A genus of nematodes in the filarioid family Filariidae.
- P. antipini — found in deer.
- P. bovicola — causes hemorrhagic nodules in the skin of cattle and buffalo.
- P. multipapillosa (syn. Filaria haemorrhagica) — causes nodules in the subcutaneous and intermuscular tissues of horses. The nodules break open and discharge blood and then heal. They reappear each summer.
