Abarenicola pacifica Healy & Wells, 1959 (additional source)
Acoetes flagelliformis (Wesenberg-Lund, 1949) (additional source)
Acoetes grubei (Kinberg, 1856) (additional source)
Acoetes jogasimae (Izuka, 1912) (additional source)
Acoetes melanonota (Grube, 1876) (additional source)
Acrocirrus validus Marenzeller, 1879 (additional source)
Aglaophamus dibranchis (Grube, 1877) (additional source)
Aglaophamus dicirris Hartman, 1945 accepted as Aglaophamus verrilli (McIntosh, 1885) (additional source)
Aglaophamus gippslandicus Rainer & Hutchings, 1977 (additional source)
Aglaophamus jeffreysii (McIntosh, 1885) (additional source)
Aglaophamus lobatus Imajima & Takeda, 1985 (additional source)
Aglaophamus lyrochaeta (Fauvel, 1902) (additional source)
Aglaophamus macroura (Schmarda, 1861) (additional source)
Aglaophamus munamaorii (Gibbs, 1971) (additional source)
Aglaophamus orientalis Fauchald, 1968 (additional source)
Aglaophamus phuketensis Nateewathana & Hylleberg, 1986 (additional source)
Aglaophamus sinensis (Fauvel, 1932) (additional source)
Aglaophamus tepens Fauchald, 1968 (additional source)
Aglaophamus toloensis Ohwada, 1992 (additional source)
Aglaophamus vietnamensis Fauchald, 1968 (additional source)
Alciopina parasitica Claparède & Panceri, 1867 (additional source)
Amaeana accraensis (Augener, 1918) (additional source)
Amaeana antipoda (Augener, 1926) (additional source)
Amaeana occidentalis (Hartman, 1944) (additional source)
Amaeana trilobata (Sars, 1863) (additional source)
Amblyosyllis speciosa Izuka, 1912 (additional source)
Ampharete acutifrons (Grube, 1860) (additional source)
Ampharete arctica Malmgren, 1866 accepted as Ampharete finmarchica (M. Sars, 1865) (additional source)
Ampharete reducta Chamberlin, 1920 (additional source)
Amphicteis glabra Moore, 1906 (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphicteis mederi Annenkova, 1929 (additional source)
Amphicteis scaphobranchiata Moore, 1906 (additional source)
Amphictene japonica (Nilsson, 1928) (additional source)
Amphinome pulchra Horst, 1912 accepted as Amphinome jukesi Baird, 1868 (additional source)
Amphinome rostrata (Pallas, 1766) (additional source)
Amphisamytha japonica Hessle, 1917 (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Amphitrite oculata Hessle, 1917 (additional source)
Amphitrite ramosissima Marenzeller, 1884 accepted as Neoamphitrite ramosissima (Marenzeller, 1884) (additional source)
Ancistrosyllis groenlandica McIntosh, 1878 (additional source)
Ancistrosyllis pilargiformis Uschakov & Wu, 1962 accepted as Cabira pilargiformis (Uschakov & Wu, 1962) (additional source)
Anelassorhynchus inansensis (Ikeda, 1904) (additional source)
Anelassorhynchus sabinus (Lanchester, 1905) (additional source)
Antiobactrum brasiliensis (Hansen, 1882) (additional source)
Aonides oxycephala (Sars, 1862) (additional source)
Aphrodita australis Baird, 1865 (additional source)
Aphrodita japonica Marenzeller, 1879 (additional source)
Aphrodita talpa Quatrefages, 1866 (additional source)
Aphroditella sibogae Horst, 1916 accepted as Aphrodita sibogae (Horst, 1916) (additional source)
Apomatus enosimae Marenzeller, 1884 (additional source)
Apoprionospio pygmaea (Hartman, 1961) (additional source)
Arabella (Arabella) iricolor (Montagu, 1804) accepted as Arabella iricolor (Montagu, 1804) (additional source)
Arabella mutans (Chamberlin, 1919) (additional source)
Arabella novecrinita Crossland, 1924 accepted as Arabella mutans (Chamberlin, 1919) (additional source)
