| Parasphaerosyllis indica Monro, 1937 |
| Parexogone Mesnil & Caullery, 1918 |
| Parexogone atlantica Perkins, 1981 |
| Parexogone caribensis San Martín, 1991 |
| Parexogone exmouthensis Hartmann-Schröder, 1980 |
| Parexogone gemmifera Pagenstecher, 1862 |
| Parexogone glandulosa (Rioja, 1943) |
| Parexogone sanmartini Ruíz-Ramírez & Salazar-Vallejo, 2001 |
| Parexogone wolfi San Martín, 1991 |
| Perkinsyllis San Martín, López & Aguado, 2009 |
| Perkinsyllis spinisetosa (San Martín, 1990) |
| Petitia Siewing, 1956 |
| Pionosyllis Malmgren, 1867 |
| Pionosyllis aciculata San Martín, 1990 |
| Pionosyllis divaricata (Keferstein, 1862) |
| Pionosyllis elongata Johnson, 1901 |
| Pionosyllis luquei San Martín, 1990 |
| Pionosyllis procera Hartman, 1965 |
| Pionosyllis spinisetosa San Martín, 1990 |
| Pionosyllis templadoi San Martín, 1991 |