| Parapionosyllis Fauvel, 1923 |
| Parapionosyllis floridana San Martín, 1991 |
| Parapionosyllis longicirrata (Webster & Benedict, 1884) |
| Parapionosyllis uebelackerae San Martín, 1991 |
| Parasphaerosyllis Monro, 1937 |
| Parasphaerosyllis indica Monro, 1937 |
| Parasphaerosyllis malimalii Capa, San Martín & López, 2001 |
| 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 microtentaculata (Westheide, 1974) |
| Parexogone sanmartini Ruíz-Ramírez & Salazar-Vallejo, 2001 |
| Parexogone wolfi San Martín, 1991 |
| Perkinsyllis San Martín, López & Aguado, 2009 |
| Perkinsyllis homocirrata (Hartmann-Schröder, 1958) |
| Perkinsyllis spinisetosa (San Martín, 1990) |
| Petitia Siewing, 1956 |