Acanthophora nayadiformis (Delile) Papenfuss, 1968 (additional source)
Acanthurus monroviae Steindachner, 1876 (additional source)
Acartia centrura Giesbrecht, 1889 represented as Acartia (Odontacartia) centrura Giesbrecht, 1889 (additional source)
Acartia grani (Sars G.O., 1904) accepted as Paracartia grani Sars G.O., 1904 represented as Paracartia grani grani Sars G.O., 1904 (additional source)
Acartia tonsa Dana, 1849-1852 represented as Acartia (Acanthacartia) tonsa Dana, 1849-1852 (additional source)
Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833 (additional source)
Acipenser stellatus Pallas, 1771 (additional source)
Acrochaetium balticum (Rosenvinge) Aleem & Schulz, 1952 (additional source)
Acrothamnion preissii (Sonder) E.M.Wollaston, 1968 (additional source)
Acrothrix gracilis Kylin, 1907 (additional source)
Agardhiella subulata (C.Agardh) Kraft & M.J.Wynne, 1979 (additional source)
Aglaothamnion feldmanniae Halos, 1965 (additional source)
Alaria esculenta (Linnaeus) Greville, 1830 (additional source)
Alexandrium leei Balech, 1985 (additional source)
Alexandrium pseudogonyaulax (Biecheler) Horiguchi ex K.Yuki & Y.Fukuyo, 1992 (additional source)
Alkmaria romijni Horst, 1919 (additional source)
Alpheus audouini Coutière, 1905 accepted as Alpheus edwardsii (Audouin, 1826) (basis of record)
Alpheus inopinatus Holthuis & Gottlieb, 1958 (basis of record)
Alpheus migrans Lewinsohn & Holthuis, 1978 (additional source)
Alpheus rapacida De Man, 1908 (additional source)
Ameira divagans Nicholls, 1939 represented as Ameira divagans divagans Nicholls, 1939 (additional source)
Anadara natalensis (Krauss, 1848) (additional source)
Anguillicola crassus Kuwahara, Niimi & Itagaki, 1974 (additional source)
Anoplodactylus digitatus (Böhm, 1879) (additional source)
Anotrichium furcellatum (J.Agardh) Baldock, 1976 (additional source)
Antigona lamellaris Schumacher, 1817 (additional source)
Antithamnion densum (Suhr) M.Howe, 1914 (additional source)
Antithamnion diminuatum Wollaston, 1968 (additional source)
Antithamnionella elegans (Berthold) J.H.Price & D.M.John, 1986 (additional source)
Antithamnionella spirographidis (Schiffner) E.M.Wollaston, 1968 (additional source)
Antithamnionella ternifolia (Hooker f. & Harvey) Lyle, 1922 (additional source)
Apoglossum gregarium (E.Y.Dawson) M.J.Wynne, 1985 accepted as Phrix spatulata (E.Y.Dawson) M.J.Wynne, M.Kamiya & J.A.West, 2018 (additional source)
Arachnoidea protecta Harmer, 1915 accepted as Arachnoidella protecta Harmer, 1915 (additional source)
Ashtoret lunaris (Forskål, 1775) (additional source)
Asparagopsis armata Harvey, 1855 (additional source)
Asparagopsis taxiformis (Delile) Trevisan de Saint-Léon, 1845 (additional source)
Asperococcus scaber Kuckuck, 1899 (additional source)
Aspidosiphon (Akrikos) mexicanus (Murina, 1967) (additional source)
Asterina burtoni Gray, 1840 accepted as Aquilonastra burtoni (Gray, 1840) (additional source)
Asterina wega Valenciennes (MS) in Perrier, 1869 accepted as Aquilonastra burtoni (Gray, 1840) (additional source)
Asterionella japonica Cleve, 1882 (additional source)
Atactodea glabrata (Gmelin, 1791) accepted as Atactodea striata (Gmelin, 1791) (additional source)
Atergatis roseus (Rüppell, 1830) (additional source)
Atherinomorus lacunosus (Forster, 1801) (additional source)
Balanus amphitrite amphitrite Darwin, 1854 accepted as Amphibalanus amphitrite amphitrite (Darwin, 1854) (additional source)
Balanus eburneus Gould, 1841 accepted as Amphibalanus eburneus (Gould, 1841) (additional source)
Balanus improvisus Darwin, 1854 accepted as Amphibalanus improvisus (Darwin, 1854) (additional source)
