1. Subgenus Eusyllis (Synsyllis) Verrill, 1900
   1. Species Eusyllis (Synsyllis) longigularis Verrill, 1900 accepted as Synsyllis longigularis (Verrill, 1900) (superseded original combination)
   2. Species Eusyllis (Synsyllis) viridula Verrill, 1900 accepted as Synsyllis longigularis (Verrill, 1900) (subjective synonym)
2. Species Eusyllis aciculata (Knox, 1960)
3. Species Eusyllis assimilis Marenzeller, 1875
4. Species Eusyllis blomstrandi Malmgren, 1867
5. Species Eusyllis ceylonica Augener, 1926
6. Species Eusyllis collaris (Hartman, 1948)
7. Species Eusyllis edenticulata Pillai, 1965
8. Species Eusyllis fragilis (Webster, 1879)
9. Species Eusyllis grandmariae Brusa, Aguado, San Martín & Rouse, 2013
10. Species Eusyllis habei Imajima, 1966
11. Species Eusyllis intermedia Saint-Joseph, 1887
12. Species Eusyllis irregulata Imajima, 1966
13. Species Eusyllis japonica Imajima & Hartman, 1964
14. Species Eusyllis kupfferi Langerhans, 1879
15. Species Eusyllis lamelligera Marion & Bobretzky, 1875
16. Species Eusyllis liniata (Hartmann-Schröder, 1962)
17. Species Eusyllis longicirrata Imajima, 1966
18. Species Eusyllis longisetosa (Verrill, 1900)
19. Species Eusyllis maxima (Monro, 1930)
20. Species Eusyllis nonatoi Fukuda, Nogueira & San Martín, 2015
21. Species Eusyllis nuchalata Hartmann-Schröder, 1965
22. Species Eusyllis phosphorea Verrill in Smith & Harger, 1874
23. Species Eusyllis spirocirrata Hartmann-Schröder, 1959
24. Species Eusyllis transecta Hartman, 1966
25. Species Eusyllis tubicola (Uschakov, 1950)
26. Species Eusyllis tubifex (Gosse, 1855)
27. Species Eusyllis antillensis Augener, 1922 accepted as Syllis corallicola Verrill, 1900 (subjective synonym)
28. Species Eusyllis autolytoides Hartmann-Schröder, 1991 accepted as Eusyllis kupfferi Langerhans, 1879 (subjective synonym)
29. Species Eusyllis bloomstrandi accepted as Eusyllis blomstrandi Malmgren, 1867 (lapsus calami)
30. Species Eusyllis brevicirrata Knox & Cameron, 1971 accepted as Megasyllis corruscans (Haswell, 1886) (subjective synonym)
31. Species Eusyllis dentata Hartmann-Schröder, 1990 accepted as Eusyllis lamelligera Marion & Bobretzky, 1875 (subjective synonym)
32. Species Eusyllis heterocirrata Hartmann-Schröder, 1959 accepted as Westheidesyllis heterocirrata (Hartmann-Schröder, 1959) (superseded original combination)
33. Species Eusyllis homocirrata Hartmann-Schröder, 1958 accepted as Perkinsyllis homocirrata (Hartmann-Schröder, 1958) (superseded original combination)
34. Species Eusyllis inflata (Marenzeller, 1879) accepted as Megasyllis inflata (Marenzeller, 1879) (superseded recombination)
35. Species Eusyllis kerguelensis McIntosh, 1885 accepted as Pionosyllis kerguelensis (McIntosh, 1885) (superseded original combination)
36. Species Eusyllis lucifer Verrill, 1875 accepted as Odontosyllis lucifera (Verrill, 1875) (superseded original combination)
37. Species Eusyllis magnifica (Moore, 1906) accepted as Pionosyllis magnifica Moore, 1906 (superseded recombination)
38. Species Eusyllis monilicornis Malmgren, 1867 accepted as Eusyllis blomstrandi Malmgren, 1867 (subjective synonym)
39. Species Eusyllis serrata Hartmann-Schröder, 1984 accepted as Perkinsyllis serrata (Hartmann-Schröder, 1984) (superseded original combination)
40. Species Eusyllis setubalensis (McIntosh, 1885) accepted as Haplosyllis spongicola (Grube, 1855) (recombination of subjective synonym)
41. Species Eusyllis tenera Verrill, 1882 accepted as Eusyllis fragilis (Webster, 1879) (subjective synonym)

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