1. Genus Acritagasyllis Lucas, San Martín & Sikorski, 2010
2. Genus Anguillosyllis Day, 1963
3. Subfamily Anoplosyllinae Aguado & San Martín, 2009
   1. Genus Anoplosyllis Claparède, 1868
   2. Genus Astreptosyllis Kudenov & Dorsey, 1982
   3. Genus Streptospinigera Kudenov, 1983
   4. Genus Streptosyllis Webster & Benedict, 1884
   5. Genus Syllides Örsted, 1845
4. Subfamily Autolytinae Langerhans, 1879
   1. Tribe Autolytini Langerhans, 1879
      1. Genus Cryptochaetosyllis Jimi, Britayev & Martin in Jimi et al., 2024
      2. Genus Epigamia Nygren, 2004
      3. Genus Myrianida Milne Edwards, 1845
      4. Genus Autolytides Malaquin, 1893 accepted as Myrianida Milne Edwards, 1845 (subjective synonym)
      5. Genus Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845 (subjective synonym)
      6. Genus Crithida Gosse, 1855 accepted as Myrianida Milne Edwards, 1845 (subjective synonym)
      7. Genus Diploceraea Grube, 1850 accepted as Myrianida Milne Edwards, 1845 (subjective synonym)
      8. Genus Podenereis Blainville, 1818 accepted as Myrianida Milne Edwards, 1845 (nomen oblitum)
      9. Genus Podonereis [auct. misspelling] accepted as Myrianida Milne Edwards, 1845 (misspelling of Podenereis)
      10. Genus Sacconereis J. Müller, 1853 accepted as Myrianida Milne Edwards, 1845 (subjective synonym)
      11. Genus Sylline Grube, 1860 accepted as Myrianida Milne Edwards, 1845 (subjective synonym)
   2. Tribe Procerini Nygren, 2004
      1. Genus Erseia Nygren, Sundkvist, Mikac & Pleijel, 2010
      2. Genus Imajimaea Nygren, 2004
      3. Genus Levidorum Hartman, 1967
      4. Genus Pachyprocerastea Nygren, 2004
      5. Genus Paraproceraea Nygren, 2004
      6. Genus Paraprocerastea San Martín & Alós, 1989
      7. Genus Planicirrata Nygren, 2004
      8. Genus Proceraea Ehlers, 1864
      9. Genus Procerastea Langerhans, 1884
      10. Genus Virchowia Langerhans, 1879
      11. Genus Amytis Savigny, 1822 accepted as Proceraea Ehlers, 1864 (nomen oblitum according to Article 23.9.1 (ICZN, 1999))
      12. Genus Autosyllis Imajima & Hartman, 1964 accepted as Virchowia Langerhans, 1879 (subjective synonym)
      13. Genus Nereisyllis Blainville, 1828 accepted as Proceraea Ehlers, 1864 (nomen oblitum according to Article 23.9.1 (ICZN, 1999))
      14. Genus Polybostrichus Örsted, 1842 accepted as Proceraea Ehlers, 1864 (subjective synonym, male reproductive stolon morphs)
      15. Genus Polynice Savigny, 1822 accepted as Proceraea Ehlers, 1864 (nomen oblitum according to Article 23.9.1 (ICZN, 1999))
      16. Genus Procera [auct. misspelling] accepted as Proceraea Ehlers, 1864 (lapsus calami; misspelling of Proceraea)
      17. Genus Procerea [auct. misspelling] accepted as Proceraea Ehlers, 1864 (lapsus calami; misspelling of Proceraea)
      18. Genus Pterautolytus Ehlers, 1907 accepted as Proceraea Ehlers, 1864 (subjective synonym)
      19. Genus Regulatus Imajima, 1966 accepted as Proceraea Ehlers, 1864
5. Genus Brachysyllis Imajima & Hartman, 1964
6. Genus Campesyllis Chamberlin, 1919
7. Genus Cicese Díaz-Castañeda & San Martín, 2001
8. Subfamily Eusyllinae Malaquin, 1893
   1. Genus Amblyosyllis Grube, 1857
   2. Genus Brevicirrosyllis San Martín, López & Aguado, 2009
   3. Genus Clavisyllis Knox, 1957
   4. Genus Dioplosyllis Gidholm, 1962
   5. Genus Eusyllis Malmgren, 1867
   6. Genus Miscellania Martin, Alós & Sardá, 1990
   7. Genus Neopetitia San Martín, 2003
