• Acontiolaimus cylindricaudatus (Chitwood, 1951) Wieser, 1956 accepted as Deontolaimus cylindricaudatus (Chitwood, 1951) Holovachov & Boström, 2015
• Acontiolaimus uniformis (Cobb, 1920) Wieser, 1956 accepted as Deontolaimus uniformis (Cobb, 1920) Holovachov & Boström, 2015
• Acontiolaimus zostericola Filipjev, 1918 (uncertain > taxon inquirendum)
• Alaimella cincta Cobb, 1920
• Alaimella macramphis Tchesunov & Miljutina, 2007
• Alaimella truncata Cobb, 1920
• Anaplectus arenicola Killick, 1964 accepted as Anaplectus granulosus (Bastian, 1865) De Coninck & Schuurmans Stekhoven, 1933
• Anaplectus atubulatus Andrássy, 1987
• Anaplectus brzeskii Holovachov, Boström, Winiszewska & Hánĕl, 2004
• Anaplectus deconincki Shokoohi & Eisenback, 2023
• Anaplectus eurycerus (Massey, 1964) Andrássy, 1984
• Anaplectus grandepapillatus (Ditlevsen, 1928) Andrássy, 1973
• Anaplectus granulosus (Bastian, 1865) De Coninck & Schuurmans Stekhoven, 1933
• Anaplectus granulosus grandepapillatus (Ditlevsen, 1928) Gerlach & Riemann, 1973 accepted as Anaplectus grandepapillatus (Ditlevsen, 1928) Andrássy, 1973
• Anaplectus intermedius Truskova, 1972 accepted as Anaplectus grandepapillatus (Ditlevsen, 1928) Andrássy, 1973
• Anaplectus labiosulcus Jahan, Khan, Mahboob & Tahseen, 2020
• Anaplectus magnus Brzeski, 1963
• Anaplectus octo Zullini, 1973
• Anaplectus parasimilis Truskova, 1978
• Anaplectus porosus Allen & Noffsinger, 1968
• Anaplectus similis Allen & Noffsinger, 1968
• Anaplectus subgranulosus Truskova, 1978
• Anaplectus submersus (Hirschmann, 1952) Maggenti, 1961 accepted as Anaplectus grandepapillatus (Ditlevsen, 1928) Andrássy, 1973
• Anaplectus sudhausi Jahan, Khan, Mahboob & Tahseen, 2020
• Anaplectus tortus Andrássy, 1986
• Anaplectus varicaudatus Allen & Noffsinger, 1968
• Anguinoides profundus (Vitiello, 1974) Holovachov, 2003 accepted as Procamacolaimus profundus Vitiello, 1974
• Anguinoides stylosum Chitwood, 1936
• Anomonema deconincki Jensen, 1976
• Anomonema haplostoma Hopper, 1963
• Anonchus coomansi Eyualem, 1996
• Anonchus laureatus (Gerlach, 1957) Holovachov, Zullini, Loof & Bongers, 2002
• Anonchus maculatus (von Daday, 1905) Goodey, 1951
• Anonchus mangrovi Gerlach, 1957
• Anonchus millelacunatus (Andrássy, 1973) Holovachov, Zullini, Loof & Bongers, 2002
• Anonchus mirabilis (Hofmänner in Hofmänner & Menzel, 1914) Chitwood & Chitwood, 1936
• Anonchus monohystera Cobb, 1913 accepted as Anonchus maculatus (von Daday, 1905) Goodey, 1951
• Anonchus palaeotropicus Tsalolikhin, 1989
• Anonchus pulcher Zullini, Loof & Bongers, 2002
• Anonchus venezolanus Holovachov, Zullini, Loof & Bongers, 2002
• Anonchus winiszewskae Holovachov, Zullini, Loof & Bongers, 2002
• Anthonema revoluta Cobb, 1916 accepted as Anthonema revolutum Cobb, 1906
• Anthonema revolutum Cobb, 1906
• Antomicron alveolatum Villares & Pastor de Ward, 2011
• Antomicron chinensis Zhai, Wang & Huang, 2020
• Antomicron donsi (Allgén, 1947) accepted as Leptolaimus donsi (Allgén, 1947) Holovachov & Boström, 2013
