| Syllis limbata (Claparède, 1868) |
| Syllis longigularis Verrill, 1900 |
| Syllis longosegmentata Grube, 1857 |
| Syllis lutea (Hartmann-Schröder, 1960) |
| Syllis magna (Westheide, 1974) |
| Syllis maryae San Martín, 1992 |
| Syllis mayeri Musco & Giangrande, 2005 |
| Syllis mexicana (Rioja, 1960) |
| Syllis okadai Fauvel, 1934 |
| Syllis ortizi San Martín, 1992 |
| Syllis papillosus (Tovar-Hernández, Granados-Barba & Solís-Weiss, 2002) |
| Syllis prolifera Krohn, 1852 |
| Syllis regulata Imajima, 1966 |
| Syllis riojai (San Martín, 1990) |
| Syllis rosea (Langerhans, 1879) |
| Syllis sardai San Martín, 1992 |
| Syllis scabra Ehlers, 1864 |
| Syllis setoensis (Imajima, 1966) |
| Syllis spongicola Grube, 1855 |
| Syllis tigrinoides Uebelacker, 1982 |