• Abbreviata abbreviata (Rudolphi, 1819)
• Abbreviata achari Mirza, 1935
• Abbreviata aechmespiculum Jones, 1978
• Abbreviata affinis Gedoelst, 1916
• Abbreviata anomala Jones, 1986
• Abbreviata antarctica Linstow, 1899
• Abbreviata bahamensis Moravec, Coy-Otero & Barus, 1990
• Abbreviata bancrofti Irwin-Smith, 1922
• Abbreviata barrowi Jones, 1978
• Abbreviata baylisi Chabaud, 1956
• Abbreviata benoiti Horchner & Weissenburg, 1965 accepted as Pseudabbreviata amaniensis Sandground, 1928
• Abbreviata boevi Shaikenov, 1966
• Abbreviata caucasica
• Abbreviata clelandi Irwin-Smith, 1922
• Abbreviata confusa Johnston & Mawson, 1942
• Abbreviata cyanogasteri Horchner & Weissenburg, 1965 accepted as Pseudabbreviata amaniensis Sandground, 1928
• Abbreviata damarensis Prudhoe & Harris, 1971
• Abbreviata demansiae Johnston & Mawson, 1948
• Abbreviata glebopalmae Jones, 1989
• Abbreviata hastaspicula Jones, 1979
• Abbreviata indica Soota, Srivastava & Ghosh, 1969
• Abbreviata kaulensis Jones, 1979
• Abbreviata kazachstanica Marcov & Paraskiv, 1956
• Abbreviata kimberleyensis Jones, 1989
• Abbreviata kolayatensis Soota & Chaturvedi, 1969
• Abbreviata kumarinae Jones, 1978
• Abbreviata kuwaitensis Khalil, Hassounah & Behbehani, 1979
• Abbreviata leiperi Skrjabin, 1924
• Abbreviata levicauda Jones, 1983
• Abbreviata markovi Annaev, 1972 accepted as Pseudabbreviata markovi (Annaev, 1972)
• Abbreviata melanesiensis Jones, 2004
• Abbreviata mirzai Soota & Chaturvedi, 1969
• Abbreviata nyassae Fitzsimmons, 1964
• Abbreviata occidentalis Jones, 1978 accepted as Abbreviata antarctica Linstow, 1899
• Abbreviata ortleppi (Sandground, 1928)
• Abbreviata paradoxa Linstow, 1908
• Abbreviata perenticola Jones, 1985
• Abbreviata pilbarensis Jones, 1986
• Abbreviata poicilometra Sandground, 1936
• Abbreviata polydentata Walton, 1932
• Abbreviata quadrovaria Leper, 1908
• Abbreviata ranae Walton, 1931
• Abbreviata schulzi Markov & Bogdanov, 1961
• Abbreviata terrapenis Hill, 1941
• Abbreviata tumidocapitis Jones, 1983
• Abbreviata turcomanica Andruschko & Marcov, 1956 accepted as Abbreviata turkomanica Andrushko & Markov, 1956
• Abbreviata turkomanica Andrushko & Markov, 1956
• Abbreviata uzbekistanica Bogdanov & Markov, 1955
• Abbreviata varani Parona, 1889
• Abirovulva insolita Hunt, 2002
• Ablechroiulus anchisporus Andrássy, 1966 accepted as Rhabditis anchispora Andrássy, 1966
• Ablechroiulus dudichi Andrássy, 1970 accepted as Rhabditis dudichi (Andrássy, 1970)
• Ablechroiulus maculosus Andrássy, 1982 accepted as Rhabditis maculosus (Andrássy, 1982)
• Ablechroiulus stercorarius Andrássy, 1987 accepted as Rhabditis stercorarius (Andrássy, 1987)
• Abos bathycola Rubtsov, 1980 accepted as Trophomera bathycola (Rubtsov, 1980)
• Acanthocheilonema dagestanica Jarulin, 1962 accepted as Acanthocheilonema dracunculoides (Cobbold, 1870)
• Acanthocheilonema didelphis (Esslinger & Smith, 1979)
• Acanthocheilonema dracunculoides (Cobbold, 1870)
• Acanthocheilonema filaria (Kou, 1958)
• Acanthocheilonema johnstoni (Mackerras, 1954)
• Acanthocheilonema pachycephalum Ortlepp, 1961
• Acanthocheilonema parbhani (Shastri, 2001)
• Acanthocheilonema pricei Vaz & Pereira, 1934
• Acanthocheilonema procyonis (Price, 1955)
• Acanthocheilonema reconditum
• Acanthocheilonema sabanicolae Eberhard & Campo-Aasen, 1986
• Acanthocheilonema spirocauda (Leidy, 1858)
• Acanthocheilonema viteae Krepkogorski, 1933
• Acanthocheilus bicuspis (Wedl, 1855)
• Acanthocheilus intermedius Örley, 1885 accepted as Acanthocheilus rotundatus (Rudolphi, 1819)
• Acanthocheilus quadridentatus Molin, 1858
• Acanthocheilus rotundatus (Rudolphi, 1819)
• Acanthocheilus zenis Baylis, 1929 accepted as Hysterothylacium zenis (Baylis, 1929)
• Acantholaimus aequisetosus Soetaert, 1988
• Acantholaimus aheneus Bussau, 1993
• Acantholaimus akvavitus Gerlach, Schrage & Riemann, 1979
• Acantholaimus angustus Bussau, 1993
• Acantholaimus arminius Gerlach, 1979
• Acantholaimus caecus Bussau, 1993
• Acantholaimus calathus Gerlach, 1979
• Acantholaimus coruscus Bussau, 1993
• Acantholaimus crenatus Soetaert, 1988
• Acantholaimus cyathibucca Vivier, 1985
• Acantholaimus effilatus Soetaert, 1988
• Acantholaimus elegans Jensen, 1988
• Acantholaimus ewensis Platt & Zhang, 1982
• Acantholaimus filicaudatus Soetaert, 1988
• Acantholaimus gathumai Muthumbi & Vincx, 1997
• Acantholaimus geraerti Muthumbi & Vincx, 1997
• Acantholaimus gigantasetosus Vivier, 1985
• Acantholaimus gigantisetosus Vivier, 1985
• Acantholaimus heipi Muthumbi & Vincx, 1997
• Acantholaimus incomptus Vivier, 1985
• Acantholaimus invaginatum Muthumbi & Vincx, 1997
• Acantholaimus iubilus Gerlach, Schrage & Riemann, 1979
• Acantholaimus longisetosus Allgén, 1933
• Acantholaimus longistriatus Gourbault & Vincx, 1985
• Acantholaimus macramphis Gourbault & Vincx, 1985
• Acantholaimus maks Gerlach, Schrage & Riemann, 1979
• Acantholaimus marks Gerlach, Shrage & Riemann, 1979