Abra longicallus (Scacchi, 1835) (additional source)
Altenaeum Spaink, 1972 (basis of record)
Altenaeum dawsoni (Jeffreys, 1864) (basis of record)
Ampharete goesi Malmgren, 1866 (additional source)
Ampharete lindstroemi Hessle, 1917 (additional source)
Asclerocheilus intermedius (Saint-Joseph, 1894) (additional source)
Astarte borealis (Schumacher, 1817) accepted as Tridonta borealis Schumacher, 1817 (additional source)
Astarte elliptica (T. Brown, 1827) accepted as Tridonta elliptica (T. Brown, 1827) (additional source)
Astarte montagui (Dillwyn, 1817) accepted as Tridonta montagui (Dillwyn, 1817) (additional source)
Austrolaenilla mollis (Sars, 1872) (additional source)
Autolytus alexandri Malmgren, 1867 accepted as Epigamia alexandri (Malmgren, 1867) (additional source)
Bispira crassicornis (Sars, 1851) (additional source)
Brada inhabilis (Rathke, 1843) (additional source)
Bylgides elegans (Théel, 1879) (additional source)
Bylgides groenlandicus (Malmgren, 1867) (additional source)
Bylgides sarsi (Kinberg in Malmgren, 1866) (additional source)
Capitella giardi (Mesnil, 1897) (additional source)
Cirrophorus lyra (Southern, 1914) represented as Paradoneis lyra (Southern, 1914) (basis of record)
Clymenella torquata (Leidy, 1855) (additional source)
Corambe obscura (A. E. Verrill, 1870) (additional source)
Coryphella gracilis (Alder & Hancock, 1844) (additional source)
Coryphella verrucosa (M. Sars, 1829) (additional source)
Crassostrea virginica (Gmelin, 1791) (additional source)
Cuthona pustulata (Alder & Hancock, 1854) accepted as Zelentia pustulata (Alder & Hancock, 1854) (additional source)
Cylichnina umbilicata (Montagu, 1803) accepted as Retusa umbilicata (Montagu, 1803) (additional source)
Dasybranchus caducus (Grube, 1846) (additional source)
Dinophilus gyrociliatus O. Schmidt, 1857 accepted as Dimorphilus gyrociliatus (O. Schmidt, 1857) (additional source)
Discocelides Bergendal, 1893 (additional source)
Eucranta villosa Malmgren, 1865 (additional source)
Eulimella ventricosa (Forbes, 1844) (additional source)
Eunice norvegica (Linnaeus, 1767) (additional source)
Euphrosine borealis Örsted, 1843 (additional source)
Eusyllis lamelligera Marion & Bobretzky, 1875 (additional source)
Fabricia stellaris (Müller, 1774) (additional source)
Foviella Bock, 1925 (additional source)
Foviella affinis (Ørsted, 1843) (additional source)
Gattyana amondseni (Malmgren, 1867) (additional source)
Glaciarcula Elliott, 1956 (additional source)
Glaciarcula spitzbergensis (Davidson, 1852) (additional source)
Gonatus fabricii (Lichtenstein, 1818) (additional source)
Harmothoe extenuata (Grube, 1840) (additional source)
Iphitime hartmanae Kirkegaard, 1977 (additional source)
Lanassa venusta (Malm, 1874) (additional source)
Lora turricula [sic] accepted as Oenopota turricula (Montagu, 1803) accepted as Propebela turricula (Montagu, 1803) (basis of record)
Lumbriclymene minor Arwidsson, 1906 (additional source)
Macoma calcarea (Gmelin, 1791) (additional source)
Marenzelleria viridis (Verrill, 1873) (additional source)
Melinna elisabethae McIntosh, 1885 (additional source)
Micropharynx Jägerskiöld, 1896 (basis of record)
Micropharynx parasitica Jägerskiöld, 1896 (basis of record)
Microphthalmus aberrans (Webster & Benedict, 1887) (additional source)
Microphthalmus sczelkowii Mecznikow, 1865 (additional source)
Neoleanira tetragona (Örsted, 1845) (additional source)
Nicomache personata Johnson, 1901 (additional source)
Nuculana pernula (O. F. Müller, 1779) (additional source)
Onchidoris fusca (O. F. Müller, 1776) accepted as Onchidoris bilamellata (Linnaeus, 1767) (additional source)
Ophelina abranchiata Støp-Bowitz, 1948 (additional source)
Paradiopatra quadricuspis (M. Sars in G.O. Sars, 1872) (additional source)
Pherusa flabellata (M. Sars in G.O. Sars, 1872) accepted as Therochaeta flabellata (Sars in Sars, 1872) (additional source)
Philine angulata Jeffreys, 1867 (additional source)
Placida dendritica (Alder & Hancock, 1843) (additional source)
Planoceridae Lang, 1884 (additional source)
Plehniidae Bock, 1913 (additional source)
Polycera dubia M. Sars, 1829 accepted as Palio dubia (M. Sars, 1829) (additional source)
Potamilla torelli Malmgren, 1866 (additional source)
Proceraea cornuta (Agassiz, 1862) (additional source)
Proceraea prismatica (O.F. Müller, 1776) (additional source)
Proclymene muelleri (Sars, 1856) (additional source)
Protodriloides chaetifer (Remane, 1926) (additional source)
Psammodrilus balanoglossoides Swedmark, 1952 (additional source)
Rossia palpebrosa Owen, 1835 (basis of record)
Sabussowia Bohmig, 1906 (additional source)
Stygocapitella subterranea Knöllner, 1934 (additional source)
Syllides benedicti Banse, 1971 (additional source)
Tectura testudinalis (O. F. Müller, 1776) accepted as Testudinalia testudinalis (O. F. Müller, 1776) (additional source)
Xylophaga dorsalis (W. Turton, 1819) (additional source)
Yoldiella lucida (Lovén, 1846) (additional source)

