Aaptos aaptos (Schmidt, 1864) (additional source)
Abietinaria Kirchenpauer, 1884 (additional source)
Abudefduf vaigiensis (Quoy & Gaimard, 1825) (additional source)
Abylopsis eschscholtzii (Huxley, 1859) (additional source)
Abylopsis tetragona (Otto, 1823) (additional source)
Acanthella Schmidt, 1862 (additional source)
Acanthella acuta Schmidt, 1862 (additional source)
Acanthephyra curtirostris Wood-Mason in Wood-Mason & Alcock, 1891 (additional source)
Acanthephyra eximia Smith, 1884 (additional source)
Acanthephyra purpurea A. Milne-Edwards, 1881 (additional source)
Acanthochondrites annulatus (Olsson, 1869) (additional source)
Acanthocybium solandri (Cuvier, 1832) (additional source)
Acanthogorgia armata Verrill, 1878 (additional source)
Acanthophora muscoides (Linnaeus) Bory de Saint-Vincent, 1828 (additional source)
Acanthoscina acanthodes (Stebbing, 1895) (additional source)
Acartia (Acanthacartia) fossae Gurney, 1927 (additional source)
Acartia (Acartia) danae Giesbrecht, 1889 (basis of record)
Acartia (Acartia) negligens Dana, 1849-1852 (basis of record)
Acartia (Acartiura) longiremis (Lilljeborg, 1853) (basis of record)
Acasta spongites (Poli, 1791) (additional source)
Acervulina inhaerens Schultze, 1854 (additional source)
Acetabularia caliculus J.V.Lamouroux, 1824 (additional source)
Acetabularia parvula Solms-Laubach, 1895 accepted as Parvocaulis parvulus (Solms-Laubach) S.Berger, Fettweiss, Gleissberg, Liddle, U.Richter, Sawitzky & Zuccarello, 2003 (additional source)
Achelia echinata sinensis (Lou, 1936) accepted as Achelia japonica Ortmann, 1890 (basis of record)
Achnanthes biasolettiana Grunow, 1880 accepted as Achnanthidium pyrenaicum (Hustedt) H.Kobayasi, 1997 accepted as Achnanthes pyrenaica var. pyrenaica Hustedt, 1939 (additional source)
Achnanthes brevipes C.Agardh, 1824 (additional source)
Achnanthes brevipes var. brevipes Agardh, 1824 (additional source)
Achnanthes brevipes var. parvula (Kützing) Cleve, 1895 accepted as Achnanthes parvula Kützing, 1844 (additional source)
Achnanthes clevei Grunow, 1880 accepted as Karayevia clevei (Grunow) Round & Bukhtiyarova, 1999 (additional source)
Achnanthes delicatula (Kützing) Grunow in Cleve & Grunow, 1880 accepted as Planothidium delicatulum (Kützing) Round & Bukhtiyarova, 1996 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844 (additional source)
Achnanthes exigua Grunow, 1880 (additional source)
Achnanthes hauckiana Grunow, 1880 (additional source)
Achnanthes longipes C.Agardh, 1824 (additional source)
Achnanthes microcephala (Kützing) Grunow, 1880 accepted as Achnanthidium microcephalum Kützing, 1844 (additional source)
Achnanthes minutissima Kützing, 1833 (additional source)
Acinetospora crinita (Carmichael) Sauvageau, 1899 (additional source)
Acrocalanus andersoni Bowman, 1958 (additional source)
Acrocalanus gibber Giesbrecht, 1888 (additional source)
Acrocalanus longicornis Giesbrecht, 1888 (additional source)
Acrochaetium densum (K.M.Drew) Papenfuss, 1945 accepted as Acrochaetium catenulatum M.Howe, 1914 (additional source)
Acrochaetium humile (Rosenvinge) Børgesen, 1915 (additional source)
Acrochaetium macula (Rosenvinge) Hamel, 1927 (additional source)
Acrochaetium microscopicum (Nägeli ex Kützing) Nägeli, 1858 (additional source)
Acrochaetium parvulum (Kylin) Hoyt, 1920 (additional source)
Acrosorium venulosum (Zanardini) Kylin, 1924 (additional source)
