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A parasite that lives on the exterior of its host.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Risk of ectoparasitism and genetic diversity in a wild lesser kestrel population.
Little is known about the frequency of water mite ectoparasitism (Acari: Hydrachnida) within and among damselfly species of Central Florida.
However, the effects of ectoparasites on nestling growth and survival, and hence the importance of ectoparasitism in the evolution of avian reproductive strategies, seems to vary widely among and between host species.
Ectoparasitism and the trade-off between current and future reproduction.
Aural haematoma results due to constant shaking and rubbing of ear due to otitis, ectoparasitism, ottorrhoea, foreign bodies, hypersensitivity and allergic dermatitis which leads to rupture of pinnal blood vessels resulting in haematoma formation (Ahiwar et al., 2007).
Additionally, capturing and manipulating birds provides valuable information for studies that involve morphometry, molt schedule, fecal analysis, endo and ectoparasitism, migration and genetics.
Experimental trials have shown that these biological agents can prove promising in clinical cases of ectoparasitism, when standardized for commercial formulations
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.
Differential diagnoses include the previously mentioned predisposing factors, as well as ectoparasitism (e.g.
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.