- Syllis aciculigrossa (San Martín, 1990)
- Syllis adamantea (Treadwell, 1914)
- Syllis albae Álvarez-Campos & Verdes, 2017
- Syllis albanyensis (Hartmann-Schröder, 1984)
- Syllis alosae San Martín, 1992
- Syllis alternata Moore, 1908
- Syllis amica Quatrefages, 1866
- Syllis amicarmillaris Simon, San Martín & Robinson, 2014
- Syllis anoculata (Hartmann-Schröder, 1962)
- Syllis antoniae Salcedo Oropeza, San Martín & Solís-Weiss, 2012
- Syllis armillaris (O.F. Müller, 1776)
- Syllis augeneri Haswell, 1920
- Syllis barbata San Martín, 1992
- Syllis bella Chamberlin, 1919
- Syllis beneliahuae (Campoy & Alquézar, 1982)
- Syllis benguellana Day, 1963
- Syllis boggemanni San Martín, Álvarez-Campos & Hutchings, 2017
- Syllis botosaneanui (Hartmann-Schröder, 1973)
- Syllis brasiliensis McIntosh, 1885
- Syllis breviarticulata Grube, 1857
- Syllis brevicirrata McIntosh, 1908
- Syllis brevicirris Hansen, 1882
- Syllis broomensis (Hartmann-Schröder, 1979)
- Syllis caeca Monro, 1933
- Syllis castroviejoi Capa, San Martín & López, 2001
- Syllis cerina Grube, 1878
- Syllis cirrita Lee & Rho, 1994
- Syllis columbretensis (Campoy, 1982)
- Syllis compacta Gravier, 1900
- Syllis corallicola Verrill, 1900
- Syllis cornuta Rathke, 1843
- Syllis crassicirrata (Treadwell, 1925)
- Syllis cruzi Núñez & San Martín, 1991
- Syllis curticirris Monro, 1937
- Syllis danieli San Martín, 1992
- Syllis deleoni Salcedo Oropeza, San Martín & Solís-Weiss, 2012
- Syllis edensis (Hartmann-Schröder, 1989)
- Syllis elongata (Johnson, 1901)
- Syllis ergeni Çinar, 2005
- Syllis erikae (Hartmann-Schröder, 1981)
- Syllis fasciata Malmgren, 1867
- Syllis ferrani Alós & San Martín, 1987
- Syllis filidentata (Hartmann-Schröder, 1962)
- Syllis garciai (Campoy, 1982)
- Syllis gerlachi (Hartmann-Schröder, 1960)
- Syllis gerundensis (Alós & Campoy, 1981)
- Syllis glandulata Nogueira & San Martín, 2002
- Syllis glarearia (Westheide, 1974)
- Syllis golfonovensis (Hartmann-Schröder, 1962)
- Syllis gracilis Grube, 1840
- Syllis guidae Nogueira & Yunda-Guarin, 2008
- Syllis heterochaeta Moore, 1909
- Syllis hyalina Grube, 1863
- Syllis hyllebergi (Licher, 1999)
- Syllis joaoi San Martín, Álvarez-Campos & Hutchings, 2017
- Syllis jorgei San Martín & López, 2000
- Syllis kabilica Ben-Eliahu, 1977
- Syllis karlae San Martín, Álvarez-Campos & Hutchings, 2017
- Syllis kas Lucas, Sikorski & San Martín, 2018
- Syllis komodoensis Aguado, San Martín & ten Hove, 2008
- Syllis krohnii Ehlers, 1864
- Syllis lagunae Tovar-Hernández, Hernández-Alcántara & Solís-Weiss, 2008
- Syllis latifrons Grube, 1857
- Syllis licheri Ravara, San Martín & Moreira, 2004
- Syllis limbata Grube, 1880
- Syllis longesegmentata Grube, 1857
- Syllis lunaris (Imajima, 1966)
- Syllis lutea (Hartmann-Schröder, 1960)
- Syllis luteoides (Hartmann-Schröder, 1962)
- Syllis macroceras Grube, 1857
- Syllis macrodentata (Hartmann-Schröder, 1982)
- Syllis magdalena Wesenberg-Lund, 1962
- Syllis magnapalpa (Hartmann-Schröder, 1965)
- Syllis marceloi San Martín, Álvarez-Campos & Hutchings, 2017
- Syllis marugani Aguado, San Martín & Nishi, 2006
- Syllis maryae San Martín, 1992
- Syllis mauretanica (Licher, 1999)
- Syllis mayeri Musco & Giangrande, 2005
- Syllis mercedesae Lucas, San Martín & Parapar, 2012
- Syllis mexicana (Rioja, 1960)
- Syllis microoculata (Hartmann-Schröder, 1965)
- Syllis monilaris Savigny in Lamarck, 1818
- Syllis mytilorum Studer, 1889
- Syllis nigra Augener, 1925
- Syllis nigrescens Grube, 1878
- Syllis nigricirris Grube, 1863
- Syllis nigriscens Grube, 1878
- Syllis nigropunctata Haswell, 1886
- Syllis notocera Ehlers, 1905
- Syllis nuchalis (Hartmann-Schröder, 1960)
- Syllis obscura Grube, 1857
- Syllis onkylochaeta Hartmann-Schröder, 1991
- Syllis ortizi San Martín, 1992
- Syllis parapari San Martín & López, 2000
- Syllis parturiens Haswell, 1920
- Syllis pectinans Haswell, 1920
- Syllis picta (Kinberg, 1866)
- Syllis pigmentata (Chamberlin, 1919)
- Syllis pilosa Aguado, San Martín & Nishi, 2008
- Syllis pontxioi San Martín & López, 2000
- Syllis profunda Cognetti, 1955
- Syllis prolifera Krohn, 1852
- Syllis prolixa Ehlers, 1901
- Syllis pseudoarmillaris Nogueira & San Martín, 2002
- Syllis pulvinata (Langerhans, 1881)
- Syllis quadrifasciata Fischli, 1900
- Syllis quaternaria Moore, 1906
- Syllis ramosa McIntosh, 1879
- Syllis riojai (San Martín, 1990)
- Syllis robertianae McIntosh, 1885
- Syllis rosea (Langerhans, 1879)
- Syllis rubicunda Aguado, San Martín & Nishi, 2008
- Syllis rudolphi Delle Chiaje, 1841
- Syllis schulzi (Hartmann-Schröder, 1960)
- Syllis sclerolaema Ehlers, 1901
- Syllis setoensis (Imajima, 1966)
- Syllis sol San Martín, 2004
- Syllis stenura Blanchard in Gay, 1849
- Syllis tamarae Álvarez-Campos & Verdes, 2017
- Syllis tiedemanni Delle Chiaje, 1841
- Syllis torquata Marion & Bobretzky, 1875
- Syllis tripantu Álvarez-Campos & Verdes, 2017
- Syllis truncata Haswell, 1920
- Syllis tyrrhena (Licher & Kuper, 1998)
- Syllis umbricolor Grube, 1878
- Syllis unzima Simon, San Martín & Robinson, 2014
- Syllis valida Grube, 1857
- Syllis variegata Grube, 1860
- Syllis villenai Aguado, San Martín & ten Hove, 2008
- Syllis violacea Grube, 1870
- Syllis vittata Grube, 1840
- Syllis vivipara Krohn, 1869
- Syllis warrnamboolensis (Hartmann-Schröder, 1987)
- Syllis westheidei San Martín, 1984
- Syllis yallingupensis (Hartmann-Schröder, 1982)
- Syllis ypsiloides Aguado, San Martín & ten Hove, 2008
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