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Polymorphida

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Polymorphida
Corynosoma wegeneri
Scientific classification
Kingdom:
Subkingdom:
(unranked):
Superphylum:
Phylum:
Class:
Order:
Polymorphida

Petrochenko, 1956
Families

Centrorhynchidae
Plagiorhynchidae
Polymorphidae

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