Arctonoella sinagawaensis (Izuka, 1912) (additional source)
Arenicola brasiliensis Nonato, 1958 (additional source)
Arhynchite rugosus Chen & Yeh, 1958 (additional source)
Aricidea (Acmira) finitima Strelzov, 1973 (additional source)
Aricidea (Acmira) simplex Day, 1963 (additional source)
Aricidea (Aedicira) pacifica Hartman, 1944 (additional source)
Aricidea (Allia) belgicae (Fauvel, 1936) accepted as Aricidea (Strelzovia) belgicae (Fauvel, 1936) (additional source)
Aricidea (Allia) facilis Strelzov, 1973 accepted as Aricidea (Strelzovia) facilis Strelzov, 1973 (additional source)
Aricidea (Allia) pulchra Strelzov, 1973 accepted as Aricidea (Strelzovia) pulchra Strelzov, 1973 (additional source)
Aricidea (Aricidea) capensis Day, 1961 (additional source)
Aricidea (Aricidea) curviseta Day, 1963 (additional source)
Aricidea (Aricidea) fragilis Webster, 1879 (additional source)
Aricidea claudiae Laubier, 1967 represented as Aricidea (Strelzovia) claudiae Laubier, 1967 (additional source)
Aricidea nolani Webster & Benedict, 1887 (additional source)
Aricidea quadrilobata Webster & Benedict, 1887 represented as Aricidea (Strelzovia) quadrilobata Webster & Benedict, 1887 (additional source)
Armandia intermedia Fauvel, 1902 (additional source)
Armandia lanceolata Willey, 1905 (additional source)
Armandia leptocirris (Grube, 1878) (additional source)
Armandia longicaudata (Caullery, 1944) accepted as Ophelina longicaudata (Caullery, 1944) (additional source)
Artacama proboscidea Malmgren, 1866 (additional source)
Asychis disparidentata (Moore, 1904) accepted as Metasychis disparidentatus (Moore, 1904) (additional source)
Asychis gangeticus Fauvel, 1932 accepted as Sabaco gangeticus (Fauvel, 1932) (additional source)
Asychis gotoi (Izuka, 1902) accepted as Metasychis gotoi (Izuka, 1902) (additional source)
Asychis pigmentata Imajima & Shiraki, 1982 (additional source)
Auchenoplax crinita Ehlers, 1887 (additional source)
Australonoe willani Hanley, 1993 (additional source)
Autolytus (Autolytus) magnus (Berkeley, 1923) (additional source)
Autolytus pictus (Ehlers, 1864) accepted as Proceraea picta Ehlers, 1864 (additional source)
Autolytus purpureimaculata Okada, 1933 accepted as Myrianida pachycera (Augener, 1913) (additional source)
Autolytus robustisetus Wu & Sun in Sun, 1978 (additional source)
Axiothella australis Augener, 1914 (additional source)
Axiothella rubrocincta (Johnson, 1901) (additional source)
Bhawania brevis Gallardo, 1968 accepted as Paleaequor breve (Gallardo, 1968) (additional source)
Bhawania cryptocephala Gravier, 1901 (additional source)
Bhawania goodei Webster, 1884 (additional source)
Boccardia polybranchia (Haswell, 1885) (additional source)
Boccardia proboscidea Hartman, 1940 (additional source)
Boccardiella hamata (Webster, 1879) (additional source)
Brada ferruginea Gallardo, 1968 accepted as Pycnoderma ferruginea (Gallardo, 1968) (additional source)
Brada mammillata Grube, 1877 accepted as Bradabyssa mammillata (Grube, 1877) (additional source)
Brada talehsapensis Fauvel, 1932 accepted as Pycnoderma talehsapensis (Fauvel, 1932) (additional source)
Brada villosa (Rathke, 1843) accepted as Bradabyssa villosa (Rathke, 1843) (additional source)
Branchiomma cingulatum (Grube, 1870) (additional source)
Branchiomma nigromaculatum (Baird, 1865) (additional source)
Branchiomma orientalis (McIntosh, 1885) accepted as Pseudobranchiomma orientalis (McIntosh, 1885) (additional source)