Acanthaspidia Stebbing, 1893 accepted as Iolanthe Beddard, 1886 (additional source)
Acanthaspidia decorata (Hansen, 1895) accepted as Iolanthe decorata Hansen, 1895 (additional source)
Acanthaspidia laevis Chardy, 1975 accepted as Iolanthe laevis (Chardy, 1975) (additional source)
Acanthaspidia typhlops (G. O. Sars, 1879) accepted as Iolanthe typhlops (G. O. Sars, 1879) (additional source)
Acanthaspidiidae Menzies, 1962 (additional source)
Acanthocope Beddard, 1885 (additional source)
Acanthocope annulatus Menzies, 1962 (additional source)
Acanthocope armata Chardy, 1972 (additional source)
Acanthocope carinata Chardy, 1972 (additional source)
Acanthomunna Beddard, 1886 (additional source)
Acanthomunna hystrix (Hansen, 1916) (additional source)
Acrobelione Bourdon, 1981 (additional source)
Acrobelione reverberii (Restivo, 1970) (additional source)
Aega Leach, 1816 (additional source)
Aega affinis Milne Edwards, 1840 (additional source)
Aega bicarinata Leach, 1818 (additional source)
Aega crenulata Lutken, 1859 (additional source)
Aega emarginata Leach, 1818 accepted as Aega psora (Linnaeus, 1758) (additional source)
Aega hirsuta Schioedte & Meinert, 1879 (additional source)
Aega megalops Norman & Stebbing, 1886 (additional source)
Aega microphthalma Dana, 1853 (additional source)
Aega monophthalma Johnston, 1834 (additional source)
Aega psora (Linnaeus, 1758) (additional source)
Aega rosacea (Risso, 1816) (additional source)
Aega stroemii Lutken, 1859 (additional source)
Aega tridens Leach, 1816 (additional source)
Aega webbii (Guérin-Méneville, 1836) (basis of record)
Aegapheles deshaysiana (H. Milne Edwards, 1840) (additional source)
Aegidae White, 1850 (additional source)
Aegiochus Bovallius, 1885 (basis of record)
Aegiochus arctica (Lütken, 1859) (additional source)
Aegiochus gracilipes (Hansen, 1895) (additional source)
Aegiochus incisa (Schioedte & Meinert, 1879) (additional source)
Aegiochus ventrosa (M. Sars, 1859) (additional source)
Alitropus H. Milne Edwards, 1840 (additional source)
Alitropus foveolatus Schiödte & Meinert, 1879 accepted as Alitropus typus H. Milne Edwards, 1840 (additional source)
Amakusanthura Nunomura, 1977 (additional source)
Amakusanthura iberica Reboreda & Wägele, 1992 (additional source)
Amakusanthura libyana (Negoescu, 1980) (basis of record)
Amuletta Wilson & Thistle, 1985 (additional source)
Amuletta abyssorum (Richardson, 1911) (additional source)
Ananthura Barnard, 1925 (additional source)
Ananthura abyssorum (Norman & Stebbing, 1886) (additional source)
Ananthura ovalis Barnard, 1925 (additional source)
Ananthura sulcaticauda Barnard, 1925 (additional source)
Ancinidae Dana, 1852 (basis of record)
Ancyroniscus Caullery & Mesnil, 1919 (additional source)
Ancyroniscus bonnieri Caullery & Mesnil, 1919 (additional source)
Androniscus Verhoeff, 1908 (additional source)
Androniscus roseus (C. Koch, 1838) (additional source)
Angeliera Chappuis & Delamare-Deboutteville, 1952 (basis of record)
Angeliera phreaticola Chappuis & Delamare-Deboutteville, 1952 represented as Angeliera phreaticola phreaticola Chappuis & Delamare-Deboutteville, 1952 (basis of record)
Angeliera phreaticola phreaticola Chappuis & Delamare-Deboutteville, 1952 (basis of record)
Anilocra Leach, 1818 (basis of record)
Anilocra frontalis H. Milne Edwards, 1840 (additional source)
Anisarthrus Giard, 1907 (additional source)
Anisarthrus pelseneeri Giard, 1907 (additional source)
Antarcturidae Poore, 2001 (basis of record)
Antennuloniscus Menzies, 1962 (additional source)
Antennuloniscus dilatatus Chardy, 1974 (additional source)
Antennuloniscus diversus Lincoln, 1985 (additional source)
Antennuloniscus simplex Lincoln, 1985 (additional source)
Anthelura Norman & Stebbing, 1886 (additional source)
Anthelura elongata Norman & Stebbing, 1886 (additional source)
Antheluridae Poore & Lew Ton, 1988 (additional source)
Anthura Leach, 1814 (additional source)
Anthura gracilis (Montagu, 1808) (additional source)
Anthuridae Leach, 1814 (additional source)
Anthuridea accepted as Anthuroidea Leach, 1814 (basis of record)
Apanthura Stebbing, 1900 (additional source)
Apanthura corsica Amar, 1953 (additional source)
Apanthura tyrrhenica Wägele, 1980 (additional source)
Apanthuroides Menzies & Glynn, 1968 (additional source)
Apanthuroides mediterranea (Negoescu, 1981) (additional source)
Apanthuroides spathulicauda (Wägele, 1981) (additional source)
Arcturella G. O. Sars, 1897 accepted as Astacilla Cordiner, 1793 (additional source)
Arcturella carlosteroi Reboreda, Wägele & Garmendia, 1994 accepted as Astacilla carlosteroi (Reboreda, Wägele & Garmendia, 1994) (additional source)
Arcturella cornuta Koehler, 1911 accepted as Astacilla cornuta (Koehler, 1911) (additional source)
Arcturella damnoniensis (Stebbing, 1874) accepted as Astacilla damnoniensis (Stebbing, 1874) (additional source)
Arcturella dilatata (G. O. Sars, 1883) accepted as Astacilla dilatata G. O. Sars, 1883 (additional source)
Arcturella dollfusi Monod, 1925 accepted as Astacilla dollfusi (Monod, 1925) (additional source)
Arcturella poorei Castelló, 1997 accepted as Astacilla poorei (Castelló, 1997) (additional source)
Arcturidae Dana, 1849 (additional source)
Arcturinella Poisson & Maury, 1931 (additional source)
Arcturinella banyulensis Poisson & Maury, 1931 (additional source)
Arcturopsis Koehler, 1911 (additional source)
Arcturopsis giardi (Bonnier, 1896) (additional source)
Arcturus Latreille, 1829 (additional source)
Arcturus baffini (Sabine, 1824) (additional source)
Arcturus scabrosus Norman, 1904 (additional source)
Armadillidae Brandt in Brandt & Ratzeburg, 1831 (basis of record)
Armadillidiidae Brandt, 1833 (basis of record)
Armadillidium Brandt in Brandt & Ratzeburg, 1831 (basis of record)
Armadillidium album Dollfus, 1887 (additional source)
Armadillidium vulgare (Latreille, 1804) (basis of record)
Armadilloniscus Uljanin, 1875 (basis of record)
Armadilloniscus ellipticus (Harger, 1878) (basis of record)
Armadilloniscus litoralis Budde-Lund, 1885 accepted as Armadilloniscus ellipticus (Harger, 1878) (basis of record)
Asellidae Latreille, 1802 (additional source)
Asellota (basis of record)