• Acritagasyllis Lucas, San Martín & Sikorski, 2010
• Acritagasyllis longichaetosus Lucas, San Martin & Sikorski, 2010
• Alcyonosyllis Glasby & Watson, 2001
• Alcyonosyllis glasbyi San Martin & Nishi, 2003
• Alcyonosyllis phili Glasby & Watson, 2001
• Alcyonosyllis xeniaecola (Hartmann-Schröder, 1993)
• Alluandella Chamberlin, 1919 accepted as Alluaudella Gravier, 1905 accepted as Odontosyllis Claparède, 1863
• Alluaudella Gravier, 1905 accepted as Odontosyllis Claparède, 1863
• Alluaudella longicirrata Mohammad, 1973
• Alluaudella madagascariensis Gravier, 1905
• Ambliosyllis Quatrefages, 1865 accepted as Amblyosyllis Grube, 1857
• Amblosyllis Grube, 1857
• Amblosyllis vesiculosa Hartmann-Schröder, 1989
• Amblyosillis Eisig, 1881 accepted as Amblyosyllis Grube, 1857
• Amblyosillis Grube, 1857 accepted as Amblyosyllis Grube, 1857
• Amblyosillis algefnae Viguier, 1886 accepted as Amblyosyllis formosa (Claparède, 1863)
• Amblyosillis plectorhyncha Marenzeller, 1874 accepted as Amblyosyllis formosa (Claparède, 1863)
• Amblyosyllis Grube, 1857
• Amblyosyllis algefnae Viguier, 1886 accepted as Amblyosyllis formosa (Claparède, 1863)
• Amblyosyllis cincinnata (Verrill, 1874)
• Amblyosyllis dorsigera Claparède, 1864
• Amblyosyllis enigmatica San Martin & Hutchings, 2006
• Amblyosyllis finmarchica (Malmgren, 1867)
• Amblyosyllis formosa (Claparède, 1863)
• Amblyosyllis granosa Ehlers, 1897
• Amblyosyllis immatura Langerhans, 1879
• Amblyosyllis infuscata Ehlers, 1901 accepted as Dioplosyllis infuscata (Ehlers, 1901)
• Amblyosyllis inmatura Langerhans, 1879 accepted as Amblyosyllis formosa (Claparède, 1863)
• Amblyosyllis inmaturata Langerhans, 1879
• Amblyosyllis lineata Grube, 1863
• Amblyosyllis lineolata (A. Costa, 1864)
• Amblyosyllis madeirensis Langerhans, 1879
• Amblyosyllis multidenticulata San Martin & Hutchings, 2006
• Amblyosyllis nigrolineata Okada, 1934 accepted as Amblyosyllis speciosa Izuka, 1912
• Amblyosyllis rhombeata Grube, 1857
• Amblyosyllis speciosa Izuka, 1912
• Amblyosyllis vesiculosa Hartmann-Schröder, 1989
• Amytidea Parfitt, 1867 (unaccepted)
• Amytis Savigny, 1822 accepted as Proceraea Ehlers, 1864
• Amytis prismatica (O.F. Müller, 1776) accepted as Proceraea prismatica (O.F. Müller, 1776)
• Anaplosyllis Chamberlin, 1919 (unaccepted)
• Anguillosyllis Day, 1963
• Anguillosyllis capensis Day, 1963
• Anopllosylis Webster & Benedict, 1887 (unaccepted)
• Anoplosyllis Claparède, 1868
• Anoplosyllis edentula Claparède, 1868 accepted as Syllides edentula (Claparède, 1868)
• Anoplosyllis fulva Marion & Bobretzky, 1875
• Antolytides Malaquin, 1893 (uncertain)
• Antolytus Gervais & Beneden, 1859 accepted as Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845
• Aporosyllis Quatrefages, 1865 (unaccepted > nomen nudum)
• Aporosyllis Quatrefages, 1866 accepted as Syllis Savigny in Lamarck, 1818
• Astreptosyllis Kudenov & Dorsey, 1982
• Astreptosyllis acrassiseta Kudenov & Dorsey, 1982
• Astreptosyllis similiseta Hartmann-Schröder, 1986
• Atelesyllis Pruvot, 1930 accepted as Odontosyllis Claparède, 1863
• Atelesyllis rubrofasciata Pruvot, 1930
• Autolytides Malaquin, 1893 accepted as Myrianida Milne Edwards, 1845
• Autolytur accepted as Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845
• Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845
• Autolytus afer Ehlers, 1908 accepted as Epigamia charcoti (Gravier, 1906)
• Autolytus agassizii Quatrefages, 1866 accepted as Myrianida prolifera (O.F. Müller, 1788)
• Autolytus alexandri Malmgren, 1867
• Autolytus alternata Imajima & Hartman, 1964
• Autolytus anoplos (Monro, 1933)
• Autolytus antondohrni Çinar & Gambi, 2005 accepted as Myrianida antondohrni (Çinar & Gambi, 2005)
• Autolytus aurantiacus (Claparède, 1868)
• Autolytus australiensis Hartmann-Schröder, 1982
• Autolytus benazzii Cognetti, 1953
• Autolytus beringianus Annenkova, 1934
• Autolytus bicolor Rullier, 1972
• Autolytus bidens Treadwell, 1941 accepted as Odontosyllis enopla Verrill, 1900
• Autolytus bondei Day, 1934
• Autolytus boreatus Imajima, 1966
• Autolytus brachycephalus (Marenzeller, 1874)
• Autolytus branchiatus Averincev, 1972
• Autolytus brevicirrata Winternitz, 1936
• Autolytus canariensis (Greeff, 1879)
• Autolytus caterinkae Uschakov, 1950
• Autolytus charcoti Gravier, 1906
• Autolytus chathamensis Knox, 1960
• Autolytus cognettii Çinar & Gambi, 2005 accepted as Myrianida cognettii (Çinar & Gambi, 2005)
• Autolytus convolutus Cognetti, 1953
• Autolytus cornutus Agassiz, 1862
• Autolytus dentalius Imajima, 1966
• Autolytus edwardsi Saint Joseph, 1887 accepted as Myrianida edwardsi (Saint Joseph, 1887)
• Autolytus edwardsii Saint Joseph, 1887
• Autolytus edwarsi Saint Joseph, 1887
• Autolytus ehbiensis Saint Joseph, 1887
• Autolytus emertoni Verrill, 1881
• Autolytus fallax Malmgren, 1867
• Autolytus fasciata Langerhans, 1879
• Autolytus fasciatus (Bosc, 1802)
• Autolytus gibber Ehlers, 1897
• Autolytus groenlandicus Wesenberg-Lund, 1947
• Autolytus hesperidium Claparède, 1868 accepted as Myrianida hesperidium (Claparède, 1868)
• Autolytus hesperidum Claparède, 1868 accepted as Myrianida prolifera (O.F. Müller, 1788)
• Autolytus incertus Malmgren, 1867 accepted as Proceraea prismatica (O.F. Müller, 1776)
• Autolytus inermis Saint Joseph, 1887
• Autolytus irregularis Imajima & Hartman, 1964 accepted as Myrianida irregularis (Imajima & Hartman, 1964)
• Autolytus japonensis Imajima & Hartman, 1964