Abra longicallus (Scacchi, 1835) (additional source)
Adyte pellucida (Ehlers, 1864) accepted as Subadyte pellucida (Ehlers, 1864) (basis of record)
Alentia gelatinosa (M. Sars, 1835) (additional source)
Altenaeum Spaink, 1972 (basis of record)
Altenaeum dawsoni (Jeffreys, 1864) (basis of record)
Alvania abyssicola (Forbes, 1850) accepted as Alvania testae (Aradas & Maggiore, 1844) (basis of record)
Ampharete lindstroemi Hessle, 1917 (additional source)
Aricidea albatrossae Pettibone, 1957 represented as Aricidea (Aricidea) albatrossae Pettibone, 1957 (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)
Autolytus inermis Saint-Joseph, 1887 accepted as Myrianida inermis (Saint Joseph, 1887) (additional source)
Berthella plumula (Montagu, 1803) (additional source)
Brada inhabilis (Rathke, 1843) (additional source)
Brania limbata (Claparède, 1868) accepted as Salvatoria limbata (Claparède, 1868) (additional source)
Bylgides sarsi (Kinberg in Malmgren, 1866) (additional source)
Capitella giardi (Mesnil, 1897) (additional source)
Capitella minima Langerhans, 1880 (additional source)
Cardiomya costellata (Deshayes, 1835) (additional source)
Chamelea striatula (da Costa, 1778) (additional source)
Chirimia Light, 1991 (additional source)
Chirimia biceps (M. Sars, 1861) (additional source)
Chone longocirrata M. Sars in G.O. Sars, 1872 accepted as Chone duneri Malmgren, 1867 (additional source)
Cirrophorus armatus (Glémarec, 1966) represented as Paradoneis armata Glémarec, 1966 (basis of record)
Cirrophorus lyra (Southern, 1914) represented as Paradoneis lyra (Southern, 1914) (basis of record)
Clymenella torquata (Leidy, 1855) (additional source)
Coryphella browni Picton, 1980 (additional source)
Crassadoma pusio (Linnaeus, 1758) accepted as Talochlamys pusio (Linnaeus, 1758) (additional source)
Cuspidaria costellata (Deshayes, 1835) accepted as Cardiomya costellata (Deshayes, 1835) (source of synonymy)
Cylichnina umbilicata (Montagu, 1803) accepted as Retusa umbilicata (Montagu, 1803) (additional source)
Dasybranchus caducus (Grube, 1846) (additional source)
Drilonereis brattstroemi Fauchald, 1972 (additional source)
Enipo elisabethae McIntosh, 1900 (additional source)
Ensis americanus (A. Gould, 1870) accepted as Ensis leei M. Huber, 2015 (basis of record)
Erycina (Hemilepton) nitidum (W. Turton, 1822) accepted as Hemilepton nitidum (W. Turton, 1822) (additional source)
Euclymene lindrothi Eliason, 1962 (additional source)
Eulalia tripunctata McIntosh, 1874 (additional source)
Eulimella scillae (Scacchi, 1835) (additional source)
Eulimella ventricosa (Forbes, 1844) (additional source)
Eumida ockelmanni Eibye-Jacobsen, 1987 (additional source)
Eunice dubitata Fauchald, 1974 (additional source)
Euphrosine borealis Örsted, 1843 (additional source)
Euryleptidae Lang, 1884 accepted as Euryleptidae Stimpson, 1857 (additional source)
Eusyllis assimilis Marenzeller, 1875 (additional source)
Gattyana amondseni (Malmgren, 1867) (additional source)
Glycera tesselata Grube, 1863 (additional source)
Glycera unicornis Lamarck, 1818 (additional source)
Harmothoe extenuata (Grube, 1840) (additional source)
Hyalopecten similis (Laskey, 1811) accepted as Similipecten similis (Laskey, 1811) (additional source)
Isocirrus planiceps (M. Sars in G.O. Sars, 1872) (additional source)
Jasmineira candela (Grube, 1863) accepted as Claviramus candelus (Grube, 1863) (additional source)
Lanassa venusta (Malm, 1874) (additional source)
Lucina borealis (Linnaeus, 1767) accepted as Lucinoma borealis (Linnaeus, 1767) (basis of record)
