• Abirovulva insolita Hunt, 2002
• Acanthocheilonema odendhali (Perry, 1967) Measures, Gosselin & Bergeron, 1997
• Acanthocheilonema spirocauda (Leidy, 1858)
• Acanthocheilus australis (Johnston & Mawson, 1945) accepted as Acanthocheilus rotundatus (Rudolphi, 1819)
• Acanthocheilus bicuspis (Wedl, 1855) accepted as Acanthocheilus rotundatus (Rudolphi, 1819)
• Acanthocheilus intermedius Örley, 1895 (uncertain > taxon inquirendum)
• Acanthocheilus nidifex Linton, 1901 accepted as Terranova nidifex (Linton, 1901) Johnston & Mawson, 1945
• Acanthocheilus quadridentatus Molin, 1858 accepted as Acanthocheilus rotundatus (Rudolphi, 1819)
• Acanthocheilus rotundatus (Rudolphi, 1819)
• Acanthoxyurus (Acanthoxyurus) anacanthos Hugot, 1985
• Acanthoxyurus (Acanthoxyurus) anomaluri Sandground, 1928
• Acanthoxyurus (Acanthoxyurus) beecrofti Hugot, 1985
• Acanthoxyurus (Acanthoxyurus) coronata (Quentin, 1974)
• Acanthoxyurus (Acanthoxyurus) hunkeleri (Quentin, 1974)
• Acanthoxyurus (Acanthoxyurus) obubra (Baylis, 1936)
• Acanthoxyurus (Acanthoxyurus) vincenti (Quentin, 1974)
• Acanthoxyurus (Petronema) shortridgei (Mönnig, 1931)
• Acanthoxyurus coronata Quentin, 1974 accepted as Acanthoxyurus (Acanthoxyurus) coronata (Quentin, 1974)
• Acanthoxyurus hunkeleri Quentin, 1974 accepted as Acanthoxyurus (Acanthoxyurus) hunkeleri (Quentin, 1974)
• Acanthoxyurus shortridgei Mönnig, 1931 accepted as Acanthoxyurus (Petronema) shortridgei (Mönnig, 1931)
• Acanthoxyurus vincenti Quentin, 1974 accepted as Acanthoxyurus (Acanthoxyurus) vincenti (Quentin, 1974)
• Acuaria europaea Mutafchiev, Mariaux & Georgiev, 2017
• Acuaria hamulosa (Diesing, 1851)
• Acuaria hargilae Baylis & Daubney, 1923 accepted as Syncuaria hargilae (Baylis & Daubney, 1923)
• Acuaria spirales Molin, 1858
• Adelonema trichosuri (Johnston & Mawson, 1938)
• Afrocarnoya fimbriifer Hunt, 1998
• Afrophilometra hydrocyoni (Fahmy, Mandour & El-Nafar, 1976) Moravec, Charo-Karisa & Jirků, 2009
• Agamascaris septentrionalis Kreis, 1952 (uncertain > nomen dubium)
• Agamonema flesi Linstow, 1878 (uncertain > taxon inquirendum)
• Agamonema infestans Christie, 1930 (uncertain > taxon inquirendum)
• Agamonema leuciscirutili Diesing, 1851 accepted as Raphidascaris (Raphidascaris) acus (Bloch, 1779) Railliet & Henry, 1915
• Agamonema migrans Christie, 1930 (uncertain > taxon inquirendum)
• Agamonematodum hospes von Linstow, 1882 (uncertain > taxon inquirendum)
• Agamonematodum necrophori von Linstow, 1878 (uncertain > taxon inquirendum)
• Agamonematodum vespillonis von Linstow, 1878 (uncertain > taxon inquirendum)
• Agamospirura tessellati Sharpilo, 1964 accepted as Streptocara crassicauda (Creplin, 1829) Skrjabin, 1916
• Aglaopterixia manni Chitwood, 1932 accepted as Protrellus manni (Chitwood, 1932)
• Agrachanus scardinii (Molnar, 1966) Tichomirova in Ivashkin, Sobolve & Khomorova, 1971
• Alaeuris alaeuris Thapar, 1925 accepted as Alaeuris numidica (Seurat, 1918)
