomicrolaimus denticulatus (Gerlach, 1953) Kovalyev & Tchesunov, 2005
• Bolbolaimus leptus Gagarin & Nguyen Vu Thanh, 2019
• Bolbolaimus longisetosus (Jensen, 1985) Muthumbi et al., 1995 accepted as Desmodora (Bolbonema) longisetosum (Jensen, 1985) accepted as Bolbonema longisetosum (Jensen, 1985) Verschelde et al., 1998
• Bolbolaimus murinae (Sergeeva, 1976) Jensen, 1978 accepted as Pseudomicrolaimus murinae Sergeeva, 1976
• Bolbolaimus obesus Phan Ke Long, Gagarin, Nguyen Dinh Tu, Nguyen Thi Xuan Phuong & Nguyen Vu Thanh, 2017
• Bolbolaimus parvus Gagarin & Nguyen Vu Thanh, 2019
• Bolbolaimus pellucidus Cobb, 1920 accepted as Chromaspirina pellucida (Cobb, 1920) Luc & Deconinck, 1959
• Bolbolaimus punctatus Cobb, 1920