Polymorphida

Polymorphida
Corynosoma wegeneri
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Acanthocephala
Class: Palaeacanthocephala
Order: Polymorphida
Petrochenko, 1956

Polymorphida are an order of thorny-headed worms (phylum Acanthocephala). The adults of these parasitic platyzoans feed mainly on fish and aquatic birds.

This order contains 5 families: