Abergasilus amplexus Hewitt, 1978 (additional source)
Abyssophilos ktis Jellinek & Swanson, 2003 (additional source)
Abyssorchomene abyssorum (Stebbing, 1888) (additional source)
Acanthephyra brevirostris Smith, 1885 (additional source)
Acanthephyra eximia Smith, 1884 (additional source)
Acanthephyra pelagica (Risso, 1816) (additional source)
Acanthephyra quadrispinosa Kemp, 1939 (additional source)
Acanthephyra smithi Kemp, 1939 (additional source)
Acanthochondria incisa Shiino, 1955 (additional source)
Acanthocolax Vervoort, 1969 (additional source)
Acanthocyclops robustus (Sars G.O., 1863) represented as Acanthocyclops robustus robustus (Sars G.O., 1863) (additional source)
Acanthocyclops vernalis (Fischer, 1853) represented as Acanthocyclops vernalis vernalis (Fischer, 1853) (additional source)
Acanthomunna proteus Beddard, 1886 (additional source)
Acanthoscina acanthodes (Stebbing, 1895) (additional source)
Acartia danae Giesbrecht, 1889 represented as Acartia (Acartia) danae Giesbrecht, 1889 (additional source)
Acartia ensifera Brady, 1899 represented as Acartia (Acartiura) ensifera Brady, 1899 (additional source)
Acartia jilletti Bradford, 1976 represented as Acartia (Acartiura) jilletti Bradford, 1976 (additional source)
Acartia negligens Dana, 1849-1852 represented as Acartia (Acartia) negligens Dana, 1849-1852 (additional source)
Acartia simplex Sars G.O., 1905 represented as Acartia (Acartiura) simplex Sars G.O., 1905 (additional source)
Acasta Leach, 1817 (additional source)
Achaeus akanensis Sakai, 1938 (basis of record)
Achaeus curvirostris (A. Milne-Edwards, 1873) (additional source)
Achaeus kermadecensis Webber & Takeda, 2005 (additional source)
Acheronia pegasus Lowry, 1984 (basis of record)
Acontiostoma marionis Stebbing, 1888 (additional source)
Acontiostoma tuberculata Lowry & Stoddart, 1983 (basis of record)
Actaeomorpha erosa Miers, 1877 (additional source)
Actumnus griffini Takeda & Webber, 2006 (basis of record)
Acutigebia danai (Miers, 1876) (additional source)
Acutiserolis Brandt, 1988 (additional source)
Aega Leach, 1816 (additional source)
Aega falklandica Kussakin, 1967 (additional source)
Aega komai Bruce, 1996 (additional source)
Aega monophthalma Johnston, 1834 (additional source)
Aega semicarinata Miers, 1875 (additional source)
Aega stevelowei Bruce, 2009 (additional source)
Aega urotoma Barnard, 1914 (additional source)
Aegaeon lacazei (Gourret, 1887) (additional source)
Aegapheles alazon (Bruce, 2004) (additional source)
Aegapheles birubi (Bruce, 2004) (additional source)
Aegapheles copidis Bruce, 2009 (additional source)
Aegapheles hamiota (Bruce, 2004) (additional source)
Aegapheles mahana Bruce, 2009 (additional source)
Aegapheles rickbruscai (Bruce, 2004) (additional source)
Aegapheles umpara (Bruce, 2004) (additional source)
Aegiochus coroo (Bruce, 1983) (additional source)
Aegiochus gordoni Bruce, 2009 (additional source)
Aegiochus insomnis Bruce, 2009 (additional source)
Aegiochus kakai Bruce, 2009 (additional source)
Aegiochus kanohi Bruce, 2009 (additional source)
Aegiochus laevis (Studer, 1884) (additional source)
Aegiochus nohinohi Bruce, 2009 (additional source)
Aegiochus piihuka Bruce, 2009 (additional source)
Aegiochus riwha Bruce, 2009 (additional source)
Aegiochus tara Bruce, 2009 accepted as Aegiochus gracilipes (Hansen, 1895) (additional source)
Aegiochus vigilans (Haswell, 1881) (additional source)
Aegisthus mucronatus Giesbrecht, 1891 (additional source)
Aethon garricki Hewitt, 1968 (additional source)
Aethon morelandi Hewitt, 1968 (additional source)
Aethon percis (Thomson G.M., 1890) (additional source)
Aetideopsis tumorosa Bradford, 1969 (additional source)
Aetideus acutus Farran, 1929 (additional source)
Aetideus australis (Vervoort, 1957) (additional source)
Aetideus giesbrechti Cleve, 1904 (additional source)
Aetideus pseudarmatus Bradford, 1971 (basis of record)
Afrolaophonte Chappuis, 1960 (additional source)
Agathotanais spinipoda Larsen, 1999 (additional source)
Agononida incerta (Henderson, 1888) (additional source)
Agononida marini (Macpherson, 1994) (additional source)
Alainius Baba, 1991 (additional source)
Alainopasiphaea australis (Hanamura, 1989) (additional source)
Albanthura rotunduropus Wägele, 1985 (additional source)
Albanthura stenodactyla Wägele, 1985 (additional source)
Albionella Kabata, 1979 accepted as Neoalbionella Özdikmen, 2008 (additional source)
Albunea microps Miers, 1878 (additional source)
Alcockianum persona (Annandale, 1916) (basis of record)
Alepas pacifica Pilsbry, 1907 (basis of record)
Alexandrella mixta (Nicholls, 1938) (additional source)
Allodiastylis acanthanasillos Gerken, 2001 (additional source)
Allogalathea elegans (Adams, 1847) (additional source)
Allorchestes compressa Dana, 1852 (additional source)
Allorostrata Winkler, 1994 (additional source)
Alope spinifrons (H. Milne Edwards, 1837) (additional source)
Alpheopsis garricki Yaldwyn, 1971 (additional source)
Alpheus hailstonei Coutière, 1905 (additional source)
Alpheus novaezealandiae Miers, 1876 (additional source)
Alpheus socialis Heller, 1862 (additional source)
Alteutha depressa (Baird, 1837) (additional source)
Alteutha novaezealandiae (Brady, 1899) (additional source)
Alteuthoides kootare Hicks, 1986 (additional source)
Altiverruca galapagosa Zevina, 1987 (basis of record)
Altiverruca gibbosa (Hoek, 1883) (additional source)
Altiverruca nitida (Hoek, 1883) (basis of record)
Alvinocaris alexander Ahyong, 2009 accepted as Alvinocaris dissimilis Komai & Segonzac, 2005 (additional source)
Alvinocaris longirostris Kikuchi & Ohta, 1995 (additional source)
Alvinocaris niwa Webber, 2004 (additional source)
Amallothrix arcuata (Sars G.O., 1920) (additional source)
Amallothrix dentipes (Vervoort, 1951) (additional source)
Amallothrix emarginata (Farran, 1905) accepted as Pseudoamallothrix emarginata (Farran, 1905) (additional source)
Amallothrix gracilis (Sars G.O., 1905) (additional source)