Acholoe Claparède, 1870 (additional source)
Acholoe squamosa (Delle Chiaje, 1827) (additional source)
Admetella McIntosh, 1885 (additional source)
Admetella longipedata (McIntosh, 1885) (basis of record)
Aglaophamus Kinberg, 1866 (additional source)
Alciopa Audouin & Milne Edwards, 1833 (additional source)
Alciopina Claparède & Panceri, 1867 (additional source)
Alciopini Ehlers, 1864 (additional source)
Alkmaria Horst, 1919 (additional source)
Alkmaria romijni Horst, 1919 (additional source)
Allmaniella McIntosh, 1885 (additional source)
Amblyosyllis Grube, 1857 (additional source)
Ampharete Malmgren, 1866 (additional source)
Ampharetidae Malmgren, 1866 (additional source)
Amphicteis Grube, 1850 (additional source)
Amphiglena Claparède, 1864 (additional source)
Amphinome Bruguière, 1789 (additional source)
Amphinome incarunculata Peters, 1854 accepted as Linopherus incarunculata (Peters, 1854) (basis of record)
Amphinome incarunculata Peters, 1854 accepted as Linopherus incarunculata (Peters, 1854) (source of synonymy)
Amphinome rostrata (Pallas, 1766) (additional source)
Amphinomida (basis of record)
Amphinomidae Lamarck, 1818 (additional source)
Amphitrite Müller, 1771 (additional source)
Amphitritinae Malmgren, 1866 accepted as Terebellinae Johnston, 1846 (basis of record)
Anaitides Czerniavsky, 1882 accepted as Phyllodoce Lamarck, 1818 (basis of record)
Ancistrosyllis McIntosh, 1878 (additional source)
Anomalorbis Vine, 1972 (basis of record)
Aonides Claparède, 1864 (additional source)
Aonides oxycephala (Sars, 1862) (additional source)
Aphrodita Linnaeus, 1758 (additional source)
Aphroditidae Malmgren, 1867 (additional source)
Aphroditiformia (additional source)
Apomatus Philippi, 1844 (additional source)
Arabella Grube, 1850 (additional source)
Arabella iricolor (Montagu, 1804) (additional source)
Arabellidae Hartman, 1944 accepted as Oenonidae Kinberg, 1865 (additional source)
Arenicola Lamarck, 1801 (additional source)
Arenicolidae Johnston, 1835 (additional source)
Aricia Savigny, 1822 accepted as Orbinia Quatrefages, 1866 (additional source)
Aricidea Webster, 1879 (additional source)
Armandia Filippi, 1861 (additional source)
Asclerocheilus Ashworth, 1901 (additional source)
Audouinia Quatrefages, 1866 accepted as Cirriformia Hartman, 1936 (additional source)
Audouinia filigera (Delle Chiaje, 1828) accepted as Cirriformia filigera (Delle Chiaje, 1828) (source of synonymy)
Augeneria Monro, 1930 (additional source)
Austrolaenilla Bergström, 1916 (additional source)
Autolytinae Langerhans, 1879 (additional source)
Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845 (additional source)
Axiothea Malmgren, 1865 accepted as Axiothella Verrill, 1900 (basis of record)
Axiothea Malmgren, 1865 accepted as Axiothella Verrill, 1900 (source of synonymy)
Axiothella Verrill, 1900 (additional source)
Bhawania Schmarda, 1861 (additional source)
Bispira Krøyer, 1856 (additional source)
Boccardia Carazzi, 1893 (additional source)
Brada Stimpson, 1853 (additional source)
Branchiosyllis Ehlers, 1887 (additional source)
Brania Quatrefages, 1866 (additional source)
Capitella Blainville, 1828 (additional source)
Capitellida (basis of record)
Capitellidae Grube, 1862 (taxonomy source)
Capitomastus Eisig, 1887 accepted as Capitella Blainville, 1828 (status source)
Capitomastus minimus (Langerhans, 1880) accepted as Capitella minima Langerhans, 1880 (basis of record)
Caulleriella Chamberlin, 1919 (additional source)
Chaetopteridae Audouin & Milne Edwards, 1833 (additional source)
Chaetopteriformia (basis of record)
Chaetopterus Cuvier, 1830 (additional source)
Chaetozone Malmgren, 1867 (additional source)
Chaetozone setosa Malmgren, 1867 (additional source)
Chitinopoma Levinsen, 1884 (additional source)
Chone Krøyer, 1856 (additional source)
Chrysopetalacea (basis of record)
Chrysopetalidae Ehlers, 1864 (additional source)
Chrysopetalum Ehlers, 1864 (additional source)
Chrysopetalum debile (Grube, 1855) (additional source)
Cirratulidae Ryckholt, 1851 (additional source)
Cirratuliformia (basis of record)
Cirratulus Lamarck, 1818 (additional source)
Cirriformia Hartman, 1936 (additional source)
Cirrophorus Ehlers, 1908 (additional source)
Clymene Lamarck, 1818 (basis of record)
Clymene Lamarck, 1818 (additional source)
Clymene oerstedii Claparède, 1863 accepted as Euclymene oerstedii (Claparède, 1863) (additional source)
Clymenella Verrill, 1873 (additional source)
Clymenura Verrill, 1900 (additional source)
Cossura Webster & Benedict, 1887 (additional source)
Cossuridae Day, 1963 (additional source)
Crucigera Benedict, 1887 (basis of record)
Ctenodrilida (basis of record)
Ctenodrilus Claparède, 1863 (additional source)
Dasybranchus Grube, 1850 (additional source)
Dasychone Sars, 1862 accepted as Branchiomma Kölliker, 1858 (additional source)
Demonax Kinberg, 1867 accepted as Parasabella Bush, 1905 (additional source)
Diopatra Audouin & Milne Edwards, 1833 (additional source)
Diplocirrus Haase, 1915 (additional source)
Dipolydora Verrill, 1881 (additional source)
Ditrupa Berkeley, 1835 (additional source)
Dodecaceria Örsted, 1843 (additional source)
Dorvillea Parfitt, 1866 (additional source)
Dorvilleidae Chamberlin, 1919 (additional source)
Drilonereis Claparède, 1870 (additional source)