Acanthodoris pilosa (Abildgaard, 1789) (additional source)
Achnanthes longipes C.Agardh, 1824 (basis of record)
Achnanthes subsessilis Kützing, 1833 accepted as Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 accepted as Achnanthes intermedia Kützing, 1833 (basis of record)
Actinocyclus normanii f. subsalsus (Juhlin-Dannfelt) Hustedt (basis of record)
Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 accepted as Actinocyclus senarius Ehrenberg, 1838 (additional source)
Actinostola callosa (Verrill, 1882) (additional source)
Actitis macularius Linnaeus, 1766 (additional source)
Aega psora (Linnaeus, 1758) (additional source)
Aequorea albida A. Agassiz, 1862 (additional source)
Aetea anguina (Linnaeus, 1758) (additional source)
Agalma elegans (M. Sars, 1846) (additional source)
Agarum clathratum Dumortier, 1822 (basis of record)
Ahnfeltia plicata (Hudson) E.M.Fries, 1836 (additional source)
Aix sponsa (Linnaeus, 1758) (additional source)
Alaria esculenta (Linnaeus) Greville, 1830 (additional source)
Alca torda Linnaeus, 1758 (additional source)
Alcyonidium polyoum (Hassall, 1841) (additional source)
Alcyonium digitatum Linnaeus, 1758 (additional source)
Alle alle (Linnaeus, 1758) (additional source)
Alvania areolata (W. Stimpson, 1851) accepted as Tachyrhynchus reticulatus (Mighels & C. B. Adams, 1842) (additional source)
Alvania exarata (W. Stimpson, 1851) accepted as Onoba exarata (W. Stimpson, 1851) accepted as Onoba mighelsii (W. Stimpson, 1851) (additional source)
Amaroucium glabrum Verrill, 1871 accepted as Aplidium glabrum (Verrill, 1871) (additional source)
Amaroucium pallidum Verrill, 1871 accepted as Aplidium pallidum (Verrill, 1871) (additional source)
Amaroucium spitzbergense (Hartmeyer, 1903) accepted as Aplidium spitzbergense Hartmeyer, 1903 (additional source)
Amaroucium stellatum Verrill, 1871 accepted as Aplidium stellatum (Verrill, 1871) (additional source)
Ameira curviseta Willey, 1929 (basis of record)
Ammodramus caudacutus (Gmelin, 1788) (additional source)
Ammodramus maritimus (Wilson, 1811) (additional source)
Ampharete acutifrons (Grube, 1860) (additional source)
Amphilectus lobata (Montagu, 1814) accepted as Amphilectus ovulum (Schmidt, 1870) (additional source)
Amphipholis squamata (Delle Chiaje, 1828) (additional source)
Amphiporeia lawrenciana Shoemaker, 1929 (additional source)
Amphiporus angulatus (Müller, 1774) (additional source)
Amphiporus bioculatus sensu Verrill, 1892 (additional source)
Amphiporus caecus Verrill, 1892 (additional source)
Amphiporus frontalis Verrill, 1892 (additional source)
Amphiporus groenlandicus Örsted, 1843 (additional source)
Amphiporus ochraceus (Verrill, 1873) (additional source)
Amphitrite johnstoni Malmgren, 1866 accepted as Neoamphitrite figulus (Dalyell, 1853) (additional source)
Anas acuta Linnaeus, 1758 (additional source)
Anas americana Gmelin, 1789 (additional source)
Anas clypeata Linnaeus, 1758 accepted as Spatula clypeata (Linnaeus, 1758) (additional source)
Anas crecca carolinensis Gmelin, 1789 accepted as Anas carolinensis Gmelin, 1789 (additional source)
Anas discors Linnaeus, 1766 accepted as Spatula discors (Linnaeus, 1766) (additional source)
Anas penelope Linnaeus, 1758 accepted as Mareca penelope (Linnaeus, 1758) (additional source)
Anas platyrhynchos Linnaeus, 1758 (additional source)
Anas rubripes Brewster, 1902 (additional source)
Anas strepera Linnaeus, 1758 (additional source)
Anobothrus gracilis (Malmgren, 1866) (additional source)
