Polymorphidae

thumb|Red pigment depiction of the Polymorphus

Filicollis is a genus of parasitic worms belonging to the family Polymorphidae.

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 Polymorphinae 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.

species of worm

Andracantha is a genus of parasitic worms belonging to the family Polymorphidae.

species of worm

Bolbosoma is a genus in Acanthocephala (thorny-headed worms, also known as spiny-headed worms).

Arhythmorhynchus is a genus of parasitic worms in Acanthocephala (thorny-headed worms, also known as spiny-headed worms) belonging to the family Polymorphidae. ==Taxonomy== The genus was described by Lühe in 1911. The National Center for Biotechnology Information does not indicate that any phylogenetic analysis has been published on any Arhythmorhynchus species that would confirm its position as a unique genus in the family Polymorphidae.

Southwellina is a genus in Acanthocephala (thorny-headed worms, also known as spiny-headed worms). ==Taxonomy== The genus was described by Witenberg in 1932. Phylogenetic analysis has been published on Southwellina species. The type species is S. hispida. ==Description== Southwellina species consist of a proboscis covered in hooks and a trunk. ==Species== The genus Southwellina contains three species. Southwellina hispida Southwellina macracanthus Southwellina sacra ==Distribution== The distribution of Southwellina is determined by that of its hosts. The species of this genus are found in

Corynosoma is a genus of parasitic worms belonging to the family Polymorphidae.

species of worm

Profilicollis is a genus of acanthocephalan parasites of crustaceans. The status of the genus Profilicollis has been debated, and species placed in this genus were formerly included in the genus Polymorphus. However, research on the morphology of the group and their use of hosts has concluded that Profilicollis and Polymorphus should be regarded as distinct genera, and species previously described as Polymorphus altmani are now referred to as Profilicollis altmani in taxonomic and biological literature. Profilicollis parasites infect decapod crustaceans, usually shore crabs, as intermediate ho

species of worm

Eocollis is a genus in Acanthocephala (thorny-headed worms, also known as spiny-headed worms).