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)
Adalaria proxima (Alder & Hancock, 1854) (additional source)
Aeginina longicornis (Krøyer, 1843) (additional source)
Agalma elegans (M. Sars, 1846) (additional source)
Ampelisca macrocephala Liljeborg, 1853 (additional source)
Ampharete acutifrons (Grube, 1860) (additional source)
Amphipholis squamata (Delle Chiaje, 1828) (additional source)
Amphiporus bioculatus sensu Verrill, 1892 (additional source)
Amphiporus lactifloreus (Johnston, 1828) (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Amphitrite johnstoni Malmgren, 1866 accepted as Neoamphitrite figulus (Dalyell, 1853) (additional source)
Anaitides groenlandica (Örsted, 1842) accepted as Phyllodoce groenlandica Örsted, 1842 (additional source)
Anaitides maculata (Linnaeus, 1767) accepted as Phyllodoce maculata (Linnaeus, 1767) (additional source)
Anaitides mucosa (Örsted, 1843) accepted as Phyllodoce mucosa Örsted, 1843 (additional source)
Anomia simplex A. d'Orbigny, 1853 (additional source)
Anonyx lilljeborgi Boeck, 1871 (additional source)
Anonyx sarsi Steele & Brunel, 1968 (additional source)
Apistobranchus tullbergi (Théel, 1879) (additional source)
Aplidium glabrum (Verrill, 1871) (additional source)
Aplidium pallidum (Verrill, 1871) (additional source)
Arabella iricolor (Montagu, 1804) (additional source)
Arenicola marina (Linnaeus, 1758) (additional source)
Aricidea quadrilobata Webster & Benedict, 1887 represented as Aricidea (Strelzovia) quadrilobata Webster & Benedict, 1887 (additional source)
Artacama proboscidea Malmgren, 1866 (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)
Aurelia aurita (Linnaeus, 1758) (additional source)
Autolytus prolifera (O.F. Müller, 1788) accepted as Myrianida prolifera (O.F. Müller, 1788) (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)
Bopyroides hippolytes (Kröyer, 1838) (additional source)
Boreotrophon clathratus (Linnaeus, 1767) (additional source)
Boreotrophon truncatus (Strøm, 1768) (additional source)
Botryllus schlosseri (Pallas, 1766) (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)
Bugula fulva Ryland, 1960 accepted as Bugulina fulva (Ryland, 1960) (additional source)
Bugula simplex Hincks, 1886 accepted as Bugulina simplex (Hincks, 1886) (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)
Calliostoma occidentale (Mighels & C. B. Adams, 1842) (additional source)
Callopora craticula (Alder, 1856) (additional source)
Calycella syringa (Linnaeus, 1767) (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 penantis Leach, 1814 (additional source)
Caprella septentrionalis Krøyer, 1838 (additional source)
Carcinus maenas (Linnaeus, 1758) (additional source)
Caridion gordoni (Spence Bate, 1858) (additional source)
Celleporella hyalina (Linnaeus, 1767) (additional source)
Cephalothrix linearis (Rathke, 1799) (additional source)
Cerebratulus lacteus (Leidy, 1851) (additional source)
Chaetozone setosa Malmgren, 1867 (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) (additional source)
Cliona vastifica Hancock, 1849 accepted as Pione vastifica (Hancock, 1849) (additional source)
Clitellio (Clitellio) arenarius (Müller, 1776) (additional source)
Clymenella torquata (Leidy, 1855) (additional source)
Clytia hemisphaerica (Linnaeus, 1767) (additional source)
Cnemidocarpa mollis (Stimpson, 1852) (additional source)
Colus islandicus (Mohr, 1786) (additional source)
Colus pygmaeus (A. Gould, 1841) (additional source)
Corophium crassicorne Bruzelius, 1859 accepted as Crassicorophium crassicorne (Bruzelius, 1859) (additional source)
Corophium insidiosum Crawford, 1937 accepted as Monocorophium insidiosum (Crawford, 1937) (additional source)
Cossura longocirrata Webster & Benedict, 1887 (additional source)
Craterolophus convolvulus (Johnston, 1835) (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)
Cylichna occulta (Mighels & C. B. Adams, 1842) accepted as Cylichnoides occultus (Mighels & C. B. Adams, 1842) (additional source)
Dendrobeania murrayana (Bean in Johnston, 1847) (additional source)
Dendrodoa grossularia (Van Beneden, 1846) (additional source)
Dendronotus frondosus (Ascanius, 1774) (additional source)
Dexamine thea Boeck, 1861 (additional source)
Diastylis lucifera (Krøyer, 1837) (additional source)
Didemnum albidum (Verrill, 1871) (additional source)
Diphasia fallax (Johnston, 1847) (additional source)
Diphasia pinastrum (Cuvier, 1830) accepted as Diphasia margareta (Hassall, 1841) (additional source)
Dipolydora quadrilobata (Jacobi, 1883) (additional source)
Dodecaceria concharum Örsted, 1843 (additional source)