Polymorphidae

Polymorphidae
Corynosoma wegeneri photomicrograph
Scientific classification
Kingdom:	Animalia
Phylum:	Acanthocephala
Class:	Palaeacanthocephala
Order:	Polymorphida
Family:	Polymorphidae Meyer, 1931
Genera
Andracantha Schmidt, 1975 Ardeirhynchus Dimitrova & Georgiev, 1994 - tentatively placed here Arhythmorhynchus Lühe, 1911 Bolbosoma Porta, 1908 Corynosoma Lühe, 1904 Diplospinifer Fukui, 1929 Filicollis Lühe, 1911 Hexaglandula Polymorphus Lühe, 1911 Profilicollis Meyer, 1931--similar morphology to Polymorphus Southwellina Witenberg, 1932 - might belong in Arhythmorhynchus
Synonyms
Filicollidae Petrochenko, 1956

Filicollidae Petrochenko, 1956

The thorny-headed worm family Polymorphidae contains endoparasites which as adults feed mainly in fish and aquatic birds. When this taxon was erected by Meyer in 1931, a subfamily Polymorphidae was established in it. As the Polymorphidae as presently understood would then be monotypic, with no basal genera outside the Polymorphinae, the proposed subfamily is redundant for the time being and therefore most modern treatments simply omit it.

Polymorphus minutus is an economically significant parasite in goose and duck farming.

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Wikipedia