Abarenicola Wells, 1959 (basis of record)
Acholoe Claparède, 1870 (additional source)
Aglaophamus malmgreni (Théel, 1879) (basis of record)
Alciopa Audouin & Milne Edwards, 1833 (additional source)
Alciopa reynaudii Audouin & H Milne Edwards, 1833 (additional source)
Alciopina Claparède & Panceri, 1867 (additional source)
Alciopina parasitica Claparède & Panceri, 1867 (additional source)
Alkmaria Horst, 1919 (basis of record)
Alkmaria romijni Horst, 1919 (additional source)
Amblyosyllis Grube, 1857 (basis of record)
Amblyosyllis formosa (Claparède, 1863) accepted as Amblyosyllis spectabilis (Johnston in Baird, 1861) (basis of record)
Amblyosyllis lineolata (A. Costa, 1864) accepted as Amblyosyllis spectabilis (Johnston in Baird, 1861) (basis of record)
Ampharete Malmgren, 1866 (additional source)
Ampharete acutifrons (Grube, 1860) (additional source)
Amphicteis Grube, 1850 (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphiglena Claparède, 1864 (additional source)
Amphiglena mediterranea (Leydig, 1851) (basis of record)
Amphinome Bruguière, 1789 (additional source)
Amphinome rostrata (Pallas, 1766) (additional source)
Amphitrite Müller, 1771 (additional source)
Amphitrite orotavae Langerhans, 1881 accepted as Terebella orotavae (Langerhans, 1881) (basis of record)
Amphitrite rubra (Risso, 1826) (additional source)
Ancistrosyllis McIntosh, 1878 (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)
Aphelochaeta marioni (Saint-Joseph, 1894) (basis of record)
Aphrodita perarmata Roule, 1898 (basis of record)
Apomatus Philippi, 1844 (basis of record)
Aponuphis Kucheruk, 1978 (additional source)
Aponuphis bilineata (Baird, 1870) (additional source)
Aponuphis brementi (Fauvel, 1916) (additional source)
Aponuphis ornata (Fauvel, 1928) (additional source)
Arabella iricolor (Montagu, 1804) (basis of record)
Arenicola Lamarck, 1801 (additional source)
Arenicola marina (Linnaeus, 1758) (basis of record)
Arenotrocha Westheide & von Nordheim, 1985 (additional source)
Aricidea Webster, 1879 (additional source)
Aricidea assimilis Tebble, 1959 represented as Aricidea (Acmira) assimilis Tebble, 1959 (basis of record)
Aricidea fauveli Hartman, 1957 accepted as Aricidea (Acmira) lopezi Berkeley & Berkeley, 1956 (additional source)
Armandia Filippi, 1861 (additional source)
Asclerocheilus Ashworth, 1901 (basis of record)
Augeneria Monro, 1930 (additional source)
Augeneriella Banse, 1957 (basis of record)
Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845 (additional source)
Autolytus longoprimicirratus López, San Martín & Jiménez, 1997 accepted as Myrianida longoprimicirrata (López, San Martín & Jiménez, 1997) (basis of record)
Autolytus pictus (Ehlers, 1864) accepted as Proceraea picta Ehlers, 1864 (basis of record)
Autolytus prolifer (O. F. Müller, 1788) accepted as Myrianida prolifera (O.F. Müller, 1788) (additional source)
Axiothella Verrill, 1900 (basis of record)
Bhawania Schmarda, 1861 (additional source)
Bhawania goodei Webster, 1884 (basis of record)
Bispira Krøyer, 1856 (additional source)
Boccardia Carazzi, 1893 (basis of record)
Brada Stimpson, 1853 (additional source)
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 luctuosum (Grube, 1870) (additional source)
Branchiomma lucullanum (Delle Chiaje, 1828) (basis of record)
Branchiosyllis Ehlers, 1887 (basis of record)
Branchiosyllis exilis (Gravier, 1900) (additional source)
Brania Quatrefages, 1866 (additional source)
Brania arminii (Langerhans, 1881) (basis of record)
Bushiella Knight-Jones, 1973 (basis of record)
Capitella Blainville, 1828 (additional source)
Capitella capitata (Fabricius, 1780) (basis of record)
Capitella giardi (Mesnil, 1897) (additional source)
Capitella minima Langerhans, 1880 (additional source)
Capitellethus Chamberlin, 1919 (additional source)
Capitellethus dispar (Ehlers, 1907) (additional source)
Caulleriella Chamberlin, 1919 (additional source)
Caulleriella alata (Southern, 1914) (additional source)
Ceratonereis Kinberg, 1865 (basis of record)
Ceratonereis costae (Grube, 1840) accepted as Composetia costae (Grube, 1840) (basis of record)
Ceratonereis hircinicola (Eisig, 1869) accepted as Composetia hircinicola (Eisig, 1869) (basis of record)
Ceratonereis mirabilis Kinberg, 1865 (additional source)
Chaetopterus Cuvier, 1830 (additional source)
Chaetopterus variopedatus (Renier, 1804) (basis of record)
Chaetozone Malmgren, 1867 (additional source)
Chaetozone caputesocis (Saint-Joseph, 1894) (additional source)
Chaetozone setosa Malmgren, 1867 (additional source)
Chitinopoma Levinsen, 1884 (basis of record)
Chloeia Lamarck, 1818 (additional source)
Chone collaris Langerhans, 1880 accepted as Dialychone collaris (Langerhans, 1880) (basis of record)
Chone duneri Malmgren, 1867 (basis of record)
Chrysopetalum Ehlers, 1864 (basis of record)
Chrysopetalum debile (Grube, 1855) (basis of record)
Cirratulus Lamarck, 1818 (additional source)
Cirratulus chrysoderma Claparède, 1868 accepted as Protocirrineris chrysoderma (Claparède, 1868) (additional source)
Cirratulus cirratus (O. F. Müller, 1776) (additional source)
Cirriformia Hartman, 1936 (additional source)
Cirriformia semicincta (Ehlers, 1905) (basis of record)
Cirriformia tentaculata (Montagu, 1808) (basis of record)
Cirrophorus Ehlers, 1908 (basis of record)
Claparedepelogenia Pettibone, 1997 (basis of record)
Claparedepelogenia inclusa (Claparède, 1868) (basis of record)
Clymenella Verrill, 1873 (basis of record)