Abietinaria Kirchenpauer, 1884 (additional source)
Abludomelita Karaman, 1981 (additional source)
Abludomelita gladiosa (Spence Bate & Westwood, 1862) (additional source)
Abludomelita obtusata (Montagu, 1813) (additional source)
Acteon tornatilis (Linnaeus, 1758) (additional source)
Alcyonidiidae Johnston, 1837 (additional source)
Alcyonidium mytili Dalyell, 1848 accepted as Alcyonidioides mytili (Dalyell, 1848) (additional source)
Anaitides citrina (Malmgren, 1865) accepted as Phyllodoce citrina Malmgren, 1865 (basis of record)
Anaitides groenlandica (Örsted, 1842) accepted as Phyllodoce groenlandica Örsted, 1842 (basis of record)
Angulus tenuis (da Costa, 1778) accepted as Macomangulus tenuis (da Costa, 1778) (basis of record)
Anthuridae Leach, 1814 (additional source)
Aphelochaeta multibranchiis [auct. lapsus] accepted as Aphelochaeta multibranchis (Grube, 1863) (basis of record)
Aplysia Linnaeus, 1767 (additional source)
Aponuphis Kucheruk, 1978 (additional source)
Aponuphis bilineata (Baird, 1870) (additional source)
Arcturella dilatata (G. O. Sars, 1883) accepted as Astacilla dilatata G. O. Sars, 1883 (additional source)
Arcturidae Dana, 1849 (additional source)
Aricidea (Aricidea) albatrossae Pettibone, 1957 (additional source)
Ascidia conchilega Müller, 1776 (additional source)
Ascidia mentula Müller, 1776 (additional source)
Aspidelectra Levinsen, 1909 (additional source)
Aspidelectra melolontha (Landsborough, 1852) (additional source)
Astarte triangularis (Montagu, 1803) accepted as Goodallia triangularis (Montagu, 1803) (basis of record)
Atylus guttatus (A. Costa in Hope, 1851) accepted as Nototropis guttatus (A. Costa in Hope, 1851) (additional source)
Autonoe Bruzelius, 1859 (additional source)
Autonoe longipes (Liljeborg, 1852) (additional source)
Balanus Costa, 1778 (additional source)
Beania Johnston, 1840 (additional source)
Beania mirabilis Johnston, 1840 (additional source)
Beaniidae Canu & Bassler, 1927 (additional source)
Boccardiella Blake & Kudenov, 1978 (additional source)
Boccardiella ligerica (Ferronnière, 1898) (additional source)
Bopyrus squillarum Latreille, 1804 accepted as Bopyrus crangorum (Fabricius, 1798) (additional source)
Byblis Boeck, 1871 (additional source)
Byblis gaimardi (Krøyer, 1846) accepted as Byblis gaimardii (Krøyer, 1846) (additional source)
Callianassa laticauda Otto, 1821 accepted as Gilvossius tyrrhenus (Petagna, 1792) (basis of record)
Callianassa laticauda Otto, 1821 accepted as Gilvossius tyrrhenus (Petagna, 1792) (source of synonymy)
Calycella Hincks, 1864 in Allman, 1864 (additional source)
Campanulinidae Hincks, 1868 (basis of record)
Campylaspis costata (Sars, 1865) (additional source)
Campylaspis glabra Sars, 1878 (additional source)
Campylaspis legendrei Fage, 1951 (additional source)
Campylaspis rubicunda (Liljeborg, 1855) (additional source)
Cardium ovale G. B. Sowerby II, 1840 accepted as Parvicardium pinnulatum (Conrad, 1831) (basis of record)
Cerastoderma exiguum (Gmelin, 1791) accepted as Cardium exiguum Gmelin, 1791 accepted as Parvicardium exiguum (Gmelin, 1791) (basis of record)
Cerithiella metula (Lovén, 1846) (additional source)
Chaetozone gibber Woodham & Chambers, 1994 (additional source)
Chirona hameri (Ascanius, 1767) (additional source)
Chorizopora Hincks, 1879 (additional source)
Chorizopora brongniartii (Audouin, 1826) (additional source)
Circomphalus casina (Linnaeus, 1758) accepted as Venus casina Linnaeus, 1758 (basis of record)
Clathrina Gray, 1867 (additional source)
Clathrina coriacea (Montagu, 1814) (additional source)
Clathrus clathrus (Linnaeus, 1758) accepted as Epitonium clathrus (Linnaeus, 1758) (basis of record)
Clathrus clathrus (Linnaeus, 1758) accepted as Epitonium clathrus (Linnaeus, 1758) (source of synonymy)
Cnidaria (additional source)
