Aequorea Péron & Lesueur, 1810 (additional source)
Aetea anguina (Linnaeus, 1758) (additional source)
Aetideus Brady, 1883 (additional source)
Aetideus armatus (Boeck, 1872) (additional source)
Amaroucium Milne Edwards, 1841 accepted as Aplidium Savigny, 1816 (basis of record)
Ampharete acutifrons (Grube, 1860) (additional source)
Ampharete finmarchica (M. Sars, 1865) (additional source)
Amphiascoides debilis (Giesbrecht, 1881) (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphitrite Müller, 1771 (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Ancistrosyllis groenlandica McIntosh, 1878 (additional source)
Anonyx lilljeborgi Boeck, 1871 (additional source)
Anoplostoma Bütschli, 1874 (additional source)
Antomicron Cobb, 1920 (additional source)
Arabella iricolor (Montagu, 1804) (additional source)
Aricidea Webster, 1879 (additional source)
Aricidea quadrilobata Webster & Benedict, 1887 represented as Aricidea (Strelzovia) quadrilobata Webster & Benedict, 1887 (additional source)
Artacama proboscidea Malmgren, 1866 (additional source)
Ascarophis van Beneden, 1871 (additional source)
Ascidia Linnaeus, 1767 (additional source)
Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845 (additional source)
Axonolaimus de Man, 1889 (additional source)
Balanus crenatus Bruguière, 1789 (additional source)
Barentsia Hincks, 1880 (additional source)
Barentsia gracilis (Sars, 1835) (additional source)
Bathylaimus Cobb, 1894 (additional source)
Beroe Browne, 1756 accepted as Beroe O.F. Müller, 1776 (additional source)
Bopyroides hippolytes (Kröyer, 1838) (additional source)
Bosmina (Bosmina) longirostris (O.F. Müller, 1785) (additional source)
Bougainvillia Lesson, 1830 (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)
Bradyidius similis (Sars G.O., 1902) (additional source)
Brania clavata (Claparède, 1863) accepted as Salvatoria clavata (Claparède, 1863) (additional source)
Bugula flabellata (Thompson in Gray, 1848) accepted as Bugulina flabellata (Thompson in Gray, 1848) (additional source)
Caligus coryphaenae Steenstrup & Lütken, 1861 (additional source)
Callopora craticula (Alder, 1856) (additional source)
Callopora lineata (Linnaeus, 1767) (additional source)
Calycella syringa (Linnaeus, 1767) (additional source)
Campanularia groenlandica Levinsen, 1893 (basis of record)
Campanularia hincksii Alder, 1856 (additional source)
Campanularia volubilis (Linnaeus, 1758) (additional source)
Campylaimus Cobb, 1920 (additional source)
Candacia armata Boeck, 1872 (additional source)
Capillaria Zeder, 1800 (additional source)
Capitella Blainville, 1828 (additional source)
Capitella capitata (Fabricius, 1780) (additional source)
Caprella penantis Leach, 1814 (additional source)
Cauloramphus cymbaeformis (Hincks, 1877) (additional source)
Cauloramphus spiniferum (Johnston, 1832) (additional source)
Cerebratulus Renier, 1804 (additional source)
Chaetopterus Cuvier, 1830 (additional source)
Chaetozone setosa Malmgren, 1867 (additional source)
Chiridius gracilis Farran, 1908 (additional source)
Chone Krøyer, 1856 (additional source)
Chone infundibuliformis Krøyer, 1856 (additional source)
Chromadora Bastian, 1865 (additional source)
Chromadora nudicapitata Bastian, 1865 (additional source)
Chromadorina (additional source)
Circeis spirillum (Linnaeus, 1758) (additional source)
Cirratulus Lamarck, 1818 (additional source)
Cirratulus cirratus (O. F. Müller, 1776) (additional source)
Cirratulus filiformis Keferstein, 1862 accepted as Aphelochaeta filiformis (Keferstein, 1862) (additional source)
Cirrophorus branchiatus Ehlers, 1908 (additional source)
Cirrophorus furcatus (Hartman, 1957) (additional source)
Clava multicornis (Forsskål, 1775) (additional source)
Cliona celata Grant, 1826 (additional source)
Clymenella Verrill, 1873 (additional source)
Clymenura Verrill, 1900 (additional source)
Clytia Lamouroux, 1812 (additional source)
Clytia hemisphaerica (Linnaeus, 1767) (additional source)
Cobbia de Man, 1907 (additional source)
Conchoderma auritum (Linnaeus, 1767) (additional source)
Cordylophora caspia (Pallas, 1771) (additional source)
Coronula diadema (Linnaeus, 1767) (additional source)
Corophium acherusicum A. Costa, 1853 accepted as Monocorophium acherusicum (A. Costa, 1853) (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)
Coryne pusilla Gaertner, 1774 (additional source)
Cossura longocirrata Webster & Benedict, 1887 (additional source)
Cribrilina annulata (O. Fabricius, 1780) accepted as Juxtacribrilina annulata (Fabricius, 1780) (additional source)
Crisia eburneodenticulata Smitt ms in Busk, 1875 (basis of record)
Crossaster papposus (Linnaeus, 1767) (additional source)
Cucullanus cirratus Müller, 1777 (additional source)
Cucullanus heterochrous Rudolphi, 1802 (additional source)
Dactylopusia tisboides (Claus, 1863) (additional source)
Dactylopusia vulgaris Sars G.O., 1905 represented as Dactylopusia vulgaris vulgaris Sars G.O., 1905 (additional source)
Danielssenia typica Boeck, 1873 (additional source)
Daptonema Cobb, 1920 (additional source)
Derogenes varicus (Müller, 1784) Looss, 1901 (additional source)
Desmoscolex Claparède, 1863 (additional source)
Dimophyes arctica (Chun, 1897) (additional source)
Dinophilus gyrociliatus O. Schmidt, 1857 accepted as Dimorphilus gyrociliatus (O. Schmidt, 1857) (additional source)
Dinophysis acuminata Claparède & Lachmann, 1859 (additional source)
Diphasia Agassiz, 1862 (additional source)
Diphyllobothrium Cobbold, 1858 (additional source)
Diplocirrus Haase, 1915 (additional source)
Dodecaceria concharum Örsted, 1843 (additional source)