Abra fragilis Risso, 1826 accepted as Abra prismatica (Montagu, 1808) (source of synonymy)
Abra fragilis Risso, 1826 accepted as Abra prismatica (Montagu, 1808) (basis of record)
Abra fragilis Risso, 1826 accepted as Abra prismatica (Montagu, 1808) (extant flag source)
Abscondicola Fiers, 1990 (basis of record)
Acanthochaetes Leach in Risso, 1826 accepted as Acanthochitona Gray, 1821 (basis of record)
Acanthochaetes Leach in Risso, 1826 accepted as Acanthochitona Gray, 1821 (extant flag source)
Acanthochaetes Leach in Risso, 1826 accepted as Acanthochitona Gray, 1821 (source of synonymy)
Acanthochaetes vulgaris Leach, 1852 accepted as Acanthochitona crinita (Pennant, 1777) (basis of record)
Acanthochaetes vulgaris Leach, 1852 accepted as Acanthochitona crinita (Pennant, 1777) (extant flag source)
Acanthochaetes vulgaris Leach, 1852 accepted as Acanthochitona crinita (Pennant, 1777) (source of synonymy)
Acanthochites aeneus Risso, 1826 accepted as Acanthochitona discrepans (Brown, 1827) (extant flag source)
Acanthochites aeneus Risso, 1826 accepted as Acanthochitona discrepans (Brown, 1827) (source of synonymy)
Acanthochites aeneus Risso, 1826 accepted as Acanthochitona discrepans (Brown, 1827) (basis of record)
Acanthochites aeneus Di Monerosato, 1878 accepted as Acanthochitona gracilis (Jeffreys, 1859) accepted as Acanthochitona crinita (Pennant, 1777) (extant flag source)
Acanthochites aeneus Di Monerosato, 1878 accepted as Acanthochitona gracilis (Jeffreys, 1859) accepted as Acanthochitona crinita (Pennant, 1777) (basis of record)
Acanthochites aeneus Di Monerosato, 1878 accepted as Acanthochitona gracilis (Jeffreys, 1859) accepted as Acanthochitona crinita (Pennant, 1777) (source of synonymy)
Acanthochites carinatus Risso, 1826 accepted as Acanthochitona crinita (Pennant, 1777) (basis of record)
Acanthochites carinatus Risso, 1826 accepted as Acanthochitona crinita (Pennant, 1777) (extant flag source)
Acanthochites carinatus Risso, 1826 accepted as Acanthochitona crinita (Pennant, 1777) (source of synonymy)
Acanthochites communis Risso, 1826 accepted as Acanthochitona communis (Risso, 1826) (source of synonymy)
Acanthochites communis Risso, 1826 accepted as Acanthochitona communis (Risso, 1826) (basis of record)
Acanthochites communis Risso, 1826 accepted as Acanthochitona communis (Risso, 1826) (extant flag source)
Acanthochitona gracilis (Jeffreys, 1859) accepted as Acanthochitona crinita (Pennant, 1777) (basis of record)
Acanthochitona gracilis (Jeffreys, 1859) accepted as Acanthochitona crinita (Pennant, 1777) (source of synonymy)
Acanthochitona gracilis (Jeffreys, 1859) accepted as Acanthochitona crinita (Pennant, 1777) (extant flag source)
Acanthophyma Locket, Millidge & Merrett, 1974 (basis of record)
Acanthophyma Locket, Millidge & Merrett, 1974 (extant flag source)
Acanthophyma gowerensis (Lockett) (extant flag source)
Acanthophyma gowerensis (Lockett) (basis of record)
Acanthopleura hanleyi (Bean in Thorpe, 1844) accepted as Hanleya hanleyi (Bean in Thorpe, 1844) (source of synonymy)
Acanthopleura hanleyi (Bean in Thorpe, 1844) accepted as Hanleya hanleyi (Bean in Thorpe, 1844) (basis of record)
Acanthopleura hanleyi (Bean in Thorpe, 1844) accepted as Hanleya hanleyi (Bean in Thorpe, 1844) (extant flag source)
Acantopsis taenia (Linnaeus, 1758) accepted as Cobitis taenia Linnaeus, 1758 (source of synonymy)
Acantopsis taenia (Linnaeus, 1758) accepted as Cobitis taenia Linnaeus, 1758 (extant flag source)
Acantopsis taenia (Linnaeus, 1758) accepted as Cobitis taenia Linnaeus, 1758 (basis of record)
Acartia intermedia (Poppe, 1885) (extant flag source)
Acartia intermedia (Poppe, 1885) (basis of record)
Acartia macropus Cleve, 1900 (basis of record)
Acartia macropus Cleve, 1900 (extant flag source)
Acartia omorii Bradford, 1976 (basis of record)
Acartia omorii Bradford, 1976 (extant flag source)
Acerina schraetser (Linnaeus, 1758) (extant flag source)
Acerina schraetser (Linnaeus, 1758) (basis of record)
Achaeus cursor A. Milne-Edwards & Bouvier, 1898 accepted as Achaeus cranchii Leach, 1817 (source of synonymy)