   8. Genus Nudisyllis Knox & Cameron, 1970
   9. Genus Odontosyllis Claparède, 1863
   10. Genus Opisthodonta Langerhans, 1879
   11. Genus Paraehlersia San Martín, 2003
   12. Genus Perkinsyllis San Martín, López & Aguado, 2009
   13. Genus Pionosyllis Malmgren, 1867
   14. Genus Psammosyllis Westheide, 1990
   15. Genus Streptodonta San Martín & Hutchings, 2006
   16. Genus Synmerosyllis San Martín, López & Aguado, 2009
   17. Genus Westheidesyllis San Martín, López & Aguado, 2009
   18. Genus Amblyosillis [misspelling of Amblyosyllis] accepted as Amblyosyllis Grube, 1857 (misspelling of Amblyosyllis)
   19. Genus Basidiosyllis San Martín, López & Aguado, 2009 accepted as Paraopisthosyllis Hartmann-Schröder, 1991 (subjective synonym)
   20. Genus Desmosyllis Verrill, 1900 accepted as Eusyllis Malmgren, 1867 (subjective synonym)
   21. Genus Gattiola Johnston in Baird, 1861 accepted as Amblyosyllis Grube, 1857
   22. Genus Hesiosyllis Wesenberg Lund, 1950 accepted as Pionosyllis Malmgren, 1867 (subjective synonym)
   23. Genus Nicotia Costa, 1864 accepted as Amblyosyllis Grube, 1857 (subjective synonym)
   24. Genus Odontoautolytus Hartmann-Schröder, 1979 accepted as Odontosyllis Claparède, 1863 (subjective synonym)
   25. Genus Procome Ehlers, 1864 accepted as Odontosyllis Claparède, 1863 (subjective synonym)
   26. Genus Pseudosyllides Czerniavsky, 1882 accepted as Amblyosyllis Grube, 1857 (subjective synonym)
   27. Genus Thylaciphorus Quatrefages, 1866 accepted as Amblyosyllis Grube, 1857 (subjective synonym)
   28. Genus Umbellisyllis M Sars, 1869 accepted as Odontosyllis Claparède, 1863 (subjective synonym)
9. Subfamily Exogoninae Langerhans, 1879
   1. Genus Brania Quatrefages, 1866
   2. Genus Erinaceusyllis San Martín, 2003
   3. Genus Exogone Örsted, 1845
   4. Genus Exogonita Hartman & Fauchald, 1971
   5. Genus Parapionosyllis Fauvel, 1923
   6. Genus Parexogone Mesnil & Caullery, 1918
   7. Genus Prosphaerosyllis San Martín, 1984
   8. Genus Salvatoria McIntosh, 1885
   9. Genus Sphaerosyllis Claparède, 1863
   10. Genus Cystonereis Kölliker, 1846 accepted as Exogone Örsted, 1845
   11. Genus Exagone Örsted, 1845 accepted as Exogone Örsted, 1845 (lapsus calami)
   12. Genus Exogene [auct. misspelling for 'Exogone'] accepted as Exogone Örsted, 1845 (lapsus calami)
   13. Genus Exogona Örsted, 1845 accepted as Exogone Örsted, 1845 (lapsus calami)
   14. Genus Exogonella Hartman, 1961 accepted as Parexogone Mesnil & Caullery, 1918 (subjective synonym)
   15. Genus Exotokas Ehlers, 1864 accepted as Exogone Örsted, 1845
   16. Genus Gossia Quatrefages, 1866 accepted as Exogone Örsted, 1845 (subjective synonym)
   17. Genus Grubea Quatrefages, 1866 accepted as Salvatoria McIntosh, 1885 (subjective synonym)
   18. Genus Grubeosyllis Verrill, 1900 accepted as Salvatoria McIntosh, 1885 (subjective synonym)
   19. Genus Microsyllis Claparède, 1863 accepted as Exogone Örsted, 1845 (subjective synonym)
   20. Genus Oophylax Ehlers, 1864 accepted as Exogone Örsted, 1845
   21. Genus Paedophylax Claparède, 1868 accepted as Exogone Örsted, 1845 (subjective synonym)
   22. Genus Paedophyllax [auct. misspelling for 'Paedophylax'] accepted as Exogone Örsted, 1845 (unaccepted > misspelling - incorrect subsequent spelling, lapsus calami)
   23. Genus Pedophylax [auct. misspelling for 'Paedophylax'] accepted as Exogone Örsted, 1845 (unaccepted > misspelling - incorrect subsequent spelling, lapsus calami)
