Abra intermedia Thompson accepted as Abra nitida (O.F. Müller, 1776) (habitat flag source)
Acanthochitona crinitus (Pennant, 1777) accepted as Acanthochitona crinita (Pennant, 1777) (habitat flag source)
Acanthocyclops robustus (G.O. Sars, 1863) (habitat flag source)
Acanthoica aculeata Kamptner, 1941 (habitat flag source)
Acartia lefevreae Bradford, 1976 (habitat flag source)
Acetabularia mediterranea J.V. Lamouroux, 1816 accepted as Acetabularia acetabulum (Linnaeus) P.C. Silva, 1952 (habitat flag source)
Achnanthes danica (Flögel) Cleve & Grun, 1880 (habitat flag source)
Acinetospora pusilla (Griffiths ex Harvey) De Toni, 1895 accepted as  (habitat flag source)
Acmaea testudinalis (O.F. Müller, 1776) accepted as Tectura testudinalis (O.F. Müller, 1776) (habitat flag source)
Acrochaetium botryocarpum (Harvey) J.G. Agardh, 1892 accepted as Colaconema caespitosum (J.G. Agardh) Jackelman, Stegenga & J.J. Bolton, 1991 (habitat flag source)
Acrochaetium dasyae F.S. Collins, 1906 accepted as Colaconema dasyae (F.S. Collins) Stegenga, I. Mol, Prud'homme van Reine & Lokhorst, 1997 (habitat flag source)
Acroperus harpae (Baird, 1834) (habitat flag source)
Actinia coccinea O.F. Müller, 1776 accepted as Stomphia coccinea (Müller, 1776) (habitat flag source)
Actinia crassicornis Müller, 1776 accepted as Urticina felina (Linnaeus, 1761) (habitat flag source)
Actinia crassicornis Delle Chiaje accepted as Hormathia digitata (O.F. Müller, 1776) (habitat flag source)
Actinia gemmacea Ellis & Solander, 1786 accepted as Urticina felina (Linnaeus, 1761) (habitat flag source)
Actinia troglodytes Price in Johnston, 1847 accepted as Sagartia troglodytes (Price in Johnston, 1847) (habitat flag source)
Adenoides kofoidii (Herdman) Dodge, 1982 (habitat flag source)
Aglaothamnion furcellariae (J.G. Agardh) Feldmann-Mazoyer, 1941 accepted as Aglaothamnion tenuissimum (Bonnemaison) Feldmann-Mazoyer, 1941 (habitat flag source)
Agroeca proxima (O. Pickard-Cambridge, 1871) (habitat flag source)
Alderia amphibia Allman, 1845 accepted as Alderia modesta (Lovén, 1844) (habitat flag source)
Alderia scaldiana Nyst, 1855 accepted as Alderia modesta (Lovén, 1844) (habitat flag source)
Alona rectangula Sars, 1861 (habitat flag source)
Alopecosa accentuata (Latreille, 1817) (habitat flag source)
Ameira hyalina (Noodt, 1952) (habitat flag source)
Ameira tenella G.O. Sars, 1907 accepted as Filexilia attenuata (I.C. Thompson, 1893) (habitat flag source)
Ammotrypane aulogaster Rathke, 1843 accepted as Ophelina aulogaster (Rathke, 1843) (habitat flag source)
Amphiascoides limicolus (Brady, 1900) (habitat flag source)
Amphicora mediterranea Leydig, 1851 accepted as Amphiglena mediterranea (Leydig, 1851) (habitat flag source)
Amphipholis januarii Ljungman, 1866 (habitat flag source)
Amphiporus cordiceps sensu Friedrich, 1933 accepted as Cyanophthalma cordiceps (Friedrich, 1933) (habitat flag source)
Amphithopsis glaber Boeck, 1861 accepted as Pleusymtes glaber (Boeck, 1861) (habitat flag source)
Amphora salina W. Smith, 1853 (habitat flag source)
Anaptychia fusca (Huds.) Vain., 1899 accepted as Anaptychia runcinata (With.) J.R. Laundon, 1984 (habitat flag source)
Anaptychia runcinata (With.) J.R. Laundon, 1984 (habitat flag source)
Anemonia sulcata (Pennant, 1777) (habitat flag source)
Angulus fabula (Gmelin, 1791) accepted as Tellina fabula Gmelin, 1791 (habitat flag source)
Anilocra frontalis H. Milne Edwards, 1840 (habitat flag source)
Anisonema emarginatum Stokes, 1887 (habitat flag source)
Anisonema pusillum Stokes, 1888 (habitat flag source)
Antithamnion plumula (J. Ellis) Thuret, 1863 accepted as Pterothamnion plumula (J. Ellis) Nägeli, 1855 (habitat flag source)
Antithamnion spirographidis Schiffner, 1916 accepted as Antithamnionella spirographidis (Schiffner) E.M. Wollaston, 1968 (habitat flag source)
Antithamnionella sarniensis Lyle, 1922 accepted as Antithamnionella ternifolia (J.D. Hooker & Harvey) Lyle, 1922 (habitat flag source)
Anuraeopsis fissa Gosse, 1851 (habitat flag source)
Apocorophium acutum (Chevreux, 1908) (habitat flag source)
Apocorophium lacustre (Vanhöffen, 1911) (habitat flag source)
Araeosoma fenestratum (Thomson, 1872) (habitat flag source)
Arca nodulosa O.F. Müller, 1776 (habitat flag source)
Arctosa perita (Latreille, 1799) (habitat flag source)
Argonauta minor Risso, 1854 accepted as Argonauta argo Linnaeus, 1758 (habitat flag source)
Aricia cuvierii Audouin & Milne Edwards, 1833 accepted as Orbinia cuvierii (Audouin & Milne Edwards, 1833) (habitat flag source)
Armadillidium album Dollfus, 1887 (habitat flag source)
Armadillidium depressum Brandt, 1833 (habitat flag source)
Arthonia phaeobaea (J.M. Norman) J.M. Norman, 1869 (habitat flag source)
Arthopyrenia kelpii Körb., 1865 accepted as Pyrenocollema halodytes (Nyl.) R.C. Harris, 1987 (habitat flag source)
Ascophyllum laevigatum Stackhouse, 1809 accepted as Ascophyllum nodosum (Linnaeus) Le Jolis, 1863 (habitat flag source)
Asellus aquaticus (Linnaeus, 1758) (habitat flag source)
Aspicilia leprosescens (Sandst.) Motyka, 1995 (habitat flag source)
Asterias lincki Müller & Troschel, 1842 accepted as Urasterias lincki (Müller & Troschel, 1842) (habitat flag source)
Asterocytis ramosa (Thwaites) Gobi ex F. Schmitz, 1896 accepted as Chroodactylon ornatum (C. Agardh) Basson, 1979 (habitat flag source)
Auliscus caelatus J.W. Bailey, 1854 accepted as Auliscus sculptus (W. Smith) Ralfs in Pritchard, 1861 (habitat flag source)
Balanus reticulatus Utinomi, 1967 (habitat flag source)
Balanus variegatus Darwin, 1854 (habitat flag source)
Balcis alba (da Costa, 1778) (habitat flag source)
Bathyphantes parvulus (Westring, 1851) (habitat flag source)
Berenicea diluviana Lamouroux, 1821 † (habitat flag source)
Berenicea patina (Lamarck, 1816) (habitat flag source)
Bolbosoma balaenae (Gmelin, 1790) (habitat flag source)
Bolbosoma brevicolle (Malm, 1867) (habitat flag source)
Botrylloides violaceus Oka, 1927 (habitat flag source)
Brachionus diversicornis (Daday, 1883) (habitat flag source)
Branchioglossum bipinnatifidum (Montagne) M.J. Wynne, 1983 (habitat flag source)
Brockmanniella brockmannii (Hustedt) Hasle, Stosch & Syvertsen, 1983 (habitat flag source)
Bryaxis brevicornis G.O. Sars, 1901 accepted as Comantenna brevicornis (G.O. Sars, 1901) (habitat flag source)
Bryaxis minor Farran, 1905 accepted as Paracomantenna minor (Farran, 1905) (habitat flag source)
Bryocamptus minutus (Claus, 1863) (habitat flag source)
Bulla punctata A. Adams, 1850 accepted as Bulla punctulata A. Adams in Sowerby, 1850 (habitat flag source)
Bulla umbilicata Röding, 1798 accepted as Bulla striata Bruguière, 1792 (habitat flag source)
Calliostoma papillosum (habitat flag source)
Callithamnion byssoides Arnott ex Harvey, 1833 accepted as Aglaothamnion tenuissimum (Bonnemaison) Feldmann-Mazoyer, 1941 (habitat flag source)
Callithamnion hookeri (Dillwyn) S.F. Gray, 1821 accepted as Aglaothamnion hookeri (Dillwyn) Maggs & Hommersand, 1993 (habitat flag source)
Callithamnion roseum Harvey, 1849 (habitat flag source)
Callithamnion roseum (Roth) Lyngbye, 1819 accepted as Aglaothamnion roseum (Roth) Maggs & L'Hardy-Halos, 1993 (habitat flag source)
Caloplaca marina (Wedd.) Zahlbr., 1921 (habitat flag source)
Caloplaca maritima (B. de Lesd.) B. de Lesd., 1953 (habitat flag source)
Caloplaca microthallina (Wedd.) Zahlbr., 1931 (habitat flag source)
Caloplaca saxicola (Hoffm.) Nordin, 1972 (habitat flag source)
Caloplaca thallincola (Wedd.) Du Rietz, 1925 (habitat flag source)
Calycomonas vangoorii (W. Conrad) J.W.G. Lund, 1960 accepted as Ollicola vangoorii (W. Conrad) Vørs, 1992 (habitat flag source)
Campanularia spinulosa Bale, 1888 accepted as Obelia bidentata Clark, 1875 (habitat flag source)
Campylaspis affinis Sars, 1870 (habitat flag source)
Campylaspis verrucosa Sars, 1866 (habitat flag source)
Campylodiscus latus Shadb., 1854 (habitat flag source)
Cancer granarius Herbst, 1783 accepted as Carcinus maenas (Linnaeus, 1758) (habitat flag source)
Cancer granulatus Say, 1817 accepted as Carcinus maenas (Linnaeus, 1758) (habitat flag source)
Cancer pygmaeus Fabricius, 1787 accepted as Carcinus maenas (Linnaeus, 1758) (habitat flag source)
Cancer viridis Herbst, 1783 accepted as Carcinus maenas (Linnaeus, 1758) (habitat flag source)
Canuella indica Krishnaswamy, 1957 (habitat flag source)
Capsosiphon aureolus (C. Agardh) Gobi, 1879 accepted as Capsosiphon fulvescens (C. Agardh) Setchell & N.L. Gardner, 1920 (habitat flag source)
Cardium edule Linnaeus, 1758 accepted as Cerastoderma edule (Linnaeus, 1758) (habitat flag source)