Acryptolaria conferta (Allman, 1877) (additional source)
Acryptolaria crassicaulis (Allman, 1888) (additional source)
Actinocyclus curvatulus Janisch, 1874 (additional source)
Actinocyclus ehrenbergii Ralfs, 1861 (additional source)
Actinocyclus ehrenbergii var. ralfsii (W.Smith) Hustedt, 1929 accepted as Eupodiscus ralfsii var. ralfsii W. Smith, 1856 (additional source)
Actinocyclus ehrenbergii var. tenella (Brébisson) Hustedt, 1929 accepted as Eupodiscus tenellus Brébisson, 1854 (additional source)
Actinocyclus normanii (Gregory) Hustedt, 1957 (additional source)
Actinocyclus subtilis (W.Gregory) Ralfs, 1861 (additional source)
Actinonema pachydermatum Cobb, 1920 (additional source)
Actinoptychus splendens (Shadbolt) Ralfs ex Pritchard, 1861 (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)
Adeonellopsis coscinophora (Reuss, 1848) (additional source)
Adercotryma glomeratum (Brady, 1878) (additional source)
Adna anglica (Sowerby, 1823) (basis of record)
Aegaeon lacazei (Gourret, 1887) (additional source)
Aegina citrea Eschscholtz, 1829 (additional source)
Aeginura grimaldii Maas, 1904 (additional source)
Aegisthus mucronatus Giesbrecht, 1891 (additional source)
Aeolidiella Bergh, 1867 (additional source)
Aequorea aequorea (Forsskål, 1775) accepted as Aequorea forskalea Péron & Lesueur, 1810 (additional source)
Aequorea conica Browne, 1905 (additional source)
Aequorea macrodactyla (Brandt, 1835) (additional source)
Aequorea pensilis (Haeckel, 1879) (additional source)
Aetea anguina (Linnaeus, 1758) (additional source)
Aetea truncata (Landsborough, 1852) (additional source)
Aetideopsis armata (Boeck, 1873) (additional source)
Aetideopsis multiserrata (Wolfenden, 1904) (additional source)
Aetideus acutus Farran, 1929 (additional source)
Aetideus armatus (Boeck, 1873) (additional source)
Aetideus giesbrechti Cleve, 1904 (additional source)
Agalma elegans (M. Sars, 1846) (additional source)
Aglantha elata (Haeckel, 1879) (additional source)
Aglaophenia Lamouroux, 1812 (additional source)
Aglaophenia parvula Bale, 1882 (additional source)
Aglaophenia tubulifera (Hincks, 1861) (additional source)
Aglaura hemistoma Péron & Lesueur, 1810 (additional source)
Aix galericulata (Linnaeus, 1758) (additional source)
Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000 (additional source)
Alciopina parasitica Claparède & Panceri, 1867 (additional source)
Alcyonidium mytili Dalyell, 1848 accepted as Alcyonidioides mytili (Dalyell, 1848) (additional source)
Alderia modesta (Lovén, 1844) (additional source)
Aldrovandia affinis (Günther, 1877) (additional source)
Alepes djedaba (Forsskål, 1775) (additional source)
Alepisaurus ferox Lowe, 1833 (additional source)
Alexandrium catenella (Whedon & Kofoid) Balech, 1985 (additional source)
Alexandrium leei Balech, 1985 (additional source)
Algirosphaera robusta (Lohmann) R.E.Norris, 1984 (additional source)
Alopias superciliosus Lowe, 1841 (additional source)
Alopias vulpinus (Bonnaterre, 1788) (additional source)
Alpheus audouini Coutière, 1905 accepted as Alpheus edwardsii (Audouin, 1826) (additional source)
Alpheus edwardsii (Audouin, 1826) (additional source)
Alpheus inopinatus Holthuis & Gottlieb, 1958 (additional source)
Alpheus lobidens De Haan, 1849 (additional source)
Alpheus rapacida De Man, 1908 (additional source)

Chinese part of the Eastern China Sea for Musculus senhousia (W. H. Benson, 1842)