Acholoe squamosa (Delle Chiaje, 1827) (additional source)
Aglaophamus malmgreni (Théel, 1879) (additional source)
Alentia gelatinosa (M. Sars, 1835) (additional source)
Amaeana Hartman, 1959 (original description)
Amaeana trilobata (Sars, 1863) (new combination reference)
Amblyosillis plectorhyncha Marenzeller, 1874 accepted as Amblyosyllis formosa (Claparède, 1863) accepted as Amblyosyllis spectabilis (Johnston in Baird, 1861) (source of synonymy)
Amblyosyllis formosa (Claparède, 1863) accepted as Amblyosyllis spectabilis (Johnston in Baird, 1861) (additional source)
Amblyosyllis lineata Grube, 1863 (source of synonymy)
Amblyosyllis lineolata (A. Costa, 1864) accepted as Amblyosyllis spectabilis (Johnston in Baird, 1861) (additional source)
Ammotrypane Rathke, 1843 accepted as Ophelina Örsted, 1843 (subsequent type designation)
Ampharete Malmgren, 1866 (subsequent type designation)
Ampharete acutifrons (Grube, 1860) (additional source)
Ampharete vega (Wirén, 1883) (additional source)
Amphictene auricoma (O.F. Müller, 1776) (additional source)
Amphictene auricoma mediterranea (Nilsson, 1928) (basis of record)
Amphiduros Hartman, 1959 (source of synonymy)
Amphiglena mediterranea (Leydig, 1851) (additional source)
Amphinome rostrata (Pallas, 1766) (additional source)
Amphiro Kinberg, 1865 accepted as Marphysa Quatrefages, 1866 (status source)
Amphiro simplex Langerhans, 1884 accepted as Marphysa simplex (Langerhans, 1884) (source of synonymy)
Amphitrite cirrata Müller, 1776 (additional source)
Amphitrite johnstoni Malmgren, 1866 accepted as Neoamphitrite figulus (Dalyell, 1853) (source of synonymy)
Amphitrite luna Dalyell, 1853 (status source)
Amphitrite rubra (Risso, 1826) (source of synonymy)
Amphitrite variabilis (Risso, 1826) (additional source)
Amphitritides gracilis (Grube, 1860) (additional source)
Anaitides maculata (Linnaeus, 1767) accepted as Phyllodoce maculata (Linnaeus, 1767) (additional source)
Anaitis rosea McIntosh, 1877 accepted as Phyllodoce rosea (McIntosh, 1877) (new combination reference)
Antinoe Kinberg, 1856 (subsequent type designation)
Antinoella sarsi promamme (Malmgren, 1867) accepted as Bylgides promamme (Malmgren, 1867) (basis of record)
Apomatus similis Marion & Bobretzky, 1875 (source of synonymy)
Arabella coeca Fauvel, 1940 (additional source)
Arabella iricolor (Montagu, 1804) (additional source)
Archidice Kinberg, 1866 accepted as Cirratulus Lamarck, 1818 (source of synonymy)
Arenicola marina (Linnaeus, 1758) (additional source)
Arenicola montagui Leach in Johnston, 1865 accepted as Arenicolides branchialis (Audouin & Milne Edwards, 1833) (source of synonymy)
Arenicola nodosa Leach in Johnston, 1865 accepted as Arenicolides branchialis (Audouin & Milne Edwards, 1833) (source of synonymy)
Arenicolides branchialis (Audouin & Milne Edwards, 1833) (additional source)
Arenicolides ecaudata (Johnston, 1835) (additional source)
Aricia edwardsi McIntosh, 1910 accepted as Orbinia edwardsi (McIntosh, 1910) (source of synonymy)
Aricidea longobranchiata Day, 1961 (basis of record)
Autolytus prolifera (O.F. Müller, 1788) accepted as Myrianida prolifera (O.F. Müller, 1788) (additional source)
Autolytus verrilli Marenzeller, 1892 accepted as Epigamia alexandri (Malmgren, 1867) (source of synonymy)
Axionice flexuosa (Grube, 1860) (additional source)
Axionice maculata (Dalyell, 1853) accepted as Pista maculata (Dalyell, 1853) (additional source)
Axiothella catenata (Malmgren, 1865) (additional source)
Bhawania goodei Webster, 1884 (additional source)
Branchiomma argus (Sars, 1862) (basis of record)
Branchiomma bombyx (Dalyell, 1853) (source of synonymy)
Branchiomma dalyelli Kölliker, 1858 accepted as Branchiomma bombyx (Dalyell, 1853) (additional source)
Branchiomma inconspicua (M. Sars in G.O. Sars, 1872) (additional source)
