Ablennes hians (Valenciennes, 1846) (additional source)
Abyla trigona Quoy & Gaimard, 1827 (additional source)
Abylopsis eschscholtzii (Huxley, 1859) (additional source)
Abylopsis tetragona (Otto, 1823) (additional source)
Acanthephyra curtirostris Wood-Mason in Wood-Mason & Alcock, 1891 (additional source)
Acanthocybium solandri (Cuvier, 1832) (additional source)
Acanthoscina acanthodes (Stebbing, 1895) (additional source)
Acanthurus xanthopterus Valenciennes, 1835 (additional source)
Acartia (Acartia) danae Giesbrecht, 1889 (basis of record)
Acartia (Acartia) negligens Dana, 1849-1852 (basis of record)
Acartia (Odontacartia) erythraea Giesbrecht, 1889 represented as Acartia (Odontacartia) erythraea erythraea Giesbrecht, 1889 (basis of record)
Acharax johnsoni (Dall, 1891) (additional source)
Achnanthes brevipes C.Agardh, 1824 (additional source)
Achnanthes longipes C.Agardh, 1824 (additional source)
Acrocalanus gracilis Giesbrecht, 1888 (additional source)
Acrocalanus monachus Giesbrecht, 1888 (additional source)
Actinocyclus curvatulus Janisch, 1874 (additional source)
Actinoptychus splendens (Shadbolt) Ralfs ex Pritchard, 1861 (additional source)
Aeginura grimaldii Maas, 1904 (additional source)
Aequorea coerulescens (Brandt, 1835) (additional source)
Aequorea macrodactyla (Brandt, 1835) (additional source)
Aetea anguina (Linnaeus, 1758) (additional source)
Aetea truncata (Landsborough, 1852) (additional source)
Aetideus armatus (Boeck, 1873) (additional source)
Aetideus bradyi Scott A., 1909 (basis of record)
Aetideus giesbrechti Cleve, 1904 (additional source)
Aeverrillia setigera (Hincks, 1887) (additional source)
Agalma elegans (M. Sars, 1846) (additional source)
Aglaophamus macroura (Schmarda, 1861) (additional source)
Aglaophenia Lamouroux, 1812 (additional source)
Aglaura hemistoma Péron & Lesueur, 1810 (additional source)
Ahnfeltiopsis flabelliformis (Harvey) Masuda, 1993 (additional source)
Ahnfeltiopsis pygmaea (J.Agardh) P.C.Silva & DeCew, 1992 (additional source)
Aidanosagitta neglecta (Aida, 1897) (additional source)
Aidanosagitta regularis (Aida, 1897) (additional source)
Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000 (additional source)
Alectis ciliaris (Bloch, 1787) (additional source)
Alepisaurus ferox Lowe, 1833 (additional source)
Algirosphaera robusta (Lohmann) R.E.Norris, 1984 (additional source)
Alopias pelagicus Nakamura, 1935 (additional source)
Alopias superciliosus Lowe, 1841 (additional source)
Alopias vulpinus (Bonnaterre, 1788) (additional source)
Alpheus sulcatus Kingsley, 1878 (additional source)
Aluterus monoceros (Linnaeus, 1758) (additional source)
Aluterus scriptus (Osbeck, 1765) (additional source)
Amphipholis squamata (Delle Chiaje, 1828) (additional source)
Amphisolenia bidentata B.Schröder, 1900 (additional source)
Amphisolenia globifera F.Stein, 1883 (additional source)
Amphisolenia palaeotheroides Kofoid, 1907 (additional source)
Amphisolenia rectangulata Kofoid, 1907 (additional source)
Amphisolenia schauinslandii Lemmermann, 1899 (additional source)
Amphisolenia thrinax F.Schütt, 1893 (additional source)
Amphithyrus sculpturatus Claus, 1879 (additional source)
Amphogona apicata Kramp, 1957 (additional source)
Amphogona apsteini (Vanhöffen, 1902) (additional source)
Amphora hyalina Kützing, 1844 accepted as Halamphora hyalina (Kützing) Rimet & R. Jahn in Rimet et al., 2018 (additional source)
Amphorellopsis acuta (Schmidt, 1902) (additional source)
Amphorides amphora (Claparède & Lachmann, 1858) (additional source)
Antigonia capros Lowe, 1843 (additional source)
Antigonia rubescens (Günther, 1860) (additional source)
Antropora tincta (Hastings, 1930) accepted as Akatopora tincta (Hastings, 1930) (additional source)
Archescolecithrix auropecten (Giesbrecht, 1893) (additional source)
Archiconchoecia striata Müller G. W., 1894 (additional source)
Arenicola brasiliensis Nonato, 1958 (additional source)
Argonauta argo Linnaeus, 1758 (additional source)
Argonauta hians [Lightfoot], 1786 (additional source)
Argyropelecus affinis Garman, 1899 (additional source)
Arothron hispidus (Linnaeus, 1758) (additional source)
Arothron meleagris (Anonymous, 1798) (additional source)
Asterionella glacialis Castracane, 1886 (additional source)
Asterionella japonica Cleve, 1882 (additional source)
Asteromphalus flabellatus (Brébisson) Greville, 1859 (additional source)
Asteromphalus heptactis (Brébisson) Ralfs, 1861 (additional source)
Asteromphalus robustus Castracane, 1875 (additional source)
Athorybia rosacea (Forsskål, 1775) (additional source)
Atlanta helicinoides Souleyet, 1852 accepted as Atlanta helicinoidea J. E. Gray, 1850 (additional source)
Atlanta inclinata J. E. Gray, 1850 (basis of record)
Atlanta turriculata A. d'Orbigny, 1836 (additional source)
Atolla wyvillei Haeckel, 1880 (additional source)
Aulostomus chinensis (Linnaeus, 1766) (additional source)
Automate dolichognatha De Man, 1888 (additional source)
Auxis rochei (Risso, 1810) (additional source)
Auxis thazard (Lacepède, 1800) (additional source)
Bacteriastrum delicatulum Cleve, 1897 (additional source)
Balaenoptera borealis Lesson, 1828 (additional source)
Balaenoptera physalus (Linnaeus, 1758) (additional source)
Bangia fuscopurpurea (Dillwyn) Lyngbye, 1819 (additional source)
Barbourisia rufa Parr, 1945 (additional source)
Barentsia discreta (Busk, 1886) (additional source)
Bassia bassensis (Quoy & Gaimard, 1833) (additional source)
Bathyplotes moseleyi (Théel, 1886) (additional source)
Bathypterois atricolor Alcock, 1896 (additional source)
Benthodesmus tenuis (Günther, 1877) (additional source)
Benthosema pterotum (Alcock, 1890) (additional source)
Benthosema suborbitale (Gilbert, 1913) (additional source)
Beroe cucumis Fabricius, 1780 (additional source)
Beroe forskalii Milne Edwards, 1841 (additional source)
Beryx splendens Lowe, 1834 (additional source)
Bicrisia edwardsiana (d'Orbigny, 1841) (additional source)
Biddulphia aurita (Lyngbye) Brébisson, 1838 accepted as Odontella aurita (Lyngbye) C.Agardh, 1832 (additional source)