Achaeus cursor A. Milne-Edwards & Bouvier, 1898 accepted as Achaeus cranchii Leach, 1817 (basis of record)
Achaeus cursor A. Milne-Edwards & Bouvier, 1898 accepted as Achaeus cranchii Leach, 1817 (extant flag source)
Achelia hispida Hodge, 1864 (basis of record)
Achelia hispida Hodge, 1864 (extant flag source)
Achelia uni-unguiculata Dohrn, 1881 (basis of record)
Achelia uni-unguiculata Dohrn, 1881 (extant flag source)
Achlyonice ecalcarea Théel, 1879 (extant flag source)
Achlyonice ecalcarea Théel, 1879 (basis of record)
Acineta compressa Claparède & Lachmann, 1859 (extant flag source)
Acineta compressa Claparède & Lachmann, 1859 (basis of record)
Acineta tuberosa Ehrenberg, 1833 (basis of record)
Acineta tuberosa Ehrenberg, 1833 (extant flag source)
Aclis supranitida (S.V. Wood, 1842) accepted as Aclis minor (Brown, 1827) (source of synonymy)
Aclis supranitida (S.V. Wood, 1842) accepted as Aclis minor (Brown, 1827) (extant flag source)
Aclis supranitida (S.V. Wood, 1842) accepted as Aclis minor (Brown, 1827) (basis of record)
Acrorhynchides hermaphroditus Ehrenberg, 1831 (extant flag source)
Acrorhynchides hermaphroditus Ehrenberg, 1831 (basis of record)
Actaletes Giard, 1889 (basis of record)
Actaletes Giard, 1889 (extant flag source)
Actaletes neptuni Giard, 1889 (basis of record)
Actaletes neptuni Giard, 1889 (extant flag source)
Actaletidae (extant flag source)
Actaletidae (basis of record)
Actidium coarctatum (Haliday) (extant flag source)
Actidium coarctatum (Haliday) (basis of record)
Actigia pusilla (Gaertner, 1774) accepted as Coryne pusilla (Gaertner, 1774) (basis of record)
Actigia pusilla (Gaertner, 1774) accepted as Coryne pusilla (Gaertner, 1774) (extant flag source)
Actigia pusilla (Gaertner, 1774) accepted as Coryne pusilla (Gaertner, 1774) (source of synonymy)
Actinia candida Müller, 1776 (basis of record)
Actinia candida Müller, 1776 (extant flag source)
Actinia dolichurum Pallas, 1766 accepted as Pentacta dolichurum (Pallas, 1766) (source of synonymy)
Actinia dolichurum Pallas, 1766 accepted as Pentacta dolichurum (Pallas, 1766) (basis of record)
Actinia dolichurum Pallas, 1766 accepted as Pentacta dolichurum (Pallas, 1766) (extant flag source)
Actinia effoeta (extant flag source)
Actinia effoeta (basis of record)
Actinia plumosa (extant flag source)
Actinia plumosa (basis of record)
Actinoptychus octonarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus octonarius Ehrenberg, 1837 (source of synonymy)
Actinoptychus octonarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus octonarius Ehrenberg, 1837 (basis of record)
Actinoptychus octonarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus octonarius Ehrenberg, 1837 (extant flag source)
Actinothoe laceratus (Dalyell, 1848) accepted as Sagartiogeton laceratus (Dalyell, 1848) (basis of record)
Actinothoe laceratus (Dalyell, 1848) accepted as Sagartiogeton laceratus (Dalyell, 1848) (extant flag source)
Actinothoe laceratus (Dalyell, 1848) accepted as Sagartiogeton laceratus (Dalyell, 1848) (source of synonymy)
Adenopleurella Huys, 1990 (basis of record)
Adocia simulans (Johnston, 1842) accepted as Haliclona simulans (Johnston, 1842) (source of synonymy)
Adocia simulans (Johnston, 1842) accepted as Haliclona simulans (Johnston, 1842) (basis of record)
Adocia simulans (Johnston, 1842) accepted as Haliclona simulans (Johnston, 1842) (extant flag source)
Aedes caspius (Pallas, 1771) (habitat flag source)
Aedes detritus (Haliday, 1833) (habitat flag source)
Aedes dorsalis (Meigen, 1830) (basis of record)
Aedes dorsalis (Meigen, 1830) (extant flag source)
Aegialia arenaria (Fabricius, 1787) (habitat flag source)
Aeolidia verrucosa M. Sars, 1829 accepted as Coryphella verrucosa (M. Sars, 1829) accepted as Flabellina verrucosa (M. Sars, 1829) (source of synonymy)
Aeolidia verrucosa M. Sars, 1829 accepted as Coryphella verrucosa (M. Sars, 1829) accepted as Flabellina verrucosa (M. Sars, 1829) (extant flag source)
Aeolidia verrucosa M. Sars, 1829 accepted as Coryphella verrucosa (M. Sars, 1829) accepted as Flabellina verrucosa (M. Sars, 1829) (basis of record)
Aeolis Oken, 1815 accepted as Aeolidia Cuvier, 1798 (basis of record)