Abietinaria Kirchenpauer, 1884 (additional source)
Acalyptophis peronii (Duméril, 1853) accepted as Hydrophis peronii (Duméril, 1853) (additional source)
Acanthogobius flavimanus (Temminck & Schlegel, 1845) (additional source)
Acanthus ebracteatus Vahl (additional source)
Acanthus ilicifolius L. (additional source)
Acartia (Acartia) danae Giesbrecht, 1889 (basis of record)
Acentrogobius pflaumii (Bleeker, 1853) (additional source)
Achnanthes brevipes C.Agardh, 1824 (additional source)
Achnanthes clevei Grunow, 1880 accepted as Karayevia clevei (Grunow) Round & Bukhtiyarova, 1999 (additional source)
Achnanthes hauckiana Grunow, 1880 (additional source)
Achnanthes inflata (Kützing) Grunow, 1867 (additional source)
Achnanthes minutissima Kützing, 1833 (additional source)
Acrochordus granulatus (Schneider, 1799) (additional source)
Acrostichum aureum L. (additional source)
Acrostichum speciosum Willd. (basis of record)
Actarjania splendens Hopper, 1967 accepted as Sabatieria splendens (Hopper, 1967) (additional source)
Actinocyclus curvatulus Janisch, 1874 (additional source)
Actinocyclus ehrenbergii Ralfs, 1861 (additional source)
Actinocyclus ingens Rattray, 1890 † (additional source)
Actinocyclus normanii (Gregory) Hustedt, 1957 (additional source)
Actinoptychus undulatus (J.W.Bailey) Ralfs, 1861 accepted as Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 accepted as Actinocyclus senarius Ehrenberg, 1838 (additional source)
Actitis hypoleucos (Linnaeus, 1758) (additional source)
Adercotryma glomeratum (Brady, 1878) (additional source)
Aegiceras corniculatum (L.) Blanco (basis of record)
Aegina citrea Eschscholtz, 1829 (additional source)
Aeginura grimaldii Maas, 1904 (additional source)
Aegisthus mucronatus Giesbrecht, 1891 (additional source)
Aequorea coerulescens (Brandt, 1835) (additional source)
Aetideopsis multiserrata (Wolfenden, 1904) (additional source)
Aetideus armatus (Boeck, 1873) (additional source)
Aetideus bradyi Scott A., 1909 (basis of record)
Agalma elegans (M. Sars, 1846) (additional source)
Aglaophamus macroura (Schmarda, 1861) (additional source)
Alacia hettacra (Müller, 1906) (additional source)
Alcyonidium mytili Dalyell, 1848 accepted as Alcyonidioides mytili (Dalyell, 1848) (additional source)
Alona rectangula G.O. Sars, 1862 accepted as Coronatella rectangula (G.O. Sars, 1862) (additional source)
Alteromonas Baumann et al., 1972 (basis of record)
Althoffia tumida Lohmann, 1892 (additional source)
Ambassis miops Günther, 1872 (additional source)
Amigdoscalpellum vitreum (Hoek, 1883) (additional source)
Ammobaculites agglutinans (d'Orbigny, 1846) (additional source)
Ammobaculites filiformis Earland, 1934 (additional source)
Ammolagena clavata (Jones & Parker, 1860) (additional source)
Amphicaryon acaule Chun, 1888 (additional source)
Amphicaryon ernesti Totton, 1954 (additional source)
Amphicaryon peltifera (Haeckel, 1888) (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphilectus fucorum (Esper, 1794) (additional source)
Amphiprora paludosa var. paludosa W. Smith, 1853 accepted as Entomoneis paludosa (W.Smith) Reimer, 1975 (additional source)
Amphitretus pelagicus Hoyle, 1885 (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Amphogona apicata Kramp, 1957 (additional source)
Amphora angusta Gregory, 1857 (additional source)
Amphora copulata (Kützing) Schoeman & R.E.M.Archibald, 1986 accepted as Frustulia copulata Kützing, 1833 (additional source)
Amphora delicatissima Krasske, 1930 (additional source)
Amphora ovalis (Kützing) Kützing, 1844 (additional source)
Ampithoe valida S.I. Smith, 1873 (additional source)
Anas acuta Linnaeus, 1758 (additional source)
Anas clypeata Linnaeus, 1758 accepted as Spatula clypeata (Linnaeus, 1758) (additional source)
Anas platyrhynchos Linnaeus, 1758 (additional source)
Anas querquedula Linnaeus, 1758 accepted as Spatula querquedula (Linnaeus, 1758) (additional source)
Anchylomera blossevillei H. Milne Edwards, 1830 (additional source)
Ancistrosyllis groenlandica McIntosh, 1878 (additional source)
Angulogerina angulosa (Williamson, 1858) accepted as Trifarina angulosa (Williamson, 1858) (additional source)
Annatiara affinis (Hartlaub, 1914) (additional source)
Anous stolidus (Linnaeus, 1758) (additional source)
Anthomastus Verrill, 1878 (additional source)
Anthoptilum grandiflorum (Verrill, 1879) (additional source)
Aphanothece saxicola Nägeli, 1849 (additional source)
Archescolecithrix auropecten (Giesbrecht, 1893) (additional source)
Ardea cinerea Linnaeus, 1758 (additional source)
Arenaria interpres (Linnaeus, 1758) (additional source)
Argyropelecus gigas Norman, 1930 (additional source)
Argyropelecus hemigymnus Cocco, 1829 (additional source)
Aricidea (Acmira) simplex Day, 1963 (additional source)
Aricidea (Allia) belgicae (Fauvel, 1936) accepted as Aricidea (Strelzovia) belgicae (Fauvel, 1936) (additional source)
Arietellus simplex Sars G.O., 1905 (additional source)
Artacama proboscidea Malmgren, 1866 (additional source)
Asteromphalus heptactis (Brébisson) Ralfs, 1861 (additional source)
Asteromphalus robustus Castracane, 1875 (additional source)
Asteronyx loveni Müller & Troschel, 1842 (additional source)
Astrammina rara Rhumbler, 1931 (additional source)
Astropecten polyacanthus Müller & Troschel, 1842 (additional source)
Astrotia stokesii (Gray, 1846) accepted as Hydrophis stokesii (Gray, 1846) (additional source)
Atolla wyvillei Haeckel, 1880 (additional source)
Augaptilus glacialis Sars G.O., 1900 (additional source)
Avicennia marina (Forssk.) Vierh. (additional source)
Avocettina infans (Günther, 1878) (additional source)
Balaenoptera acutorostrata Lacépède, 1804 (additional source)
Balaenoptera borealis Lesson, 1828 (additional source)
Balaenoptera musculus Van Beneden & Gervais, 1880 accepted as Balaenoptera physalus (Linnaeus, 1758) (additional source)
Balaenoptera physalus (Linnaeus, 1758) (additional source)
Bargmannia elongata Totton, 1954 (additional source)
Barringtonia asiatica (L.) Kurz. (basis of record)
Barringtonia racemosa (L.) Spreng. (basis of record)
Bassia bassensis (Quoy & Gaimard, 1833) (additional source)
Bathycalanus richardi Sars G.O., 1905 (additional source)
Bathyconchoecia lacunosa Müller G. W., 1906 (additional source)
Bathylagus argyrogaster Norman, 1930 accepted as Bathylagoides argyrogaster (Norman, 1930) (additional source)
Bathylagus ochotensis Schmidt, 1938 accepted as Lipolagus ochotensis (Schmidt, 1938) (additional source)