Abietinaria abietina (Linnaeus, 1758) (additional source)
Abietinaria filicula (Ellis & Solander, 1786) (additional source)
Acanthodoris pilosa (Abildgaard, 1789) (additional source)
Acanthonotozoma serratum (O. Fabricius, 1780) (additional source)
Acaulis primarius Stimpson, 1853 (additional source)
Achelia spinosa (Stimpson, 1853) (additional source)
Adalaria proxima (Alder & Hancock, 1854) (additional source)
Aeginina longicornis (Krøyer, 1843) (additional source)
Amblyosyllis finmarchica (Malmgren, 1867) (additional source)
Ampelisca macrocephala Liljeborg, 1853 (additional source)
Ampelisca vadorum Mills, 1963 (additional source)
Ampharete acutifrons (Grube, 1860) (additional source)
Amphipholis squamata (Delle Chiaje, 1828) (additional source)
Amphiporus angulatus (Müller, 1774) (additional source)
Amphiporus groenlandicus Örsted, 1843 (additional source)
Amphiporus lactifloreus (Johnston, 1828) (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Anomia squamula Linnaeus, 1758 accepted as Heteranomia squamula (Linnaeus, 1758) (additional source)
Anonyx lilljeborgi Boeck, 1871 (additional source)
Anonyx sarsi Steele & Brunel, 1968 (additional source)
Aphanostoma sanguineum Beklemischev, 1915 accepted as Pseudactinoposthia sanguineum (Beklemischev, 1915) (basis of record)
Apistobranchus tullbergi (Théel, 1879) (additional source)
Aplidium glabrum (Verrill, 1871) (additional source)
Aplidium pallidum (Verrill, 1871) (additional source)
Arenicola marina (Linnaeus, 1758) (additional source)
Aricidea nolani Webster & Benedict, 1887 (basis of record)
Aricidea quadrilobata Webster & Benedict, 1887 represented as Aricidea (Strelzovia) quadrilobata Webster & Benedict, 1887 (additional source)
Artacama proboscidea Malmgren, 1866 (additional source)
Ascidia callosa Stimpson, 1852 (additional source)
Ascidia prunum Müller, 1776 (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)
Asterias rubens Linnaeus, 1758 (additional source)
Astrotorhynchus bifidus (McIntosh, 1874) Graff, 1905 (additional source)
Astyris rosacea (A. Gould, 1840) (additional source)
Aulactinia stella (Verrill, 1864) (additional source)
Aurelia aurita (Linnaeus, 1758) (additional source)
Autolytus cornutus Agassiz, 1862 accepted as Proceraea cornuta (Agassiz, 1862) (additional source)
Autolytus verrilli Marenzeller, 1892 accepted as Epigamia alexandri (Malmgren, 1867) (additional source)
Balanus balanus (Linnaeus, 1758) (additional source)
Balanus crenatus Bruguière, 1789 (additional source)
Bolinopsis infundibulum (O.F. Müller, 1776) (additional source)
Boltenia echinata (Linnaeus, 1767) (additional source)
Boltenia ovifera (Linnaeus, 1767) (additional source)
Boreotrophon clathratus (Linnaeus, 1767) (additional source)
Boreotrophon truncatus (Strøm, 1768) (additional source)
Bougainvillia superciliaris (L. Agassiz, 1849) (additional source)
Bowerbankia gracilis Leidy, 1855 accepted as Amathia gracilis (Leidy, 1855) (additional source)
Brada villosa (Rathke, 1843) accepted as Bradabyssa villosa (Rathke, 1843) (additional source)
Buccinum ciliatum (O. Fabricius, 1780) (additional source)
Byblis gaimardi (Krøyer, 1846) accepted as Byblis gaimardii (Krøyer, 1846) (additional source)
Caberea ellisii (Fleming, 1814) (additional source)
Caecognathia elongata (Krøyer, 1847) (additional source)
Calathura brachiata (Stimpson, 1853) (additional source)
Calliopius laeviusculus (Krøyer, 1838) (additional source)
Callopora aurita (Hincks) accepted as Amphiblestrum auritum (Hincks, 1877) (additional source)
Callopora craticula (Alder, 1856) (additional source)
Calycella syringa (Linnaeus, 1767) (additional source)
Campanularia groenlandica Levinsen, 1893 (additional source)
Campanularia volubilis (Linnaeus, 1758) (additional source)
Candelabrum phrygium (Fabricius, 1780) (additional source)
Capitella capitata (Fabricius, 1780) (additional source)
Caprella linearis (Linnaeus, 1767) (additional source)
Caprella septentrionalis Krøyer, 1838 (additional source)
Caridion gordoni (Spence Bate, 1858) (additional source)
Catablema vesicarium (A. Agassiz, 1862) (additional source)
Cauloramphus cymbaeformis (Hincks, 1877) (additional source)
Celleporella hyalina (Linnaeus, 1767) (additional source)
Cephalothrix linearis (Rathke, 1799) (additional source)
Chaetozone setosa Malmgren, 1867 (additional source)
Chiridota laevis (O. Fabricius, 1780) (additional source)
Ciona intestinalis (Linnaeus, 1767) (additional source)
Cirratulus cirratus (O. F. Müller, 1776) (additional source)
Clava multicornis (Forsskål, 1775) (additional source)
Clinocardium ciliatum (O. Fabricius, 1780) accepted as Ciliatocardium ciliatum ciliatum (O. Fabricius, 1780) represented as Ciliatocardium ciliatum (O. Fabricius, 1780) (additional source)
Cliona vastifica Hancock, 1849 accepted as Pione vastifica (Hancock, 1849) (additional source)
Clitellio (Clitellio) arenarius (Müller, 1776) (additional source)
Clytia hemisphaerica (Linnaeus, 1767) (additional source)
Cnemidocarpa mollis (Stimpson, 1852) (additional source)
Coelogynopora schulzii Meixner, 1938 (basis of record)
Colus islandicus (Mohr, 1786) (additional source)
Colus pubescens (A. E. Verrill, 1882) (additional source)
Cossura longocirrata Webster & Benedict, 1887 (additional source)
Crangon septemspinosa Say, 1818 (additional source)
Cribrilina annulata (O. Fabricius, 1780) accepted as Juxtacribrilina annulata (Fabricius, 1780) (additional source)
Crisia eburnea (Linnaeus, 1758) (additional source)
Crossaster papposus (Linnaeus, 1767) (additional source)
Ctenodiscus crispatus (Bruzelius, 1805) (additional source)
Cucumaria frondosa (Gunnerus, 1767) (additional source)
Curtitoma violacea (Mighels & C. B. Adams, 1842) (additional source)
Cyanea capillata (Linnaeus, 1758) (additional source)
Cyanophthalma vittata (Verrill, 1874) (basis of record)
Cylichna occulta (Mighels & C. B. Adams, 1842) accepted as Cylichnoides occultus (Mighels & C. B. Adams, 1842) (additional source)
Dendrobeania decorata (Verrill, 1879) (additional source)
Dendrobeania murrayana (Bean in Johnston, 1847) (additional source)
Dendrodoa carnea (Agassiz, 1850) (additional source)
Dendrodoa grossularia (Van Beneden, 1846) (additional source)
Dendrodoa pulchella (Rathke, 1806) (additional source)
Dendronotus frondosus (Ascanius, 1774) (additional source)
Dexamine thea Boeck, 1861 (additional source)