• [non-Uristidae] albinus (K.H. Barnard, 1932)
• [non-Uristidae] georgianus (Schellenberg, 1931)
• Abyssorchomene charcoti (Chevreux, 1912)
• Abyssorchomene nodimanus (Walker, 1903)
• Abyssorchomene plebs (Hurley, 1965) represented as Pseudorchomene plebs (Hurley, 1965)
• Abyssorchomene rossi (Walker, 1903) represented as Pseudorchomene rossi (Walker, 1903)
• Abyssorchomene scotianensis (Andres, 1983)
• Abyssorchomene shannonae Hendrycks & De Broyer, 2022
• Acanthamunnopsis hystrix Schultz, 1978
• Acantharcturus acanthurus (Monod, 1925) accepted as Mixarcturus acanthurus (Monod, 1925)
• Acantharcturus acutipleon Schultz, 1981
• Acanthaspidia acanthonotus (Beddard, 1886) accepted as Iolanthe acanthonotus Beddard, 1886
• Acanthaspidia drygalskii Vanhöffen, 1914 accepted as Iolanthe drygalskii (Vanhöffen, 1914)
• Acanthaspidia iolanthoidea Vasina & Kussakin, 1982 accepted as Iolanthe iolanthoidea (Vasina & Kussakin, 1982)
• Acanthaspidia longiramosa Vasina & Kussakin, 1982 accepted as Iolanthe longiramosa (Vasina & Kussakin, 1982)
• Acanthaspidia mucronata (Menzies & Schultz, 1968) accepted as Iolanthe mucronata (Menzies & Schultz, 1968)
• Acanthaspidia pleuronotus (Menzies & Schultz, 1968) accepted as Iolanthe pleuronotus Menzies & Schultz, 1968
• Acanthaspidia porrecta Menzies & Schultz, 1968 accepted as Iolanthe porrecta (Menzies & Schultz, 1968)
• Acanthaspidia rostrata (Menzies & Schultz, 1968) accepted as Iolanthe rostrata (Menzies & Schultz, 1968)
• Acanthaspidia sulcatacornia Menzies & Schultz, 1968 accepted as Iolanthe sulcatacornia (Menzies & Schultz, 1968)
• Acanthephyra pelagica (Risso, 1816)
• Acanthephyra quadrispinosa Kemp, 1939
• Acanthocope annulatus Menzies, 1962
• Acanthocope eleganta Malyutina & Brandt, 2004
• Acanthocope galatheae Wolff, 1962
• Acanthocope spinicauda Beddard, 1885
• Acanthomunna spinipes (Vanhöffen, 1914)
• Acanthonotozomella alata Schellenberg, 1926
• Acanthonotozomella barnardi Watling & Holman, 1980
• Acanthonotozomella rauscherti Coleman & Jäger, 2001
• Acanthonotozomella trispinosa (Bellan-Santini, 1972)
• Acanthonotozomoides oatesi (K.H. Barnard, 1930)
• Acanthonotozomoides sublitoralis Schellenberg, 1931
• Acanthonotozomopsis pushkini (Bushueva, 1978)
• Acanthoserolis polaris (Richardson, 1911)
• Acanthoserolis schythei (Lütken, 1858)
• Accalathura gigantissima Kussakin, 1967
• Acontiostoma marionis Stebbing, 1888
• Acontiostoma tuberculata Lowry & Stoddart, 1983
• Actinacanthus tricarinatus (Stebbing, 1883)
• Acutihumerus cavooreni (Bacescu & Absalao, 1985)
• Acutiserolis gerlachei (Monod, 1925)
• Acutiserolis johnstoni (Hale, 1952)
• Acutiserolis luethjei (Wägele, 1986)
• Acutiserolis margaretae (Menzies, 1962)
• Acutiserolis poorei Brandt, 2009
• Acutiserolis spinosa (Kussakin, 1967)
• Acutocoxae ogilvieae Horton, Ashford & Thurston in Ashford, Horton, Roterman, Thurston, Griffiths & Brandt, 2019
• Adeliella laticornis Nicholls, 1938
• Adeliella olivieri De Broyer, 1975
• Aega koltuni Kussakin, 1967 accepted as Aegiochus antarctica (Hodgson, 1910)
• Aega psora (Linnaeus, 1758)
• Aegaeon boschii (Christoffersen, 1988)
• Aeginoides gaussi Schellenberg, 1926
• Aegiochus antarctica (Hodgson, 1910)
• Aegiochus australis (Whitelegge, 1901)
• Aegiochus glacialis (Tattersall, 1921)
• Akanthinotanais gaussi (Vanhöffen, 1914)
• Akanthinotanais guillei (Shiino, 1978)
• Akanthophoreus antarcticus (Vanhöffen, 1914) accepted as Parakanthophoreus antarcticus (Vanhöffen, 1914)
• Akanthophoreus australis (Beddard, 1886) accepted as Parakanthophoreus antarcticus (Vanhöffen, 1914)
• Akanthophoreus weddellensis Sieg, 1986 accepted as Parakanthophoreus weddellensis (Sieg, 1986)
• Alamprops comatus (Zimmer, 1907)
• Alexandrella australis (Chilton, 1912)
• Alexandrella chione d'Udekem d'Acoz & Verheye, 2017
• Alexandrella dentata Chevreux, 1912
• Alexandrella inermis Bellan-Santini & Ledoyer, 1987
• Alexandrella mandibulata Berge & Vader, 2005
• Alexandrella martae Berge & Vader, 2005
• Alexandrella polarsterni (Berge & Vader, 2005)
• Alexandrella pulchra Ren in Ren & Huang, 1991
• Alexandrella schellenbergi (Holman & Watling, 1983)
• Alexandrella subchelata Holman & Watling, 1983
• Allodaposia abbreviata (Vanhöffen, 1914)
• Allogaussia galeata Schellenberg, 1926
• Allogaussia lobata K.H. Barnard, 1932 accepted as Orchomenella (Orchomenella) lobata (K.H. Barnard, 1932) represented as Orchomenella lobata (K.H. Barnard, 1932)
• Allogaussia navicula K.H. Barnard, 1932
• Allogaussia paradoxa Schellenberg, 1926
• Allorchestes compressa Dana, 1852
• Allorchestes novizealandiae Dana, 1852
• Allotanais hirsutus (Beddard, 1886)
• Amaryllis macrophthalma Haswell, 1879
• Amathillopsis charlottae Coleman, 1998
• Amathillopsis roroi Coleman & Coleman, 2008
• Ambasiopsis georgiensis K.H. Barnard, 1931
• Ambasiopsis tumicornis Nicholls, 1938
• Ambasiopsis uncinata K.H. Barnard, 1932
• Amblyops antarcticus O.S. Tattersall, 1955
• Amblyopsoides obtusa O.S. Tattersall, 1955
• Ampelisca antarctica Ren in Ren & Huang, 1991
• Ampelisca anversensis Karaman, 1975
• Ampelisca barnardi Nicholls, 1938
• Ampelisca bouvieri Chevreux, 1913
• Ampelisca bransfieldi K.H. Barnard, 1932
• Ampelisca composita Schellenberg, 1931
• Ampelisca dallenei Bellan-Santini, 1985
• Ampelisca dentifera Schellenberg, 1931
• Ampelisca gracilicauda Schellenberg, 1931
• Ampelisca hemicryptops K.H. Barnard, 1930
• Ampelisca lenaldei Bellan-Santini, 1985