• Branchiosyllis cirropunctata (Michel, 1909)
• Branchiosyllis exilis (Gravier, 1900)
• Branchiosyllis uncinigera (Hartmann-Schröder, 1960) accepted as Branchiosyllis exilis (Gravier, 1900)
• Chaetosyllis oerstedi Malmgren, 1867 (uncertain > nomen dubium)
• Ehlersia (Syllis) cornuta (Rathke, 1843) accepted as Syllis cornuta Rathke, 1843
• Ehlersia (Syllis) rosea Langerhans, 1879 accepted as Syllis rosea (Langerhans, 1879)
• Ehlersia (Syllis) simplex Langerhans, 1879 accepted as Syllis amica Quatrefages, 1866
• Ehlersia beneliahui (Campoy, 1982) accepted as Syllis beneliahuae (Campoy, 1982)
• Ehlersia cornuta (Rathke, 1843) accepted as Syllis cornuta Rathke, 1843
• Ehlersia ferrugina Langerhans, 1881 accepted as Paraehlersia ferrugina (Langerhans, 1881)
• Ehlersia ferruginea Langerhans, 1881 accepted as Paraehlersia ferrugina (Langerhans, 1881)
• Ehlersia garciai (Campoy, 1982) accepted as Syllis garciai (Campoy, 1982)
• Ehlersia nepiotoca Caullery & Mesnil, 1916 (uncertain > nomen dubium)
• Ehlersia rosea Langerhans, 1879 accepted as Syllis rosea (Langerhans, 1879)
• Ehlersia simplex Langerhans, 1879 accepted as Syllis amica Quatrefages, 1866
• Eurysyllis brevipes (Hartmann-Schröder, 1956) accepted as Plakosyllis brevipes Hartmann-Schröder, 1956
• Eurysyllis lenta Quatrefages, 1866 accepted as Eurysyllis tuberculata Ehlers, 1864
• Eurysyllis paradoxa (Claparède, 1864) accepted as Eurysyllis tuberculata Ehlers, 1864
• Eurysyllis tuberculata Ehlers, 1864
• Geminosyllis granulosa Lattig, San Martín & Martin, 2007 accepted as Haplosyllis granulosa (Lattig, San Martín & Martin, 2007)
• Haplosyllis (Syllis) hamata (Claparède, 1868) accepted as Haplosyllis spongicola (Grube, 1855)
• Haplosyllis carmenbritoae Lattig, San Martín & Martin, 2007
• Haplosyllis chamaeleon Laubier, 1960
• Haplosyllis depressa Augener, 1913 accepted as Trypanobia depressa (Augener, 1913)
• Haplosyllis depressa chamaeleon Laubier, 1960 accepted as Haplosyllis chamaeleon Laubier, 1960
• Haplosyllis granulosa (Lattig, San Martín & Martin, 2007)
• Haplosyllis hamata (Claparède, 1868) accepted as Haplosyllis spongicola (Grube, 1855)
• Haplosyllis oligochaeta (Bobretzky, 1870) accepted as Haplosyllis spongicola (Grube, 1855)
• Haplosyllis oligochaeta pontica Czerniavsky, 1881 (uncertain > nomen dubium)
• Haplosyllis spongicola (Grube, 1855)
• Haplosyllis spongicola tentaculata Marion, 1877 accepted as Haplosyllis spongicola (Grube, 1855)
• Haplosyllis spongiphila (Verrill, 1885)
• Haplosyllis villogorgicola Martin, Núñez, Riera & Gil, 2000
• Inermosyllis balearica (San Martín, 1982)
• Ioda macrophthalma [auctt.] accepted as Ioida macrophthalma Johnston, 1839 accepted as Syllis armillaris (O.F. Müller, 1776)
• Ioida macrophthalma Johnston, 1839 accepted as Syllis armillaris (O.F. Müller, 1776)
• Ioida macrophthalmus [auct. misspelling] accepted as Syllis armillaris (O.F. Müller, 1776)
• Ioida pontica Czerniavsky, 1881 accepted as Syllis pontica (Czerniavsky, 1881)
• Isosyllis armoricana (Claparède, 1863) accepted as Syllis variegata Grube, 1860
• Langerhansia beneliahui Campoy, 1982 accepted as Syllis beneliahuae (Campoy, 1982)
• Langerhansia binocula Czerniavsky, 1881 accepted as Syllis biocula (Czerniavsky, 1881)
• Langerhansia caeca Katzmann, 1973 accepted as Syllis caeca (Katzmann, 1973)
• Langerhansia cornuta (Rathke, 1843) accepted as Syllis cornuta Rathke, 1843
• Langerhansia ferrugina (Langerhans, 1881) accepted as Paraehlersia ferrugina (Langerhans, 1881)
• Langerhansia garciai Campoy, 1982 accepted as Syllis garciai (Campoy, 1982)
• Langerhansia heterochaeta (Moore, 1909) accepted as Syllis heterochaeta Moore, 1909
• Langerhansia rosea (Langerhans, 1879) accepted as Syllis rosea (Langerhans, 1879)
• Opisthosyllis brunnea Langerhans, 1879
• Opisthosyllis viridis Langerhans, 1879
• Parasphaerosyllis indica Monro, 1937
• Paratyposyllis peresi Laubier, 1968
• Plakosyllis brevipes Hartmann-Schröder, 1956
• Plakosyllis quadrioculata Perkins, 1981 accepted as Plakosyllis brevipes Hartmann-Schröder, 1956
• Polymastus paradoxus Claparède, 1864 accepted as Eurysyllis tuberculata Ehlers, 1864
• Syllis (Ehlersia) cornuta Rathke, 1843 accepted as Syllis cornuta Rathke, 1843