   24. Genus Schmardia Quatrefages, 1866 accepted as Exogone Örsted, 1845
   25. Genus Spermosyllis Claparède, 1864 accepted as Exogone Örsted, 1845
   26. Genus Syllia Quatrefages, 1866 accepted as Exogone Örsted, 1845 (subjective synonym)
   27. Genus Sylline [ sensu Claparède, 1864, non Grube, 1860 ] accepted as Exogone (Sylline) [ sensu Claparède, 1864, non Grube, 1860 ] accepted as Exogone Örsted, 1845 (unaccepted > misapplication, misapplication of an Autolytinae name to an Exogoninae)
10. Genus Exogonoides Day, 1963
11. Genus Fauvelia Gravier, 1900
12. Genus Haplosyllides Augener, 1922
13. Genus Irmula Ehlers, 1913
14. Genus Lamellisyllis Day, 1960
15. Genus Monocerina Costa, 1861
16. Genus Murrindisyllis San Martín, Aguado & Murray, 2007
17. Genus Nooralia San Martín, 2002
18. Genus Nuchalosyllis Rullier & Amoureux, 1979
19. Genus Palposyllis Hartmann-Schröder, 1977
20. Genus Parahaplosyllis Hartmann-Schröder, 1990
21. Genus Paraopisthosyllis Hartmann-Schröder, 1991
22. Genus Parasitosyllis Potts, 1912
23. Genus Parautolytus Ehlers, 1900
24. Genus Photocharis Ehrenberg, 1835
25. Genus Phyllosyllis Ehlers, 1897
26. Genus Pseudosyllis Grube, 1863
27. Subfamily Syllinae Grube, 1850
    1. Genus Alcyonosyllis Glasby & Watson, 2001
    2. Genus Branchiosyllis Ehlers, 1887
    3. Genus Dentatisyllis Perkins, 1981
    4. Genus Eurysyllis Ehlers, 1864
    5. Genus Haplosyllis Langerhans, 1879
    6. Genus Inermosyllis San Martín, 2003
    7. Genus Karroonsyllis San Martín & López, 2003
    8. Genus Megasyllis San Martín, Hutchings & Aguado, 2008
    9. Genus Opisthosyllis Langerhans, 1879
    10. Genus Paralcyonosyllis Lattig, Martin, Álvarez-Campos & San Martín in Álvarez-Campos et al., 2025
    11. Genus Parapterosyllis Hartmann-Schröder, 1960
    12. Genus Parasphaerosyllis Monro, 1937
    13. Genus Paratyposyllis Hartmann-Schröder, 1962
    14. Genus Plakosyllis Hartmann-Schröder, 1956
    15. Genus Ramisyllis Glasby, Schroeder & Aguado, 2012
    16. Genus Rhopalosyllis Augener, 1913
    17. Genus Syllis Lamarck, 1818
    18. Genus Tetrapalpia San Martín, Hutchings & Aguado, 2008
    19. Genus Trypanedenta Imajima & Hartman, 1964
    20. Genus Trypanobia Imajima & Hartman, 1964
    21. Genus Trypanospina Álvarez-Campos, Taboada, San Martín, Leiva & Riesgo, 2018
    22. Genus Trypanosyllis Claparède, 1864
    23. Genus Xenosyllis Marion & Bobretzky, 1875
    24. Genus Aporosyllis Quatrefages, 1866 accepted as Syllis Lamarck, 1818 (subjective synonym)
    25. Genus Branquiosyllis [auctt. misspelling for Branchiosyllis] accepted as Branchiosyllis Ehlers, 1887 (unaccepted > misspelling - incorrect subsequent spelling)
    26. Genus Chaetosyllis Malmgren, 1867 accepted as Syllis Lamarck, 1818 (subjective synonym)
    27. Genus Ehlersia Quatrefages, 1866 accepted as Syllis Lamarck, 1818 (subjective synonym)
    28. Genus Eurysillis Ehlers, 1864 accepted as Eurysyllis Ehlers, 1864 (lapsus calami)
    29. Genus Geminosyllis Imajima, 1966 accepted as Haplosyllis Langerhans, 1879 (superfluous replacement name, subjective synonym)
    30. Genus Gnathosyllis Schmarda, 1861 accepted as Syllis Lamarck, 1818 (subjective synonym)
    31. Genus Hemisyllis Verrill, 1900 accepted as Haplosyllis Langerhans, 1879 (subjective synonym)
    32. Genus Ioda [auctt.] accepted as Ioida Johnston, 1839 accepted as Syllis Lamarck, 1818 (lapsus calami)
    33. Genus Ioida Johnston, 1839 accepted as Syllis Lamarck, 1818 (subjective synonym)