Branchiomma lucullanum (Delle Chiaje, 1828) (additional source)
Brania adspersa (Grube, 1868) (basis of record)
Brania arminii (Langerhans, 1881) (additional source)
Brania atokalis (Czerniavsky, 1881) (additional source)
Brania clavata (Claparède, 1863) accepted as Salvatoria clavata (Claparède, 1863) (additional source)
Brania jonssonii Saemundsson, 1918 (basis of record)
Brania limbata (Claparède, 1868) accepted as Salvatoria limbata (Claparède, 1868) (basis of record)
Brania pusilla (Dujardin, 1851) (additional source)
Brania tenuicirrata (Claparède, 1864) accepted as Salvatoria tenuicirrata (Claparède, 1864) (additional source)
Calizonella [auct. misspelling] accepted as Krohnia Quatrefages, 1866 (basis of record)
Capitella capitata (Fabricius, 1780) (additional source)
Castalia multipapillata Théel, 1879 (source of synonymy)
Caulleriella bioculata (Keferstein, 1862) (additional source)
Caulleriella killariensis (Southern, 1914) accepted as Tharyx killariensis (Southern, 1914) (additional source)
Caulleriella zetlandica (McIntosh, 1911) accepted as Chaetozone zetlandica McIntosh, 1911 (additional source)
Ceratonereis costae (Grube, 1840) accepted as Composetia costae (Grube, 1840) (additional source)
Ceratonereis hircinicola (Eisig, 1869) accepted as Composetia hircinicola (Eisig, 1869) (source of synonymy)
Ceratonereis mirabilis Kinberg, 1865 (additional source)
Chaetopterus variopedatus (Renier, 1804) (additional source)
Chaetozone zetlandica McIntosh, 1911 (source of synonymy)
Chitinopoma groenlandica sensu Hartman, 1948 (non Mörch, 1863) accepted as Chitinopoma serrula (Stimpson, 1853) (additional source)
Chone duneri Malmgren, 1867 (additional source)
Chone fauveli McIntosh, 1916 (source of synonymy)
Chone infundibuliformis Krøyer, 1856 (additional source)
Chone longocirrata M. Sars in G.O. Sars, 1872 accepted as Chone duneri Malmgren, 1867 (source of synonymy)
Cirratulus chrysoderma Claparède, 1868 accepted as Protocirrineris chrysoderma (Claparède, 1868) (source of synonymy)
Cirratulus filiformis Keferstein, 1862 accepted as Aphelochaeta filiformis (Keferstein, 1862) (additional source)
Cirratulus flavescens Johnston, 1825 accepted as Cirratulus cirratus (O. F. Müller, 1776) (additional source)
Cirrhineris Blainville, 1828 (status source)
Cirriformia chrysoderma (Claparède, 1868) accepted as Protocirrineris chrysoderma (Claparède, 1868) (basis of record)
Cirriformia filigera (Delle Chiaje, 1828) (additional source)
Cirriformia semicincta (Ehlers, 1905) (additional source)
Cirriformia tentaculata (Montagu, 1808) (source of synonymy)
Cirrophorus furcatus (Hartman, 1957) (additional source)
Cistenides granulata (Linnaeus, 1767) (additional source)
Clymene lophoseta Orlandi, 1898 accepted as Praxillella affinis (M. Sars in G.O. Sars, 1872) (source of synonymy)
Clymenura borealis (Arwidsson, 1906) (additional source)
Clymenura clypeata (Saint-Joseph, 1894) accepted as Leiochone leiopygos (Grube, 1860) (additional source)
Crithida thalassina Gosse, 1855 (source of synonymy)
Cystonereis edwardsii Kölliker in Koch, 1846 accepted as Exogone edwardsii (Kölliker in Koch, 1846) (source of synonymy)
Dalhousia McIntosh, 1885 (status source)
Dasybranchus caducus (Grube, 1846) (additional source)
Ditrupa arietina (O. F. Müller, 1776) (additional source)
Dodecaceria concharum Örsted, 1843 (additional source)
Dorvillea roemeri (Augener, 1912) (basis of record)
Drilonereis filum (Claparède, 1868) (additional source)
Enapteris euchaeta Chun, 1888 (additional source)
Epidiopatra Augener, 1918 accepted as Diopatra Audouin & Milne Edwards, 1833 (subsequent type designation)
Escholtzia leuckartii Quatrefages, 1866 accepted as Tomopteris apsteini Rosa, 1908 represented as Tomopteris (Johnstonella) apsteini (Rosa, 1908) (source of synonymy)