• Syllis (Ehlersia) ferrugina (Langerhans, 1881) accepted as Paraehlersia ferrugina (Langerhans, 1881)
• Syllis (Ehlersia) ferruginea (Langerhans, 1881) accepted as Paraehlersia ferrugina (Langerhans, 1881)
• Syllis (Ehlersia) simplex (Langerhans, 1879) accepted as Syllis amica Quatrefages, 1866
• Syllis (Haplosyllis) hamata Claparède, 1868 accepted as Haplosyllis spongicola (Grube, 1855)
• Syllis (Haplosyllis) spongicola Grube, 1855 accepted as Haplosyllis spongicola (Grube, 1855)
• Syllis (Langerhansia) biocula Czerniavsky, 1881 accepted as Syllis biocula (Czerniavsky, 1881)
• Syllis (Langerhansia) cornuta Rathke, 1843 accepted as Syllis cornuta Rathke, 1843
• Syllis (Langerhansia) ferrugina (Langerhans, 1881) accepted as Paraehlersia ferrugina (Langerhans, 1881)
• Syllis (Syllides) longocirrata Örsted, 1845 accepted as Syllides longocirratus (Örsted, 1845)
• Syllis (Syllis) gracilis Grube, 1840 accepted as Syllis gracilis Grube, 1840
• Syllis (Typosyllis) alternata (Moore, 1908) accepted as Syllis alternata Moore, 1908
• Syllis (Typosyllis) alternata kabilica Ben-Eliahu, 1977 accepted as Syllis kabilica Ben-Eliahu, 1977
• Syllis (Typosyllis) alternosetosa Saint Joseph, 1887 accepted as Syllis armillaris (O.F. Müller, 1776)
• Syllis (Typosyllis) amica Quatrefages, 1866 accepted as Syllis amica Quatrefages, 1866
• Syllis (Typosyllis) armillaris (O.F. Müller, 1776) accepted as Syllis armillaris (O.F. Müller, 1776)
• Syllis (Typosyllis) bouvieri Gravier, 1900 accepted as Syllis bouvieri Gravier, 1900
• Syllis (Typosyllis) capensis McIntosh, 1885 accepted as Syllis armillaris (O.F. Müller, 1776)
• Syllis (Typosyllis) cincinnata Verrill, 1900 accepted as Syllis corallicola Verrill, 1900
• Syllis (Typosyllis) cirropunctata Michel, 1909 accepted as Branchiosyllis cirropunctata (Michel, 1909)
• Syllis (Typosyllis) compacta Gravier, 1900 accepted as Syllis compacta Gravier, 1900
• Syllis (Typosyllis) corallicoides Augener, 1922 accepted as Syllis corallicola Verrill, 1900
• Syllis (Typosyllis) corallicola Verrill, 1900 accepted as Syllis corallicola Verrill, 1900
• Syllis (Typosyllis) cornuta Rathke, 1843 accepted as Syllis cornuta Rathke, 1843
• Syllis (Typosyllis) exilis Gravier, 1900 accepted as Branchiosyllis exilis (Gravier, 1900)
• Syllis (Typosyllis) fasciata Malmgren, 1867 accepted as Syllis fasciata Malmgren, 1867
• Syllis (Typosyllis) gerlachi (Hartmann-Schröder, 1960) accepted as Syllis gerlachi (Hartmann-Schröder, 1960)
• Syllis (Typosyllis) gerundensis (Alós & Campoy, 1981) accepted as Syllis gerundensis (Alós & Campoy, 1981)
• Syllis (Typosyllis) golfonovensis (Hartmann-Schröder, 1962) accepted as Syllis golfonovensis (Hartmann-Schröder, 1962)
• Syllis (Typosyllis) hyalina Grube, 1863 accepted as Syllis hyalina Grube, 1863
• Syllis (Typosyllis) krohni Ehlers, 1864 accepted as Syllis krohnii Ehlers, 1864
• Syllis (Typosyllis) krohnii Ehlers, 1864 accepted as Syllis krohnii Ehlers, 1864
• Syllis (Typosyllis) prolifera Krohn, 1852 accepted as Syllis prolifera Krohn, 1852
• Syllis (Typosyllis) pulvinata (Langerhans, 1881) accepted as Syllis pulvinata (Langerhans, 1881)
• Syllis (Typosyllis) schulzi (Hartmann-Schröder, 1960) accepted as Syllis schulzi (Hartmann-Schröder, 1960)
• Syllis (Typosyllis) torquata Marion & Bobretzky, 1875 accepted as Syllis torquata Marion & Bobretzky, 1875
• Syllis (Typosyllis) truncata Haswell, 1920 accepted as Syllis truncata Haswell, 1920
• Syllis (Typosyllis) truncata cryptica Ben-Eliahu, 1977 accepted as Syllis gerlachi (Hartmann-Schröder, 1960)
• Syllis (Typosyllis) truncata mediterranea Ben-Eliahu, 1977 accepted as Syllis pulvinata (Langerhans, 1881)
• Syllis (Typosyllis) variegata Grube, 1860 accepted as Syllis variegata Grube, 1860
• Syllis (Typosyllis) variegata variegata Cognetti, 1954 accepted as Syllis variegata Grube, 1860
• Syllis (Typosyllis) vittata Grube, 1840 accepted as Syllis vittata Grube, 1840
• Syllis (Typosyllis) vivipara Krohn, 1869 accepted as Syllis vivipara Krohn, 1869
• Syllis (Typosyllis) zonata (Haswell, 1886) accepted as Syllis prolifera Krohn, 1852
• Syllis abyssicola Ehlers, 1874 (uncertain > nomen dubium)
• Syllis aesthetica Saint Joseph, 1887 accepted as Syllis amica Quatrefages, 1866