• Alaeuris asirensis Adamson & Nasher, 1984
• Alaeuris auricularis (Walton, 1942)
• Alaeuris brachylophi Johnston & Mawson, 1944
• Alaeuris brevicollis (Walton, 1927)
• Alaeuris caballeroi Petter & Douglass, 1976
• Alaeuris caudaatus (Lent & Freitas, 1948)
• Alaeuris clementensis (Telford, 1965)
• Alaeuris conolophi Cuckler, 1938
• Alaeuris conspicua Ortlepp, 1933
• Alaeuris dupuisi Petter, 1966
• Alaeuris forcipiformis Forstner, 1960 accepted as Alaeuris numidica (Seurat, 1918)
• Alaeuris galapagensis Cuckler, 1938
• Alaeuris geochelone Matsuo, Ganzorig, Oku & Kamiya, 1999
• Alaeuris gopheri Petter & Douglass, 1976
• Alaeuris gopheri gopheri Petter & Douglass, 1976
• Alaeuris gopheri macrolabiata Petter & Douglass, 1976
• Alaeuris hirsutus Sandground, 1929
• Alaeuris iguanae Thapar, 1925
• Alaeuris insularis Petter, 1966
• Alaeuris kinsellai Petter & Douglas, 1976
• Alaeuris kinsellai kinsellai Petter & Douglas, 1976
• Alaeuris kinsellai sonorae Petter & Douglass, 1976
• Alaeuris labicula Cuckler, 1938
• Alaeuris longicollis (Walton, 1927)
• Alaeuris longispicula Cuckler, 1938
• Alaeuris macroptera (Walton, 1942)
• Alaeuris madagascariensis Petter, 1966
• Alaeuris mazzottii Petter & Douglass, 1976
• Alaeuris mexicana Moravec, Salgado-Maldonado & Mayen-Pena, 1996
• Alaeuris numidica (Seurat, 1918)
• Alaeuris numidica canariensis Zapatero, Castano & Zapatero, 1999
• Alaeuris numidica numidica (Seurat, 1918)
• Alaeuris numidica yumanae (Edgerly, 1952)
• Alaeuris paramazzottii Petter & Douglass, 1976
• Alaeuris pharyngodentata (Walton, 1942)
• Alaeuris poweri (Ortlepp, 1933)
• Alaeuris priapus (Telford, 1965)
• Alaeuris pudica Petter & Douglass, 1976
• Alaeuris quadrilabiata (Ortlepp, 1933)
• Alaeuris rifkii Akhtar, 1947
• Alaeuris riversianae (Telford, 1965)
• Alaeuris sauromali (Telford, 1965)
• Alaeuris stehlini Zapatero, Castano & Zapatero, 1999
• Alaeuris travassosi (Vigueras, 1938)
• Alaeuris venustus Leidy, 1856
• Alaeuris vogelsangi (Lent & Freitas, 1948)
• Alaeuris yumanae Edgerly, 1952
• Alaeuris yumanae brevispicula (Telford, 1965)
• Aliascaris aetoplatea Luo, 2001 accepted as Terranova aetoplatea (Luo, 2001) Li, Gibson & Zhang, 2016
• Aliascaris indica Kalyankar, 1971
• Alibagascaris pseudosciaenae Kalyankar, 1971
• Alinema alii Rasheed, 1963 accepted as Alinema amazonicum (Travassos, 1960) Moravec, Scholz, Dykovà, Kuchgta, Fiala & Kohn, 2006
• Alinema amazonicum (Travassos, 1960) Moravec, Scholz, Dykovà, Kuchgta, Fiala & Kohn, 2006
• Amphicaecum parvum Chandler, 1935 (uncertain > taxon inquirendum)
• Amphicaecum regale Walton, 1927 (uncertain > taxon inquirendum)
• Amplicaecum africanum Taylor, 1924
• Amplicaecum indica Srivastava & Gupta, 1975 (uncertain > nomen dubium)
• Amplicaecum mugili Gupta & Srivastava, 1984 (uncertain > nomen dubium)
• Amplicaecum orientalis Wang, 1965 accepted as Ophidascaris orientalis (Wang, 1965) Sprent, 1988
• Amplicaecum orissai Gupta & Srivastava, 1984 (uncertain > nomen dubium)