• Abyssophilos ktis Jellinek & Swanson, 2003
• Acantharcturus acanthurus (Monod, 1925) accepted as Mixarcturus acanthurus (Monod, 1925)
• Acanthaspidia porrecta Menzies & Schultz, 1968 accepted as Iolanthe porrecta (Menzies & Schultz, 1968)
• Acanthocope spinicauda Beddard, 1885
• Acanthonotozomopsis pushkini (Bushueva, 1978)
• Acutihumerus cavooreni (Bacescu & Absalao, 1985)
• Adeliella laticornis Nicholls, 1938
• Aegiochus australis (Whitelegge, 1901)
• Aetideopsis tumorosa Bradford, 1969
• Agrenocythere cadoti Benson, 1972
• Akanthophoreus weddellensis Sieg, 1986 accepted as Parakanthophoreus weddellensis (Sieg, 1986)
• Alexandrella chione d'Udekem d'Acoz & Verheye, 2017
• Abyssocythere bensoni Brandão, Stuhlmann, Vital & Brandt, 2016
• Acanthamunnopsis hystrix Schultz, 1978
• Acanthaspidia pleuronotus (Menzies & Schultz, 1968) accepted as Iolanthe pleuronotus Menzies & Schultz, 1968
• Acanthocope galatheae Wolff, 1962
• Acanthonotozomoides sublitoralis Schellenberg, 1931
• Actinacanthus tricarinatus (Stebbing, 1883)
• Acutocoxae ogilvieae Horton, Ashford & Thurston in Ashford, Horton, Roterman, Thurston, Griffiths & Brandt, 2019
• Aegiochus antarctica (Hodgson, 1910)
• Aetideopsis rostrata Sars G.O., 1903
• Aglaia meridionalis Brady, 1880 accepted as Pontocypria meridionalis (Brady, 1880)
• Akanthophoreus australis (Beddard, 1886) accepted as Parakanthophoreus antarcticus (Vanhöffen, 1914)
• Alexandrella australis (Chilton, 1912)
• Abyssorchomene charcoti (Chevreux, 1912)
• Acantharcturus acutipleon Schultz, 1981
• Acanthaspidia rostrata (Menzies & Schultz, 1968) accepted as Iolanthe rostrata (Menzies & Schultz, 1968)
• Acanthomunna spinipes (Vanhöffen, 1914)
• Acanthoserolis polaris (Richardson, 1911)
• Acutiserolis gerlachei (Monod, 1925)
• Adeliella olivieri De Broyer, 1975
• Aegiochus glacialis (Tattersall, 1920)
• Aetideus arcuatus (Vervoort, 1949)
• Agrenocythere hazeli (Bold, 1946)
• Alacia alata (Müller, 1906)
• Alexandrella dentata Chevreux, 1912
• [non-Uristidae] georgianus (Schellenberg, 1931)
• Abyssorchomene rossi (Walker, 1903) represented as Pseudorchomene rossi (Walker, 1903)
• Acanthaspidia iolanthoidea Vasina & Kussakin, 1982 accepted as Iolanthe iolanthoidea (Vasina & Kussakin, 1982)
• Acanthephyra quadrispinosa Kemp, 1939
• Acanthonotozomella rauscherti Coleman & Jäger, 2001
• Accalathura gigantissima Kussakin, 1967
• Acutiserolis margaretae (Menzies, 1962)
• Aega psora (Linnaeus, 1758)
• Aetideopsis inflata Park, 1978 accepted as Aetideopsis rostrata Sars G.O., 1903
• Aetideus bradyi Scott A., 1909
• Akanthinotanais gaussi (Vanhöffen, 1914)
• Alacia hettacra (Müller, 1906)
• Alexandrella martae Berge & Vader, 2005
• [non-Uristidae] albinus (K.H. Barnard, 1932)
• Abyssorchomene plebs (Hurley, 1965) represented as Pseudorchomene plebs (Hurley, 1965)
• Acanthaspidia drygalskii Vanhöffen, 1914 accepted as Iolanthe drygalskii (Vanhöffen, 1914)
• Acanthephyra pelagica (Risso, 1816)
• Acanthonotozomella barnardi Watling & Holman, 1980
• Acartia (Acartiura) ensifera Brady, 1899
• Acutiserolis luethjei (Wägele, 1986)
• Aega koltuni Kussakin, 1967 accepted as Aegiochus antarctica (Hodgson, 1910)
• Aetideopsis antarctica (Wolfenden, 1908)
• Aetideus australis (Vervoort, 1957)
• Aitkenicythere striosulcata Dingle, 1984 †
• Alacia belgicae (Müller, 1906)
• Alexandrella mandibulata Berge & Vader, 2005
• Abyssocypris atlantica (Maddocks, 1977)
• Abyssorchomene scotianensis (Andres, 1983)
• Acanthaspidia longiramosa Vasina & Kussakin, 1982 accepted as Iolanthe longiramosa (Vasina & Kussakin, 1982)
• Acanthocope annulatus Menzies, 1962
• Acanthonotozomella trispinosa (Bellan-Santini, 1972)
• Acontiostoma marionis Stebbing, 1888
• Acutiserolis poorei Brandt, 2009
• Aegaeon boschii (Christoffersen, 1988)
• Aetideopsis minor (Wolfenden, 1911)
• Aetideus pseudarmatus Bradford, 1971
• Akanthinotanais guillei (Shiino, 1978)
• Alacia valdiviae (Müller, 1906)
• Alexandrella polarsterni (Berge & Vader, 2005)
• Abyssorchomene nodimanus (Walker, 1903)
• Acanthaspidia acanthonotus (Beddard, 1886) accepted as Iolanthe acanthonotus Beddard, 1886
• Acanthaspidia sulcatacornia Menzies & Schultz, 1968 accepted as Iolanthe sulcatacornia (Menzies & Schultz, 1968)
• Acanthonotozomella alata Schellenberg, 1926
• Acanthoserolis schythei (Lütken, 1858)
• Acutiserolis johnstoni (Hale, 1952)
• Adelta theta Kornicker, 1975
• Aegisthus mucronatus Giesbrecht, 1891
• Aetideus armatus (Boeck, 1872)
• Agulhasina sudoceanica Majoran & Widmark, 1998 †
• Alacia alata alata (Müller, G. W., 1906)
• Alexandrella inermis Bellan-Santini & Ledoyer, 1987
• Abyssocythere antarctica (Neale, 1967) accepted as Austrotrachyleberis antarctica (Neale, 1967)
• Abyssorchomene shannonae Hendrycks & De Broyer, 2022
• Acanthaspidia mucronata (Menzies & Schultz, 1968) accepted as Iolanthe mucronata (Menzies & Schultz, 1968)
• Acanthocope eleganta Malyutina & Brandt, 2004
• Acanthonotozomoides oatesi (K.H. Barnard, 1930)
• Acontiostoma tuberculata Lowry & Stoddart, 1983
• Acutiserolis spinosa (Kussakin, 1967)
• Aeginoides gaussi Schellenberg, 1926
• Aetideopsis multiserrata (Wolfenden, 1904)
• Agetus flaccus (Giesbrecht, 1891)
• Akanthophoreus antarcticus (Vanhöffen, 1914) accepted as Parakanthophoreus antarcticus (Vanhöffen, 1914)
• Alamprops comatus (Zimmer, 1907)
• Alexandrella pulchra Ren in Ren & Huang, 1991