Acanthocephala

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Related to acanthocephalans: phylum Acanthocephala

Acanthocephala

 [ah-kan″tho-sef´ah-lah]
a phylum of elongate, mostly cylindrical organisms (thorny headed worms) parasitic in the intestines of all classes of vertebrates.

A·can·tho·ceph·a·la

(ă-kan'thō-sef'ă-lă),
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 cestodelike 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. kephalē, head]
References in periodicals archive ?
No acanthocephalan and trematode parasites were observed during the study period.
Host manipulation revisited: no evidence for a causal link between altered photophobia and increased trophic transmission of amphipods infected with acanthocephalans. Funct.
3 2.9 (1.5-6.2) ND * Others 5 4.9 (1.5-8.2) ND Helminths Strongyloides stercoralis 45 43.7 (40.4-47) 638 Toxocara cati 24 23.3 (20-26.6) 1027 Hookworms (Ancylostoma spp.) 10 9.7 (6.4-13) 417 Dipylidium caninum 9 8.7 (5.4-12) 389 Acanthocephalan spp.
Nematodes and acanthocephalans were observed only for presence or absence due to their low occurrence.
During May and September 1987, one juvenile and three adult (carapace length = three males, 95-195 mm; one female, 183 mm) red-eared sliders (Trachemys scripta elegans) were collected by hand from a stock pond off 1-3 5N in Denton, Denton County (n = 1; 33.233285[degrees]N, 97.065082[degrees]W), 19 km SE Granbury off county road 325 at Taylor Branch, Hood County (n = 1; 32.326918[degrees]N, 97.624780[degrees]W), and Georges Creek Ranch, 13 km SSW Cleburne off US 67, Johnson County (n = 2; 32.309478[degrees]N, 97.595115[degrees]N) and examined for acanthocephalans. Turtles were overdosed with an intraperitoneal injection of sodium pentobarbital (Nembutal[R]) and a 190 cm stainless steel hand saw was used to remove the plastron.
Acanthocephalans and cestodes of South American monkeys and marmosets.
Additionally, he reported what he believed to be the first record of an acanthocephalan (Leptorhynchoides thecatus) from the three-toed amphiuma.
Insects are the usual intermediate hosts for acanthocephalans (Nickol, 1985); thus, their occurrence in insectivores could be anticipated.
Tufts veterinary students discovered the ducks were infected with intestinal parasites known as acanthocephalans ("spiny-headed worms").