Anomia aculeata O. F. Müller, 1776 accepted as Heteranomia squamula (Linnaeus, 1758) (additional source)
Anomia simplex A. d'Orbigny, 1853 (additional source)
Aporrhais occidentalis (H. Beck, 1836) accepted as Arrhoges occidentalis (H. Beck, 1836) (additional source)
Ardea alba Linnaeus, 1758 (additional source)
Ardea herodias Linnaeus, 1758 (additional source)
Arenaria interpres (Linnaeus, 1758) (additional source)
Ascidia callosa Stimpson, 1852 (additional source)
Ascophyllum nodosum (Linnaeus) Le Jolis, 1863 (additional source)
Astarte borealis (Schumacher, 1817) accepted as Tridonta borealis Schumacher, 1817 (additional source)
Astarte castanea (Say, 1822) accepted as Isocrassina castanea (Say, 1822) (additional source)
Astarte undata A. Gould, 1841 (additional source)
Asterias forbesi (Desor, 1848) (additional source)
Asterionella japonica Cleve, 1882 (additional source)
Astyris rosacea (A. Gould, 1840) (additional source)
Aulactinia stella (Verrill, 1864) (additional source)
Aurelia aurita (Linnaeus, 1758) (additional source)
Aurelia limbata Brandt, 1835 (additional source)
Aythya affinis (Eyton, 1838) (additional source)
Aythya americana (Eyton, 1838) (additional source)
Aythya collaris (Donovan, 1809) (additional source)
Aythya marila (Linnaeus, 1761) (additional source)
Aythya valisineria (Wilson, 1814) (additional source)
Bacillaria paxillifer (O.F.Müller) T.Marsson, 1901 accepted as Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 (additional source)
Balaenoptera acutorostrata Lacépède, 1804 (additional source)
Balaenoptera borealis Lesson, 1828 (additional source)
Biddulphia alternans (Bailey) Van Heurck, 1885 accepted as Trigonium alternans (Bailey) A.Mann, 1907 accepted as Triceratium alternans f. alternans J.W. Bailey, 1851 (additional source)
Biddulphia pulchella S.F.Gray, 1821 accepted as Biddulphia biddulphiana (J.E.Smith) Boyer, 1900 (additional source)
Blidingia marginata (J.Agardh) P.J.L.Dangeard ex Bliding, 1963 (additional source)
Blidingia minima (Nägeli ex Kützing) Kylin, 1947 (additional source)
Bolinopsis infundibulum (O.F. Müller, 1776) (additional source)
Boltenia echinata (Linnaeus, 1767) (additional source)
Boltenia ovifera (Linnaeus, 1767) (additional source)
Bopyroides hippolytes (Kröyer, 1838) (additional source)
Boreocingula castanea (Møller, 1842) (additional source)
Boreotrophon clathratus (Linnaeus, 1767) (additional source)
Boreotrophon truncatus (Strøm, 1768) (additional source)
Bostrichobranchus pilularis (Verrill, 1871) (additional source)
Botaurus lentiginosus (Rackett, 1813) (additional source)
Botryllus schlosseri (Pallas, 1766) (additional source)
Bougainvillia superciliaris (L. Agassiz, 1849) (additional source)
Branta bernicla (Linnaeus, 1758) (additional source)
Branta canadensis (Linnaeus, 1758) (additional source)
Brebissonia boeckii (Ehrenberg) E.O'Meara, 1875 accepted as Cocconema boeckii Ehrenberg, 1838 (basis of record)
Buccinum tottenii W. Stimpson, 1865 (additional source)
Bucephala albeola (Linnaeus, 1758) (additional source)
Bucephala clangula (Linnaeus, 1758) (additional source)
Bucephala islandica (Gmelin, 1789) (additional source)
Bugula simplex Hincks, 1886 accepted as Bugulina simplex (Hincks, 1886) (additional source)
Bugula turrita (Desor, 1848) accepted as Crisularia turrita (Desor, 1848) (additional source)
Butorides virescens (Linnaeus, 1758) (additional source)
Caberea ellisii (Fleming, 1814) (additional source)