Abyssoninoe Orensanz, 1990 (additional source)
Aglaophamus malmgreni (Théel, 1879) (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)
Amage gallasii Marion, 1876 accepted as Amage gallasii Marion, 1875 (basis of record)
Amagopsis Pergament & Khlebovich, 1964 accepted as Grubianella McIntosh, 1885 (additional source)
Amagopsis klugei Pergament & Khlebovich, 1964 accepted as Grubianella klugei (Pergament & Khlebovich, 1964) (additional source)
Amblyosyllis Grube, 1857 (basis of record)
Amblyosyllis finmarchica (Malmgren, 1867) (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 goesi Malmgren, 1866 (basis of record)
Ampharete lindstroemi Hessle, 1917 (basis of record)
Ampharete vega (Wirén, 1883) (basis of record)
Amphicteis Grube, 1850 (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphicteis ninonae Jirkov, 1985 (basis of record)
Amphicteis sundevalli Malmgren, 1866 (basis of record)
Amphitrite Müller, 1771 (additional source)
Amphitrite cirrata Müller, 1776 (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 marioni (Saint-Joseph, 1894) (basis of record)
Apistobranchus Levinsen, 1884 (additional source)
Apistobranchus tullbergi (Théel, 1879) (additional source)
Apomatus Philippi, 1844 (basis of record)
Apomatus similis Marion & Bobretzky, 1875 (basis of record)
Arenicola Lamarck, 1801 (additional source)
Arenicola cristata Stimpson, 1856 (basis of record)
Arenicola marina (Linnaeus, 1758) (basis of record)
Arenotrocha Westheide & von Nordheim, 1985 (additional source)
Arenotrocha minuta (Lévi, 1954) (additional source)
Aricidea Webster, 1879 (additional source)
Aricidea abranchiata Hartman, 1965 (basis of record)
Aricidea catherinae Laubier, 1967 represented as Aricidea (Acmira) catherinae Laubier, 1967 (basis of record)
Aricidea hartmani Strelzov, 1968 (basis of record)
Aricidea quadrilobata Webster & Benedict, 1887 represented as Aricidea (Strelzovia) quadrilobata Webster & Benedict, 1887 (basis of record)
Artacama Malmgren, 1866 (basis of record)
Artacama proboscidea Malmgren, 1866 (basis of record)
Augeneria Monro, 1930 (additional source)
Augeneria algida (Wirén, 1901) (additional source)
Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845 (additional source)
Autolytus alexandri Malmgren, 1867 accepted as Epigamia alexandri (Malmgren, 1867) (basis of record)
Autolytus prismaticus (O.F. Müller, 1776) accepted as Proceraea prismatica (O.F. Müller, 1776) (basis of record)
Autolytus prolifer (O. F. Müller, 1788) accepted as Myrianida prolifera (O.F. Müller, 1788) (additional source)
Autolytus verrilli Marenzeller, 1892 accepted as Epigamia alexandri (Malmgren, 1867) (basis of record)
Axionice Malmgren, 1866 (additional source)
Axionice flexuosa (Grube, 1860) (basis of record)
Axionice maculata (Dalyell, 1853) accepted as Pista maculata (Dalyell, 1853) (additional source)
Axiothella Verrill, 1900 (basis of record)
Axiothella catenata (Malmgren, 1865) (basis of record)
Baffinia Wesenberg-Lund, 1950 (basis of record)
Baffinia hesslei (Annenkova-Chlopina, 1924) (basis of record)
Bathyfauvelia Pettibone, 1976 (additional source)
Bathyfauvelia affinis (Fauvel, 1914) (basis of record)
Bispira Krøyer, 1856 (additional source)
Bispira crassicornis (Sars, 1851) (basis of record)
Bispira fabricii (Krøyer, 1856) (basis of record)
Boccardia Carazzi, 1893 (basis of record)
Boccardia polybranchia (Haswell, 1885) (basis of record)
Brada Stimpson, 1853 (additional source)
Brada granulosa Hansen, 1880 (additional source)
Brada incrustata Støp-Bowitz, 1948 (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)
Branchiomma infarctum (Krøyer, 1856) (basis of record)
Bushiella Knight-Jones, 1973 (basis of record)
Bylgides annenkovae Pettibone, 1993 (basis of record)
Bylgides elegans (Théel, 1879) (basis of record)
Bylgides groenlandicus (Malmgren, 1867) (basis of record)
Bylgides promamme (Malmgren, 1867) (basis of record)
Capitella Blainville, 1828 (additional source)
Capitella capitata (Fabricius, 1780) (basis of record)
Capitella minima Langerhans, 1880 (additional source)
Ceratocephale Malmgren, 1867 (additional source)
Ceratocephale loveni Malmgren, 1867 (basis of record)
Ceratonereis Kinberg, 1865 (basis of record)
Chaetozone Malmgren, 1867 (additional source)
Chaetozone abranchiata (G.A. Hansen, 1878) (basis of record)
Chaetozone setosa Malmgren, 1867 (additional source)
Chirimia Light, 1991 (additional source)
Chirimia biceps (M. Sars, 1861) (additional source)
Chitinopoma Levinsen, 1884 (basis of record)
Chitinopoma serrula (Stimpson, 1853) (basis of record)
Chone duneri Malmgren, 1867 (basis of record)
Chone filicaudata Southern, 1914 (basis of record)
Chone infundibuliformis Krøyer, 1856 (basis of record)
Chone paucibranchiata (Krøyer, 1856) (basis of record)