Cochlodesma (Bontaea) praetenue (Pulteney, 1799) accepted as Cochlodesma praetenue (Pulteney, 1799) (additional source)
Colus gracilis (da Costa, 1778) (additional source)
Conilera cylindracea (Montagu, 1804) (additional source)
Crangonidae Haworth, 1825 (additional source)
Crenella decussata (Montagu, 1808) (additional source)
Cribrilina Gray, 1848 (additional source)
Cribrilina annulata (O. Fabricius, 1780) accepted as Juxtacribrilina annulata (Fabricius, 1780) (additional source)
Cribrilina punctata (Hassall, 1841) (additional source)
Cylichna cylindracea (Pennant, 1777) (additional source)
Decipula tenella (Lovén, 1846) accepted as Tellimya tenella (Lovén, 1846) (basis of record)
Demonax branchyona [Auctt.] accepted as Demonax brachychona (Claparède, 1870) accepted as Parasabella saxicola (Grube, 1861) (additional source)
Dendrodoa MacLeay, 1824 (additional source)
Diastylis laevis Norman, 1869 (additional source)
Diastyloides biplicatus (Sars G.O., 1865) (additional source)
Diastyloides serratus (Sars G.O., 1865) (additional source)
Distomus Gaertner, 1774 (additional source)
Distomus variolosus Gaertner, 1774 (additional source)
Echiurus Guérin-Méneville, 1831 (additional source)
Ehlersia ferrugina Langerhans, 1881 accepted as Paraehlersia ferrugina (Langerhans, 1881) (additional source)
Electra Lamouroux, 1816 (additional source)
Electra monostachys (Busk, 1854) (additional source)
Electra pilosa (Linnaeus, 1767) (additional source)
Ericthonius rubricornis (Stimpson, 1853) (additional source)
Escharina Milne Edwards, 1836 (additional source)
Escharina hyndmanni (Johnston, 1847) accepted as Herentia hyndmanni (Johnston, 1847) (additional source)
Euclymene droebachiensis (Sars, 1872) (additional source)
Eudendriidae L. Agassiz, 1862 (basis of record)
Eulalia aurea Gravier, 1896 (additional source)
Eulalia ornata Saint-Joseph, 1888 (additional source)
Eurydice inermis Hansen, 1890 (additional source)
Eurypon Gray, 1867 (additional source)
Eurypon lacazei (Topsent, 1891) (additional source)
Eurystrotos Hayward & Ryland, 1985 accepted as Oncousoecia Canu, 1918 (additional source)
Eurystrotos compacta (Norman, 1866) accepted as Oncousoecia dilatans (Johnston, 1847) (additional source)
Facelina bostoniensis (Couthouy, 1838) (additional source)
Flustra Linnaeus, 1761 (additional source)
Galathowenia fragilis (Nilsen & Holthe, 1985) (additional source)
Gammaropsis cornuta (Norman, 1869) accepted as Megamphopus cornutus Norman, 1869 (basis of record)
Gari fervensis (Gmelin, 1791) (additional source)
Gattyana amondseni (Malmgren, 1867) (additional source)
Glossobalanus marginatus Meek, 1922 (additional source)
Glycera dayi O'Connor, 1987 accepted as Glycera celtica O'Connor, 1987 (additional source)
Glycera mimica Hartman, 1965 accepted as Glycera capitata Örsted, 1842 (additional source)
Glyphohesione klatti Friedrich, 1950 (additional source)

 Authority

 for Campylaspis glabra Sars, 1878

G.O. Sars, 1879 [details]

 Authority

 for Conilera cylindracea (Montagu, 1804)

(Montagu, 1803) [details]

 Authority

 for Devonia perrieri (Malard, 1904)

(Mallard, 1904) [details]

 Authority

 for Distomus variolosus Gaertner, 1774

Gaertner in Pallas, 1774 [details]

 Authority

 for Ehlersia ferrugina Langerhans, 1881

(Lagerhans, 1881) [details]

 Authority

 for Escharina hyndmanni (Johnston, 1847)

Johnston, 1847 [details]

 Authority

 for Harmothoe longisetis (Grube, 1863)

Grube, 1863 [details]

 Authority

 for Iphinoe serrata Norman, 1867

Bate, 1856 [details]

 Authority

 for Parvipalpus capillaceus (Chevreux, 1888)

(Chevreux, 1888) [details]

 Authority

 for Pseudione callianassae Kossmann, 1881

Kossman, 1881 [details]

 Authority

 for Sphaerosyllis taylori Perkins, 1981

Perkins, 1980 [details]

 Validity

 for Spisula solida (Linnaeus, 1758)

Valid as Spisula (Spisula) solida (Linnaeus, 1758) [details]