Balanus reticulatus Utinomi, 1967 accepted as Amphibalanus reticulatus (Utinomi, 1967) (additional source)
Balanus trigonus Darwin, 1854 (additional source)
Beroe ovatus Bruguière, 1789 accepted as Beroe ovata Bruguière, 1789 (additional source)
Beryx splendens Lowe, 1834 (additional source)
Bhawania goodei Webster, 1884 (additional source)
Blackfordia virginica Mayer, 1910 (additional source)
Boccardia semibranchiata Guérin, 1990 (additional source)
Bonnemaisonia hamifera Hariot, 1891 (additional source)
Botrylloides violaceus Oka, 1927 (additional source)
Botryocladia madagascariensis G.Feldmann, 1945 (additional source)
Bougainvillia rugosa Clarke, 1882 (additional source)
Brachynotus sexdentatus (Risso, 1827) (additional source)
Branchiomma boholense (Grube, 1878) (additional source)
Branchiomma luctuosum (Grube, 1870) (additional source)
Branchiura sowerbyi Beddard, 1892 (additional source)
Bugula neritina (Linnaeus, 1758) (additional source)
Bursatella leachi accepted as Bursatella leachii Blainville, 1817 (additional source)
Calanopia elliptica (Dana, 1849-1852) (additional source)
Calanopia media Gurney, 1927 (additional source)
Calappa pelii Herklots, 1851 (additional source)
Callinectes danae Smith, 1869 (additional source)
Callinectes sapidus Rathbun, 1896 (additional source)
Canuellina insignis Gurney, 1927 (additional source)
Caprella macho Platvoet, de Bruyne & Gmelig Meyling, 1995 accepted as Caprella mutica Schurin, 1935 (additional source)
Caprella mutica Schurin, 1935 (additional source)
Carcharhinus altimus (Springer, 1950) (additional source)
Carcharhinus falciformis (Müller & Henle, 1839) (additional source)
Carupa tenuipes Dana, 1852 (additional source)
Caulacanthus ustulatus (Turner) Kützing, 1843 (additional source)
Caulerpa mexicana Sonder ex Kützing, 1849 (additional source)
Caulerpa racemosa (Forsskål) J.Agardh, 1873 (additional source)
Caulerpa scalpelliformis (R.Brown ex Turner) C.Agardh, 1817 (additional source)
Caulerpa taxifolia (M.Vahl) C.Agardh, 1817 (additional source)
Ceramium strobiliforme G.W.Lawson & D.M.John, 1982 (additional source)
Ceratonereis mirabilis Kinberg, 1865 (additional source)
Cerithiopsis tenthrenois (Melvill, 1896) (additional source)
Cerithium egenum A. Gould, 1849 (additional source)
Cerithium nesioticum Pilsbry & Vanatta, 1906 (additional source)
Chaetoceros coarctatus Lauder, 1864 (additional source)
Chaetogammarus ischnus (Stebbing, 1899) (additional source)
Chaetogammarus warpachowskyi (G.O. Sars, 1894) (basis of record)
Chama pacifica Broderip, 1835 (additional source)
Charybdis (Charybdis) hellerii (A. Milne-Edwards, 1867) (additional source)
Charybdis (Goniohellenus) longicollis Leene, 1938 accepted as Charybdis (Archias) longicollis Leene, 1938 (additional source)
Chattonella marina (Subrahmanyan) Y.Hara & Chihara, 1982 (additional source)
Chaunax suttkusi Caruso, 1989 (additional source)
Chilomycterus spilostylus Leis & Randall, 1982 accepted as Cyclichthys spilostylus (Leis & Randall, 1982) (additional source)
Chondria polyrhiza F.S.Collins & Hervey, 1917 (additional source)
Chondria pygmaea Garbary & Vandermeulen, 1990 (additional source)
Chorda filum (Linnaeus) Stackhouse, 1797 (additional source)
Chrysallida fischeri (Hornung & Mermod, 1925) accepted as Pyrgulina fischeri Hornung & Mermod, 1925 (additional source)
Chrysallida maiae (Hornung & Mermod, 1924) accepted as Pyrgulina maiae Hornung & Mermod, 1924 (additional source)
Chrysopetalum debile (Grube, 1855) (additional source)

Mediterranean Sea for Elysia grandifolia Kelaart, 1858  (origin: alien)
Mediterranean Sea for Elysia tomentosa K. R. Jensen, 1997  (origin: alien)