The Phylum Acanthocephela

Thorny-headed worms

1000 species
These are parasitic worms which attach themselves to the host by means of a proboscis with curved spines. Otherwise they are very like nematode worms; they range from less than 2.5cm long to about 50cm. Typical hosts are waterfowl which become infected by eating freshwater shrimps which harbour the larvae.

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