Acanthopsis van Hasselt in Férussac, 1824 accepted as Cobitis Linnaeus, 1758 (habitat flag source)
Acanthopsole Trinchese, 1874 accepted as Facelina Alder & Hancock, 1855 (habitat flag source)
Achlyopa Whitley, 1947 accepted as Synaptura Cantor, 1849 (habitat flag source)
Actaeocina accepted as Acteocina Gray, 1847 (habitat flag source)
Actinerus accepted as Actinernus Verrill, 1879 (habitat flag source)
Actinomortierella T.V. Chalabuda, 1968 accepted as Mortierella E. Coemans, 1863 (habitat flag source)
Adamastor Bonaparte, 1856 accepted as Procellaria Linnaeus, 1758 (habitat flag source)
Aerops Reichenbach, 1851 accepted as Merops Linnaeus, 1758 (habitat flag source)
Aethocorys Sharpe, 1902 accepted as Spizocorys Sundevall, 1872 (habitat flag source)
Afribyx Mathews, 1913 accepted as Vanellus Brisson, 1760 (habitat flag source)
Aglaopheme Kinberg, 1866 accepted as Aglaophamus Kinberg, 1865 (habitat flag source)
Aglaopheme Kinberg, 1866 accepted as Aglaophamus Kinberg, 1865 (extant flag source)
Alaysiidae accepted as Siboglinidae Caullery, 1914 (habitat flag source)
Alexia Leach in Gray, 1847 accepted as Myosotella Monterosato, 1906 (habitat flag source)
Allarthonia A. Zahlbruckner in Engler & Prantl, 1903 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Allarthoniomyces E.A. Thomas, 1939 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Allarthotheliomyces Ciferri & Tomaselli, 1953 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Allarthothelium (Vainio) A. Zahlbruckner in Engler & Prantl, 1908 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Allorossia Grimpe, 1925 accepted as Rossia Owen, 1834 (habitat flag source)
Aloides Adams, 1856 accepted as Corbula Bruguière, 1797 (habitat flag source)
Alyxoria S.F. Gray, 1821 accepted as Opegrapha E. Acharius, 1809 (habitat flag source)
Amblygliphidodon accepted as Amblyglyphidodon Bleeker, 1877 (habitat flag source)
Ameropeltomyces Batista & H. Maia, 1967 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Amphicora Ehrenberg, 1836 accepted as Fabricia Blainville, 1828 (habitat flag source)
Amphictenidae accepted as Pectinariidae Quatrefages, 1866 (habitat flag source)
Amphipholus accepted as Amphipholis Ljungman, 1866 (habitat flag source)
Amphisile Cuvier, 1816 accepted as Centriscus Linnaeus, 1758 (habitat flag source)
Anarichas Ascanius, 1775 accepted as Anarhichas Linnaeus, 1758 (habitat flag source)
Anchovella accepted as Anchoviella Fowler, 1911 (habitat flag source)
Ancillaria Lamarck, 1811 accepted as Ancilla Lamarck, 1799 (habitat flag source)
Anthophysis J.B.G. Bory de St.-Vincent, 1822 accepted as Anthophysa Bory de Saint-Vincent, 1822 (habitat flag source)
Antionetta accepted as Antonietta Schmekel, 1966 (habitat flag source)
Antonbruuniidae Auct. accepted as Antonbruunidae Fauchald, 1977 (habitat flag source)
Aphya Agassiz, 1846 accepted as Aphia Risso, 1827 (habitat flag source)
Aplysiopterus Delle Chiaje, 1830 accepted as Elysia Risso, 1818 (habitat flag source)
Apodya Cornu, 1872 accepted as Leptomitus C.A. Agardh, 1824 (habitat flag source)
Apomatalos Uchida, 1978 accepted as Apomatolos Uchida, 1978 accepted as Rhodopsis Bush, 1905 (habitat flag source)
Apomatalos Uchida, 1978 accepted as Apomatolos Uchida, 1978 accepted as Rhodopsis Bush, 1905 (extant flag source)
Apoprionospio Foster, 1969 accepted as Prionospio Malmgren, 1867 (habitat flag source)
Apterodytes Ameghino, 1901 accepted as Aptenodytes Miller, 1778 (habitat flag source)
Arabellidae Hartman, 1944 accepted as Oenonidae Kinberg, 1865 (habitat flag source)
Archinomidae accepted as Amphinomidae Savigny in Lamarck, 1818 (habitat flag source)
Arctophoca Peters, 1866 accepted as Arctocephalus Cuvier, 1826 (habitat flag source)
Argyropelacus accepted as Argyropelecus Cocco, 1829 (habitat flag source)
Ariciidae accepted as Orbiniidae Hartman, 1942 (habitat flag source)
Arthessa Evans, 1950 accepted as Volvatella Pease, 1860 (habitat flag source)
Arthoniomyces E.A. Thomas ex Ciferri & Tomaselli, 1953 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Arthoniopsis J. Müller Arg., 1890 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Artotrogus Montagne in Berkeley, 1845 accepted as Pythium N. Pringsheim, 1858 (habitat flag source)