    34. Genus Langerhansia Czerniavsky, 1881 accepted as Syllis Lamarck, 1818 (subjective synonym)
    35. Genus Polymastus Claparède, 1864 accepted as Eurysyllis Ehlers, 1864
    36. Genus Tetraglena Quatrefages, 1866 accepted as Trypanosyllis Claparède, 1864
    37. Genus Tetraglene Grube, 1863 accepted as Pseudosyllis Grube, 1863 (unaccepted > junior subjective synonym, simultaneous publication but Pseudosyllis has been preferred subsequently)
    38. Genus Thoe Kinberg, 1866 accepted as Syllis Lamarck, 1818 (subjective synonym)
    39. Genus Trichosyllis Schmarda, 1861 accepted as Syllis Lamarck, 1818 (subjective synonym)
    40. Genus Trypanoseta Imajima & Hartman, 1964 accepted as Haplosyllis Langerhans, 1879 (subjective synonym)
    41. Genus Typosyllis Langerhans, 1879 accepted as Syllis Lamarck, 1818 (subjective synonym)
28. Genus Synsyllis Verrill, 1900
29. Genus Xenosyllides Perejaslavtseva, 1891
30. Genus Alluaudella Gravier, 1905 accepted as Odontosyllis Claparède, 1863 (subjective synonym)
31. Genus Atelesyllis Pruvot, 1930 accepted as Odontosyllis Claparède, 1863 (subjective synonym)
32. Genus Braniella Hartman, 1965 accepted as Anguillosyllis Day, 1963 (subjective synonym)
33. Genus Claparedia Quatrefages, 1866 accepted as Eusyllis Malmgren, 1867 (uncertain synonym)
34. Genus Eudontosyllis Knox, 1960 accepted as Eusyllis Malmgren, 1867 (subjective synonym)
35. Genus Eurymedusa Kinberg, 1866 accepted as Syllis Lamarck, 1818 (subjective synonym)
36. Subfamily Eurysyllinae Hartman, 1965 accepted as Syllinae Grube, 1850
37. Genus Hesperalia Chamberlin, 1919 accepted as Odontosyllis Claparède, 1863 (subjective synonym)
38. Genus Laomedora Kinberg, 1866 accepted as Syllis Lamarck, 1818 (subjective synonym)
39. Genus Lophosyllis Sars, 1867 (unaccepted > nomen nudum)
40. Genus Petitia Siewing, 1956 accepted as Neopetitia San Martín, 2003
41. Genus Pharyngeovalvata Day, 1951 accepted as Odontosyllis Claparède, 1863 (subjective synonym)
42. Genus Pseudobrania San Martín, 1984 accepted as Salvatoria McIntosh, 1885
43. Genus Pseudosyllides Augener, 1927 accepted as Inermosyllis San Martín, 2003 (junior homonym)
44. Genus Pteroautolytus [auctt. misspelling] accepted as Pterautolytus Ehlers, 1907 accepted as Proceraea Ehlers, 1864 (lapsus calami; misspelling)
45. Genus Pterosyllis Claparède, 1863 accepted as Amblyosyllis Grube, 1857 (subjective synonym)
46. Genus Reductotyposyllis Hartmann-Schröder, 1974 accepted as Syllis Lamarck, 1818 (subjective synonym)
47. Genus Sinpalposyllis Hartmann-Schröder, 1983 accepted as Odontosyllis Claparède, 1863 (subjective synonym)
48. Genus Stephanosyllis Claparède, 1864 accepted as Proceraea Ehlers, 1864
49. Subfamily Syllidae incertae sedis (temporary name)
    1. Genus Bollandiella Glasby & Krell, 2009
    2. Genus Guillermogonita Böggemann, 2009
    3. Genus Bollandia Glasby, 1994 accepted as Bollandiella Glasby & Krell, 2009 (junior homonym)
    4. Genus Umbellisyllys M. Sars, 1869 accepted as Umbellisyllis M Sars, 1869 accepted as Odontosyllis Claparède, 1863 (Lapsus calami)
50. Genus Heterosyllis Claparède, 1863 (uncertain > nomen dubium)
51. Genus Lapithas Kinberg, 1866 (uncertain > taxon inquirendum, indeterminable)
52. Genus Periboea Kinberg, 1866 (uncertain > nomen dubium, junior homonym)
53. Genus Platysyllis Grube, 1878 (uncertain > nomen dubium, indeterminable)

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