Abyssinoe [auct.] accepted as Abyssoninoe Orensanz, 1990 (basis of record)
Abyssoninoe Orensanz, 1990 (additional source)
Aglaophamus agilis (Langerhans, 1880) (basis of record)
Aglaophamus malmgreni (Théel, 1879) (basis of record)
Aglaophamus rubella (Michaelsen, 1897) accepted as Aglaophamus agilis (Langerhans, 1880) (basis of record)
Amaeana Hartman, 1959 (additional source)
Amaeana trilobata (Sars, 1863) (additional source)
Amage Malmgren, 1866 (additional source)
Amage auricula Malmgren, 1866 (basis of record)
Amblyosyllis Grube, 1857 (basis of record)
Amblyosyllis formosa (Claparède, 1863) accepted as Amblyosyllis spectabilis (Johnston in Baird, 1861) (basis of record)
Ampharete Malmgren, 1866 (additional source)
Ampharete acutifrons (Grube, 1860) (additional source)
Ampharete baltica Eliason, 1955 (additional source)
Ampharete falcata Eliason, 1955 (basis of record)
Ampharete finmarchica (M. Sars, 1865) (basis of record)
Ampharete lindstroemi Hessle, 1917 (basis of record)
Amphicteis Grube, 1850 (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphicteis midas (Gosse, 1855) (additional source)
Amphitrite Müller, 1771 (additional source)
Amphitrite cirrata Müller, 1776 (basis of record)
Amythasides Eliason, 1955 (additional source)
Amythasides macroglossus Eliason, 1955 (basis of record)
Anobothrus Levinsen, 1884 (additional source)
Anobothrus gracilis (Malmgren, 1866) (additional source)
Aonides Claparède, 1864 (additional source)
Aonides oxycephala (Sars, 1862) (basis of record)
Aonides paucibranchiata Southern, 1914 (basis of record)
Aphelochaeta Blake, 1991 (additional source)
Aphelochaeta filiformis (Keferstein, 1862) (basis of record)
Apistobranchus Levinsen, 1884 (additional source)
Apistobranchus tenuis Orrhage, 1962 (basis of record)
Apistobranchus tullbergi (Théel, 1879) (additional source)
Apomatus Philippi, 1844 (basis of record)
Apomatus similis Marion & Bobretzky, 1875 (basis of record)
Aponuphis Kucheruk, 1978 (additional source)
Aponuphis bilineata (Baird, 1870) (additional source)
Arabella iricolor (Montagu, 1804) (basis of record)
Arenicola Lamarck, 1801 (additional source)
Arenicola marina (Linnaeus, 1758) (basis of record)
Aricidea Webster, 1879 (additional source)
Aricidea albatrossae Pettibone, 1957 represented as Aricidea (Aricidea) albatrossae Pettibone, 1957 (basis of record)
Aricidea catherinae Laubier, 1967 represented as Aricidea (Acmira) catherinae Laubier, 1967 (basis of record)
Aricidea cerrutii Laubier, 1966 represented as Aricidea (Acmira) cerrutii Laubier, 1966 (basis of record)
Aricidea laubieri Hartley, 1981 represented as Aricidea (Acmira) laubieri Hartley, 1981 (basis of record)
Aricidea minuta Southward, 1956 represented as Aricidea (Aricidea) minuta Southward, 1956 (basis of record)
Aricidea roberti Hartley, 1983 represented as Aricidea (Strelzovia) roberti Hartley, 1984 (basis of record)
Aricidea simonae Laubier & Ramos, 1974 represented as Aricidea (Acmira) simonae Laubier & Ramos, 1974 (basis of record)
Aricidea suecica Eliason, 1920 represented as Aricidea (Strelzovia) suecica Eliason, 1920 (additional source)
Aricidea wassi Pettibone, 1965 represented as Aricidea (Aricidea) wassi Pettibone, 1965 (basis of record)
Asclerocheilus Ashworth, 1901 (basis of record)
Asclerocheilus intermedius (Saint-Joseph, 1894) (basis of record)
Atherospio Mackie & Duff, 1986 (additional source)
Augeneria Monro, 1930 (additional source)
Augeneria tentaculata Monro, 1930 (additional source)
Aurospio Maciolek, 1981 (additional source)
Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845 (additional source)
Autolytus inermis Saint-Joseph, 1887 accepted as Myrianida inermis (Saint Joseph, 1887) (basis of record)
Autolytus prolifer (O. F. Müller, 1788) accepted as Myrianida prolifera (O.F. Müller, 1788) (additional source)
Axionice Malmgren, 1866 (additional source)
Axionice maculata (Dalyell, 1853) accepted as Pista maculata (Dalyell, 1853) (additional source)
Axiothella Verrill, 1900 (basis of record)
Boccardiella Blake & Kudenov, 1978 (basis of record)
Brada Stimpson, 1853 (additional source)
Brada inhabilis (Rathke, 1843) (basis of record)
Brada villosa (Rathke, 1843) accepted as Bradabyssa villosa (Rathke, 1843) (basis of record)
Branchiomma Kölliker, 1858 (additional source)
Branchiomma bombyx (Dalyell, 1853) (basis of record)
Brania Quatrefages, 1866 (additional source)
Capitella Blainville, 1828 (additional source)
Capitella capitata (Fabricius, 1780) (basis of record)
Capitella giardi (Mesnil, 1897) (additional source)
Capitella minima Langerhans, 1880 (additional source)
Caulleriella Chamberlin, 1919 (additional source)
Caulleriella alata (Southern, 1914) (additional source)
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 (basis of record)
Ceratocephale Malmgren, 1867 (additional source)
Ceratocephale loveni Malmgren, 1867 (basis of record)
Chaetoparia Malmgren, 1867 (basis of record)
Chaetoparia nilssoni Malmgren, 1867 (basis of record)
Chaetopterus Cuvier, 1830 (additional source)
Chaetopterus variopedatus (Renier, 1804) (basis of record)
Chaetozone Malmgren, 1867 (additional source)
Chaetozone gibber Woodham & Chambers, 1994 (basis of record)
Chaetozone setosa Malmgren, 1867 (additional source)
Chirimia Light, 1991 (additional source)
Chirimia biceps (M. Sars, 1861) (additional source)
Chone duneri Malmgren, 1867 (basis of record)
Chone fauveli McIntosh, 1916 (basis of record)
Chone filicaudata Southern, 1914 (basis of record)
Chone infundibuliformis Krøyer, 1856 (basis of record)
Chone longocirrata M. Sars in G.O. Sars, 1872 accepted as Chone duneri Malmgren, 1867 (basis of record)
Chrysopetalum Ehlers, 1864 (basis of record)
Chrysopetalum debile (Grube, 1855) (basis of record)
Circeis Saint-Joseph, 1894 (additional source)
Circeis spirillum (Linnaeus, 1758) (basis of record)
Cirratulus Lamarck, 1818 (additional source)

 Taxonomy

 for Notoproctus oculatus Arwidsson, 1906

?= Notoproctus oculatus Arwidsson, 1907, Maldanidae [details]