 Authority

 for Alvania subsoluta (Aradas, 1847)

(Arras, 1847) [details]

 Authority

 for Austrolaenilla mollis (Sars, 1872)

(M. Sars, 1872) [details]

 Authority

 for Bispira crassicornis (Sars, 1851)

(M. Sars, 1851) [details]

 Authority

 for Brania pusilla (Dujardin, 1851)

Brania pusilla Dujardin, 1839 [details]

 Authority

 for Bylgides sarsi (Kinberg in Malmgren, 1866)

(Malmgren, 1865) [details]

 Authority

 for Eurylepta cornuta (Müller OF, 1776)

(O. F. Müller, 1776) [details]

 Authority

 for Foviella affinis (Ørsted, 1843)

(Oersted, 1843) [details]

 Authority

 for Geitodoris planata (Alder & Hancock, 1846)

Alder & Hancock, 1846 [details]

 Authority

 for Harmothoe aspera (Hansen, 1878)

(Hansen, 1878) published in 1879 ! (R. Barnich) [details]

 Authority

 for Hero formosa (Lovén, 1844)

Lovén, 1844 [details]

 Authority

 for Limea loscombii (G. B. Sowerby I, 1823)

(G B Sowerby I, 1823) [details]

 Authority

 for Lineus albocinctus Verrill, 1900

(Bergendal, 1903) [details]

 Authority

 for Lumbriclymene minor Arwidsson, 1906

Arwidsson, 1907 [details]

 Authority

 for Mangelia smithii (Forbes, 1840)

Author: Risso in de Kluijver et al (2000). [details]

 Authority

 for Nerillidium marinum (Faubel, 1978)

(Faubel, 1978) [details]

 Authority

 for Nicomache minor Arwidsson, 1906

Arwidsson, 1907 [details]

 Authority

 for Nicomache trispinata Ardwidsson, 1906

Arwidsson, 1906 [details]

 Authority

 for Notoplana atomata (Müller OF, 1776)

Notoplana atomata (Müller, 1776) [details]

 Authority

 for Oligocladus sanguinolentus Lang, 1884

(Quatrefages, 1845) [details]

 Authority

 for Petaloproctus borealis Ardwisson, 1906

Arwidsson, 1906 [details]

 Authority

 for Phyllochaetopterus major Claparède, 1869

Claparède, 1868 [details]

 Authority

 for Platynereis massiliensis (Moquin-Tandon, 1869)

(Tandon, 1868) [details]

 Authority

 for Pleurobranchus membranaceus (Montagu, 1816)

Pleurobranchus membranaceus (Montagu, 1815) [details]

 Authority

 for Pseudopotamilla reniformis (Bruguière, 1789)

Not O.F. Müller, 1771, as not a binomen at that time. See notes for Amphitrite reniformis Bruguiére, 1879 [details]

 Authority

 for Rissoella globularis (Forbes & Hanley, 1853)

Rissoella globularis (Forbes & Hanley, 1853); Forbes & Hanley, 1853 ex Jeffreys ms [details]

 Authority

 for Stylostomum ellipse (Dalyell, 1853)

Dalyell, 1853 [details]

 Authority

 for Thracia distorta (Montagu, 1803)

year of description is not 1808 but 1813; not the original combination [details]

 Authority

 for Thyasira ferruginea (Locard, 1886)

Thyasira ferruginea Locard, 1898 [details]

 Spelling

 for Autolytus edwardsii Saint Joseph, 1887

Autolytus edwarsi [details]

 Spelling

 for Crassadoma F. R. Bernard, 1986

genus Crassodoma written as Crassadoma [details]

 Spelling

 for Glycera rouxii Audouin & Milne Edwards, 1833

Glycera rouxii [details]

 Spelling

 for Halliella Monterosato, 1878

Haliella Monterosato, 1878 [details]

 Spelling

 for Phascolion strombi (Montagu, 1804)

Phascolion strombus [details]

 Spelling

 for Psiloteredo megotara (Hanley, 1848)

Psiloteredo megotara [details]

 Spelling

 for Roxania utriculus (Brocchi, 1814)

Roxania utricula [details]

 Spelling

 for Tapes (Ruditapes) decussatus (Linnaeus, 1758)

Tapes decussata [details]

 Spelling

 for Tonicella marmorea (O. Fabricius, 1780)

Tonecella marmoreus [details]

 Spelling

 for Tonicella marmorea (O. Fabricius, 1780)

Tonicella marmoreus [details]

 Synonymy

 for Cylichnina umbilicata (Montagu, 1803)

Synonymised with Retusa (Cylichnina) umbilicata (Montagu, 1803) [details]

 Synonymy

 for Idasola Iredale, 1915

Genus Idas Jeffreys, 1876 is valid synonym. Idasola Iredale, 1915 is not listed as a valid synonym in CLEMAM. [details]

 Synonymy

 for Pododesmus squama (Gmelin, 1791)

Synonymised with Monia squama (Gmelin, 1791) [details]