• Antomicron elegans (de Man, 1922) De Coninck, 1965
• Antomicron holovachovi Zhai, Wang & Huang, 2020
• Antomicron intermedius Gagarin & Nguyen Vu Thanh, 2005
• Antomicron lorenzeni Holovachov, 2012
• Antomicron pellucidum Cobb, 1920
• Antomicron pratense Lorenzen, 1966
• Antomicron profundum Vitiello, 1971
• Antomicron quindecimpapillatus Holovachov, 2012
• Aphanolaimus aberrans Holovachov, Sturhan & Park, 2006
• Aphanolaimus anisitsi von Daday, 1905 accepted as Paraphanolaimus anisitsi (von Daday, 1905) Andrássy, 1968
• Aphanolaimus aquaticus von Daday, 1894
• Aphanolaimus attentus de Man, 1880
• Aphanolaimus aymarae De Waele & Coomans, 1993
• Aphanolaimus boliviensis De Waele & Coomans, 1993
• Aphanolaimus brasiliensis De Waele & Coomans, 1993
• Aphanolaimus camerunensis Holovachov, 2004
• Aphanolaimus chilensis Raski & Coomans, 1990
• Aphanolaimus cobbi Micoletzky, 1922 accepted as Aphanolaimus spiriferus Cobb, 1914
• Aphanolaimus communis Cobb in Cobb, 1915 accepted as Paraphanolaimus communis (Cobb in Cobb, 1915) Andrássy, 1984
• Aphanolaimus coomansus Tsalolikhin, 1988
• Aphanolaimus costatus Holovachov, 2004
• Aphanolaimus crassatus Siddiqi, 2009
• Aphanolaimus deconincki Coomans & De Waele, 1983
• Aphanolaimus duodecim-papillatus Kreis, 1932 (uncertain > taxon inquirendum)
• Aphanolaimus duplex Siddiqi, 2009
• Aphanolaimus elegans Raski & Coomans, 1990
• Aphanolaimus fuegoensis Raski & Coomans, 1990
• Aphanolaimus furcatus Siddiqi, 2009
• Aphanolaimus furcifer Andrássy, 1989
• Aphanolaimus longisetosus (Altherr, 1960) Andrássy, 1968
• Aphanolaimus louisae Coomans & De Waele, 1979
• Aphanolaimus microlaimus De Coninck, 1935
• Aphanolaimus microstomus (von Daday, 1905) Goodey, 1963 accepted as Aphanonchus multipapillatus (von Daday, 1905) Coomans & Raski, 1991
• Aphanolaimus minor Cobb, 1914 (uncertain > taxon inquirendum)
• Aphanolaimus multipapillatus von Daday, 1905 accepted as Aphanonchus multipapillatus (von Daday, 1905) Coomans & Raski, 1991
• Aphanolaimus perlitus Siddiqi, 2009
• Aphanolaimus pseudoattentus Coomans & De Waele, 1983
• Aphanolaimus pulcher Schneider, 1906 accepted as Sabatieria pulchra (Schneider, 1906) Riemann, 1970
• Aphanolaimus quechuae De Waele & Coomans, 1993
• Aphanolaimus recedens Siddiqi, 2009
• Aphanolaimus sclerolaimus Siddiqi, 2009
• Aphanolaimus seshadrii Raski & Coomans, 1990
• Aphanolaimus solitudinis Andrássy, 1968
• Aphanolaimus spiriferus Cobb, 1914
• Aphanolaimus strilliae Girgan, Marais, Fourie, Tiedt & Swart, 2019
• Aphanolaimus tritubifer Siddiqi, 2009
• Aphanolaimus trivialis Siddiqi, 2009
• Aphanolaimus tudoranceai Zullini, 1988
• Aphanolaimus unisexus Siddiqi, 2009
• Aphanolaimus vietnamicus Holovachov, Sturhan & Park, 2006
• Aphanolaimus viviparus Cobb in Cobb, 1915 (uncertain > taxon inquirendum)
• Aphanolaimus viviparus Plotnikoff, 1899
• Aphanolaimus westafricanus Siddiqi, 2009
• Aphanolaimus yamani Raski & Coomans, 1990