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A parasite that lives on the exterior of its host.



a parasitic organism that lives on the surface of the body of the host. Ectoparasites make up the largest group of organisms that live on the surface of other organisms. Some ectoparasites are permanently attached to the host, such as copepods living on the skin and gills of fish. However, most move along the host’s body, for example, Urcelariidae and monogenetic flatworms, which parasitize fish, and lice and bird lice, which parasitize birds and occasionally mammals. Various and frequently complex organs of attachment, such as suckers, suction disks, and hooks, are the principal means by which they adapt to existence on the host.

References in periodicals archive ?
Effect of thymol and formic acid against ectoparasitic brood mite Tropilaelaps clareae in Apis mellifera colonies.
A further contribution to the taxonomy of the Trichodinidae (Ciliophora: Peritrichia) and a review of the taxonomic status of some fish ectoparasitic trichodinids.
cyprinacea Linnaeus (Copepoda, Lernaeidae), the anchor worm, is an ectoparasitic copepod that generally infects the gills and skin of various freshwater fishes.
Host-specificity amongst arthropods ectoparasitic upon mammals and birds in the New Hebrides.
For practical reasons it was not possible to examine the interior of fissures, or undertake trapping of bats to ascertain whether the flies are phoretic as adults, a possibility that appears unlikely given that Mormotomyia lacks the modified tarsal claws apparent in fly families known to be phoretic or ectoparasitic on bats (Kirk-Spriggs et al.
Change in host preference with age in the ectoparasitic pyramidellid snail Boonea impressa (Say).
A pest extermination company examined the premises and found no evidence of animal or arthropod infestation, and a veterinarian found no evidence of ectoparasitic infection on examination of the family's pet dog.
Although the exact cause of higher prevalence of hypodermatosis in female buffaloes could not be explained but it could be hypothesized that stresses of production make the buffaloes more susceptible to any ectoparasitic infection as has been reported by Iqbal et al.
The particular groups of root-knot, cyst, endoparasitic and ectoparasitic nematodes are covered.
Catalogue of the ectoparasitic insects of the bats of Argentina.