Arundinella L. Léger & Duboscq, 1905 accepted as Arundinula L. Léger & Duboscq, 1906 (habitat flag source)
Ascopodaria Allman, 1881 accepted as Barentsia Hincks, 1880 (habitat flag source)
Askonema Kent, 1870 accepted as Asconema Kent, 1870 (habitat flag source)
Aspergillum Lamarck, 1818 accepted as Brechites Guettard, 1770 (habitat flag source)
Aspidophorus accepted as Aspidiophorus Voigt, 1903 (habitat flag source)
Asplancha accepted as Asplanchna Gosse, 1850 (habitat flag source)
Asteria Linnaeus, 1767 accepted as Asterias Linnaeus, 1758 (habitat flag source)
Asterocystis De Wildeman, 1893 accepted as Olpidium (A. Braun) J. Schröter in Cohn, 1886 (habitat flag source)
Asterotrema J. Müller Arg., 1884 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Astomus Jouin, 1979 (habitat flag source)
Astrodisculus Greeff, 1869 accepted as Nuclearia Cienkowsky, 1865 (habitat flag source)
Atelopus Temminck & Schlegel, 1846 accepted as Ateleopus Temminck & Schlegel in Siebold, 1846 (habitat flag source)
Atydidae Thiele, 1925 accepted as Haminoeidae Pilsbry, 1895 (habitat flag source)
Aulaxinomyces Ciferri & Tomaselli, 1953 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Aurospira accepted as Aurospio Maciolek, 1981 (habitat flag source)
Awuka Er. Marcus, 1955 accepted as Jorunna Bergh, 1876 (habitat flag source)
Axhelia Milne Edwards & Haime, 1849 accepted as Madracis Milne Edwards & Haime, 1849 (habitat flag source)
Azygozygum C.G.C. Chesters, 1933 accepted as Mortierella E. Coemans, 1863 (habitat flag source)
Basipetospora G.T. Cole & W.B. Kendrick, 1968 (habitat flag source)
Batillepes accepted as Batillipes Richters, 1909 (habitat flag source)
Bdellostoma Müller, 1836 accepted as Eptatretus Cloquet, 1819 (habitat flag source)
Belonopterus Reichenbach, 1852 accepted as Vanellus Brisson, 1760 (habitat flag source)
Bicellariidae accepted as Bugulidae Gray, 1848 (habitat flag source)
Bofonaria accepted as Bufonaria Schumacher, 1817 (habitat flag source)
Bogueidae Hartman & Fauchald, 1971 accepted as Maldanidae Malmgren, 1867 (habitat flag source)
Bombylonax Heine, 1860 accepted as Merops Linnaeus, 1758 (habitat flag source)
Bougainvilla Hargitt, 1902 accepted as Bougainvillia Lesson, 1830 (habitat flag source)
Bougainvillea Forbes, 1848 accepted as Bougainvillia Lesson, 1830 (habitat flag source)
Bovichthys Richardson, 1844 accepted as Bovichtus Valenciennes in Cuvier & Valenciennes, 1832 (habitat flag source)
Bria de Gregorio, 1890 accepted as Gregorioiscala Cossmann, 1912 (habitat flag source)
Brochiella Krumbach, 1925 accepted as Manania James-Clark, 1863 (habitat flag source)
Bryostigma J. Poelt & P. Döbbeler, 1979 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Bryssetaeres Jordan & Evermann in Jordan, 1896 accepted as Gobiesox Lacepède, 1800 (habitat flag source)
Bulbometopon accepted as Bolbometopon Smith, 1956 (habitat flag source)
Buliminusidae accepted as Enidae Woodward, 1903 (habitat flag source)
Calamyzidae Hartmann-Schröder, 1971 accepted as Syllidae Grube, 1850 (habitat flag source)
Caldesia Trevisan, 1869 accepted as Arthonia E. Acharius, 1806 (habitat flag source)
Calendula Swainson, 1837 accepted as Galerida Boie, 1828 (habitat flag source)
Calliphylla accepted as Caliphylla A. Costa, 1867 (habitat flag source)
Calorhinus accepted as Callorhinus J.E. Gray, 1859 (habitat flag source)
Calvadosia James-Clark, 1863 (habitat flag source)
Calyptromyces H. Karsten, 1849 accepted as Mucor Fresenius, 1850 (habitat flag source)
Camptorynchus accepted as Camptorhynchus Bonaparte, 1838 (habitat flag source)
Cantherines Swainson, 1839 accepted as Cantherhines Swainson, 1839 (habitat flag source)
Canuellidae accepted as Cerioporidae Busk, 1859 (habitat flag source)
Caobangidae accepted as Sabellidae Latreille, 1825 (habitat flag source)
Capellina accepted as Eubranchus Forbes, 1838 (habitat flag source)
Capitita Hartman, 1947 (habitat flag source)
Capria Antipa, 1893 accepted as Lipkea Vogt, 1886 (habitat flag source)
Carcharinus accepted as Carcharhinus Blainville, 1816 (habitat flag source)
Carnoya A. Dewèvre, 1893 accepted as Mortierella E. Coemans, 1863 (habitat flag source)