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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 ?
Risk of ectoparasitism and genetic diversity in a wild lesser kestrel population.
Field variation in ectoparasitism may be associated with damselfly symmetry, should the stressful conditions during larval growth (e.
Species and sex biases in ectoparasitism of dragonflies by mites.
Given perspective alarms farmers, scientists, and policy makers to take measures in combating the challenges instigated by ectoparasitism.
alfreddugesi, its large variety of hosts, and their medical importance with respect to humans, it is important to document the biological and ecological relationships of ectoparasitism by this mite on the herpetofauna of this region.
Such levels of ectoparasitism are realistic in a rural habitat; for example, in 1 night in our study in Gologolo, a basic light trap caught 26 fleas in a single room.
Because different cliffs within a given colony showed important variations in local reproductive success associated with local effects of ectoparasitism and predation (see Danchin and Monnat 1992 and results of assumption 1), all the analyses in this paper used those cliffs as the spatial units of breeding habitat.
ricinus on migratory birds is a common characteristic of ectoparasitism (34,35), including infestation with ticks (36).
In the present paper, I report results from both laboratory and field studies on the effect of ectoparasitism by the mite, Macrocheles subbadius Berlese, on the physiological condition of male Drosophila nigrospiracula Patterson and Wheeler.
Effect of ectoparasitism by larvae of the blow fly Protocalliphora parorum (Diptera: Calliphoridae) on nestling house wrens, Troglodytes aedon.
Mechanical constraints on oviposition imposed by the mere physical presence of mites are therefore unlikely to be the major cause of reduced fecundity of infested females demonstrated in Ectoparasitism and female fecundity in the laboratory.