Lumbrineris agastos Fauchald, 1974 accepted as Lumbrineris futilis Kinberg, 1865 (additional source)
Lumbrineris aniara Fauchald, 1974 (additional source)
Lysippides fragilis (Wollebaeck, 1912) accepted as Lysippe fragilis (Wollebaek, 1912) (additional source)
Macoma calcarea (Gmelin, 1791) (additional source)
Malmgrenia andreapolis McIntosh, 1874 (additional source)
Malmgrenia arenicolae (Saint-Joseph, 1888) (basis of record)
Malmgrenia glabra (Malmgren, 1866) accepted as Harmothoe glabra (Malmgren, 1865) (basis of record)
Malmgrenia ljungmani (Malmgren, 1867) (basis of record)
Malmgrenia lunulata (Delle Chiaje, 1830) (additional source)
Malmgrenia marphysae (McIntosh, 1876) (basis of record)
Malmgrenia mcintoshi (Tebble & Chambers, 1982) (additional source)
Mediomastus fragilis Rasmussen, 1973 (additional source)
Microclymene acirrata Arwidsson, 1906 (additional source)
Microphthalmus aberrans (Webster & Benedict, 1887) (additional source)
Microspio mecznikowiana (Claparède, 1869) (additional source)
Montacuta tenella Lovén, 1846 accepted as Tellimya tenella (Lovén, 1846) (additional source)
Myriochele danielsseni Hansen, 1878 (additional source)
Mysella dawsoni (Jeffreys, 1864) accepted as Altenaeum dawsoni (Jeffreys, 1864) (additional source)
Mystides caeca Langerhans, 1880 (additional source)
Neoleanira tetragona (Örsted, 1845) (additional source)
Nereiphylla lutea (Malmgren, 1865) (additional source)
Nicomache trispinata Ardwidsson, 1906 represented as Nicomache (Loxochona) trispinata Arwidsson, 1906 (additional source)
Nuculana pernula (O. F. Müller, 1779) (additional source)
Okenia leachii (Alder & Hancock, 1854) (additional source)
Oligocladus Lang, 1884 (additional source)
Oligocladus sanguinolentus Lang, 1884 (additional source)
Onchnesoma squamatum (Koren & Danielssen, 1875) (additional source)
Onoba vitrea (Montagu, 1803) accepted as Hyala vitrea (Montagu, 1803) (basis of record)
Ophelia rathkei McIntosh, 1908 (additional source)
Ophelina minima Hartmann-Schröder, 1974 (additional source)
Ophelina modesta Støp-Bowitz, 1958 (additional source)
Ophelina norvegica Støp-Bowitz, 1945 (additional source)
Paradiopatra fiordica (Fauchald, 1974) (additional source)
Paradiopatra quadricuspis (M. Sars in G.O. Sars, 1872) (additional source)
Petaloproctus borealis Ardwisson, 1906 (additional source)
Pholoe synophthalmica Claparède, 1868 accepted as Pholoe inornata Johnston, 1839 (additional source)
Pirakia punctifera (Grube, 1860) accepted as Eumida punctifera (Grube, 1860) (additional source)
Polycirrus plumosus (Wollebaek, 1912) (additional source)
Prionospio fallax Söderström, 1920 (additional source)
Protodriloides chaetifer (Remane, 1926) (additional source)
Protodrilus rubropharyngeus Jägersten, 1940 accepted as Lindrilus rubropharyngeus (Jägersten, 1940) (additional source)
Protomystides exigua (Eliason, 1962) (additional source)
Pusillina inconspicua (Alder, 1844) (additional source)
Saxicava arctica (Linnaeus, 1767) accepted as Hiatella arctica (Linnaeus, 1767) (basis of record)
Semierycina nitida (W. Turton, 1822) accepted as Hemilepton nitidum (W. Turton, 1822) (basis of record)
Sige fusigera Malmgren, 1865 (additional source)

 Authority

 for Alvania subsoluta (Aradas, 1847)

(Arras, 1847) [details]

 Authority

 for Bylgides sarsi (Kinberg in Malmgren, 1866)

(Malmgren, 1865) [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]

 Synonymy

 for Cylichnina umbilicata (Montagu, 1803)

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