• Abasia inflata Cressey & Cressey, 1979
• Abasia pillaii Cressey & Cressey, 1979
• Abasia platyrostris Pillai, 1963
• Abasia pseudorostris Wilson C.B., 1908
• Abasia pusilla Cressey & Cressey, 1979
• Abasia tripartita (Shiino, 1955)
• Abyssopontius altus Stock, 1985
• Acespadia pomposa Leigh-Sharpe, 1933
• Achtheinus chinensis Thomsen, 1949 accepted as Achtheinus pinguis Wilson C.B., 1912
• Achtheinus dentatus Wilson C.B., 1911
• Achtheinus galeorhini Yamaguti, 1936 accepted as Achtheinus pinguis Wilson C.B., 1912
• Achtheinus impenderus Shen & Wang, 1958 accepted as Achtheinus pinguis Wilson C.B., 1912
• Achtheinus intermedius (Kurtz, 1924) accepted as Achtheinus pinguis Wilson C.B., 1912
• Achtheinus japonicus Wilson C.B., 1922 accepted as Achtheinus pinguis Wilson C.B., 1912
• Achtheinus oblongus Wilson C.B., 1908
• Achtheinus parvidens Wilson C.B., 1923 accepted as Achtheinus pinguis Wilson C.B., 1912
• Achtheinus pinguis Wilson C.B., 1912
• Achtheinus platensis Thomsen, 1949 accepted as Achtheinus pinguis Wilson C.B., 1912
• Achtheres ambloplitis Kellicott, 1882
• Achtheres carpenteri Packard, 1874 accepted as Salmincola carpenteri (Packard, 1874) accepted as Salmincola californiensis (Dana, 1852)
• Achtheres coregoni (Smith S.I., 1874) accepted as Salmincola extensus (Kessler, 1868)
• Achtheres coregoni Baumann, 1913 (uncertain > taxon inquirendum)
• Achtheres corpulentus Kellicott, 1882 accepted as Salmincola corpulentus (Kellicott, 1882)
• Achtheres extensus (Kessler, 1868) accepted as Salmincola extensus (Kessler, 1868)
• Achtheres galei (Krøyer, 1837) accepted as Lernaeopoda galei Krøyer, 1837
• Achtheres lacae Krøyer, 1863
• Achtheres micropteri Wright R., 1882
• Achtheres percarum von Nordmann, 1832
• Achtheres pimelodi Krøyer, 1863
• Achtheres pseudobasanistes Zandt, 1935 accepted as Salmincola coregonorum (Kessler, 1868)
• Achtheres sandrae Gadd, 1901
• Achtheres selachiorum Kurz, 1877 accepted as Lernaeopoda galei Krøyer, 1837
• Achtheres sibirica Messjatzeff, 1928 accepted as Achtheres percarum von Nordmann, 1832
• Achtheres strigatus Markevich, 1936 accepted as Salmincola strigatus (Markevich, 1936)
• Acontiophorus angulatus Thompson I.C., 1888 accepted as Acontiophorus scutatus (Brady & Robertson, 1873)
• Acontiophorus antennatus Hansen, 1923
• Acontiophorus armatus Brady, 1880
• Acontiophorus bracatus Stock & Kleeton, 1963 accepted as Orecturus bracatus (Stock & Kleeton, 1963)
• Acontiophorus brevifurcatus Stock, 1966
• Acontiophorus elongatus Scott T. & Scott A., 1894 accepted as Scottocheres elongatus (Scott T. & Scott A., 1894)
• Acontiophorus estivalis Lee, Chang & Kim, I.H., 2022
• Acontiophorus excavatus Humes, 1989 accepted as Orecturus excavatus (Humes, 1989)
• Acontiophorus maldivensis Sewell, 1949
• Acontiophorus monanchorae Johnsson, 2002
• Acontiophorus ornatus (Brady & Robertson, 1876)
• Acontiophorus panamensis Kim I.H., 2004
• Acontiophorus pilosus Kim I.H. & Je, 2000
• Acontiophorus scutatus (Brady & Robertson, 1873)
• Acontiophorus tynani Eiselt, 1965
• Acontiophorus ushuaiensis Johnsson, 2001
• Acontiophorus zealandicus Nicholls, 1944
