Polymorphus

Polymorphus

a genus of thorny-headed worms in the phylum Acanthocephala.

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Polymorphus boschadis

found in the posterior part of the small intestine of many domesticated and wild birds including ducks and fowls. Causes anemia, wasting and enteritis, and heavy infestations cause death losses in colonies of aquatic birds.

Polymorphus botulus

causes death losses in eider duck colonies.

Polymorphus magnus

found in the intestines of wild anseriform birds.