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The acanthocephalans include about 1150 species, all of them parasitic. They have elongate, dorso-ventrally flattened forms, ranging from 2mm to approximately 1 metre in length. The most characteristic feature of this phylum is a spiny proboscis which can be everted to act as an attachment organ.

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Science » Biology » Flora and Fauna » Animalia » Pseudocoelomates (7) Science » Biology » Microbiology » Parasites (30)

Links:

Acanthocephala (Thorny-headed Worms) Images and brief description. www.biosci.ohio-state.edu/~parasite/acanthocephala.html

Phylum Acanthocephala Outline of the biology of Acanthocephala, including their features, reproduction and life cycle, ecology, and classification. www.rtis.com/nat/user/elsberry/taxa/acanth.htm

Phylum Acanthocephala Brief description and images of this phylum of parasitic invertebrate animals. www.biology.missouri.edu/courses/Bio10/Acanthocephala.html