The thorny-headed worms, a phylum (formerly considered a class) of obligatory parasites without an alimentary canal, characterized by an anterior introvertible spiny proboscis. They superficially resemble nematodes but are cestode like in other traits, and hence are grouped as a distinctive phylum of helminths. In the adult stage they are parasites of vertebrate animals, mostly fish and amphibians; the larval stage is passed in invertebrates, chiefly crustaceans and insects. [acantho- + G. kephale, head]

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Acan·tho·ceph·a·la ə-.kan(t)-thə-'sef-ə-lə n pl a group of elongated parasitic intestinal worms with a hooked proboscis that as adults lack a digestive tract and absorb food through the body wall, and that are usu. classified as a separate phylum related to the phylum Platyhelminthes

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Acan·tho·ceph·a·la (ə-kan″tho-sefґə-lə) [acantho- + Gr. kephalē head] the thorny-headed worms, a phylum of parasites often infesting animals, so called because of the proboscis projecting anteriorly that is covered with thornlike spines for attachment to the digestive tract of the host. In some systems of classification, they are considered to be a class of the phylum Nemathelminthes.

Medical dictionary. 2011.

Look at other dictionaries:

  • Acanthocephala — A*can tho*ceph a*la, n. pl. [NL., from Gr. ? a spine, thorn + ? head.] (Zo[ o]l.) A group of intestinal worms, having the proboscis armed with recurved spines. [1913 Webster] …   The Collaborative International Dictionary of English

  • Acanthocephala — Acanthocephala,   Zoologie: die Kratzer …   Universal-Lexikon

  • Acanthocephala — Acanthocephala, Kratzer, ca. 1000 beschriebene Arten umfassende Klasse der ⇒ Nemathelminthes; Darmparasiten der Wirbeltiere. Mit einem Hakenkranz sind die A. in der Darmwand des Wirts verankert; ihr Darm ist rückgebildet. Gonaden und… …   Deutsch wörterbuch der biologie

  • ACANTHOCEPHALA — ACANTHOCEPHALA, паразитические круглые черви (см. Скребни) …   Большая медицинская энциклопедия

  • Acanthocephala — Kratzwürmer Pomphorhynchus im Rektum eines Blaufisches (Pomatomus saltatrix) Systematik …   Deutsch Wikipedia

  • Acanthocephala — Taxobox name = Acanthocephala image width = 240px image caption = Adult Pomphorhynchus in a Bluefish ( Pomatomus saltatrix ) regnum = Animalia subregnum = Eumetazoa unranked phylum = Bilateria superphylum = Platyzoa phylum = Acanthocephala phylum …   Wikipedia

  • Acanthocephala —   Acanthocephala Corynosoma wegeneri …   Wikipedia Español

  • Acanthocephala — Acanthocéphales Photo de Corynosoma …   Wikipédia en Français

  • Acanthocephala — noun phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny headed worms • Syn: ↑phylum Acanthocephala • Hypernyms: ↑phylum • Member Holonyms: ↑Animalia, ↑kingdom Animalia, ↑animal kingdom …   Useful english dictionary

  • Acanthocephala — …   Википедия

  • Acanthocephala — См. acanthocephalans …   Dictionary of invertebrate zoology

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