• Advena paradoxa (Beneden, 1851) accepted as Kabatazus paradoxus (Beneden, 1851)
• Aethon bicamera Boxshall, Bernot, Barton, Diggles, Yong, Atkinson-Coyle & Hutson, 2020
• Aethon garricki Hewitt, 1968
• Aethon globosus (Pillai, 1968)
• Aethon morelandi Hewitt, 1968
• Aethon percis (Thomson G.M., 1890)
• Aethon priacanthi (Kirtisinghe, 1956)
• Aethon quadratus Krøyer, 1837
• Alanlewisia fallolunulus (Lewis, A.G., 1967)
• Albionella centroscyllii (Hansen, 1923) accepted as Neoalbionella centroscyllii (Hansen, 1923)
• Albionella etmopteri (Yamaguti, 1939) accepted as Neoalbionella etmopteri (Yamaguti, 1939)
• Albionella fabricii Rubec & Hogans, 1988 accepted as Neoalbionella fabricii (Rubec & Hogans, 1988)
• Albionella globosa (Leigh-Sharpe, 1918) accepted as Neoalbionella globosa (Leigh-Sharpe, 1918)
• Albionella kabatai Benz & Izawa, 1990 accepted as Neoalbionella kabatai (Benz & Izawa, 1990)
• Albionella longicaudata (Hansen, 1923) accepted as Neoalbionella longicaudata (Hansen, 1923)
• Alebion alatus Gnanamuthu, 1951 accepted as Alebion maculatus Wilson C.B., 1932
• Alebion carchariae Krøyer, 1863
• Alebion crassus Wilson C.B., 1932
• Alebion difficile (Beneden, 1892) accepted as Alebion difficilis (Beneden, 1892)
• Alebion difficilis (Beneden, 1892)
• Alebion echinatus Capart, 1953 accepted as Alebion crassus Wilson C.B., 1932
• Alebion elegans Capart, 1953
• Alebion eulami Kumar, 1990 (unaccepted > interim unpublished)
• Alebion fuscus Wilson C.B., 1921 accepted as Alebion carchariae Krøyer, 1863
• Alebion glaber Wilson C.B., 1905
• Alebion glabrum Wilson C.B., 1905 accepted as Alebion glaber Wilson C.B., 1905
• Alebion gracile Wilson C.B., 1905 accepted as Alebion gracilis Wilson C.B., 1905
• Alebion gracilis Wilson C.B., 1905
• Alebion lobatus Cressey, 1970
• Alebion maculatus Wilson C.B., 1932
• Alebion megacephalus Kirtisinghe, 1956 accepted as Alebion maculatus Wilson C.B., 1932
• Alebion pacificus Cressey, 1972
• Alebion spinosus Rangnekar, 1959 accepted as Alebion maculatus Wilson C.B., 1932
• Alebion walbei Kumar, 1990 (unaccepted > interim unpublished)
• Alella berecynthia Leigh-Sharpe, 1936 accepted as Clavellomimus berecynthia (Leigh-Sharpe, 1936)
• Alella canthari (Heller, 1865) accepted as Alella pagelli (Krøyer, 1863)
• Alella ditrematis (Yamaguti, 1939) accepted as Alella pagelli (Krøyer, 1863)
• Alella gibbosa van Niekerk & Oliver, 1995 accepted as Alella pagelli (Krøyer, 1863)
• Alella igillimpethu Erasmus, Hadfield, Wepener & Smit, 2022
• Alella macrotrachelus (Brian, 1906) accepted as Alella pagelli (Krøyer, 1863)
• Alella pagelli (Krøyer, 1863)
• Alella pterobrachiata (Kabata, 1968) accepted as Alella pagelli (Krøyer, 1863)
• Alella tarakihi Hewitt & Blackwell, 1987 accepted as Clavellotis tarakihi (Hewitt & Blackwell, 1987)
• Alicaligus tripartitus Shiino, 1955 accepted as Abasia tripartita (Shiino, 1955)
• Allantogynus delamarei Changeux, 1960
• Allotrifur chlorophthalmi (Yamaguti, 1939)
• Altopontius altus (Stock, 1985) accepted as Abyssopontius altus Stock, 1985
• Amalomyzon elongatum Kim, I.H. & T.J. Lee, 2023
• Amaterasia amanoiwatoi Izawa, 2008