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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 ?
This research was accomplished starting from an adapted secondary database of CUNHA (2013) and structured with information on the presence and absence of ectoparasites, characteristics from the chicken houses, the poultry, the facilities, the geographical location and the management.
Attached ectoparasites such as mites and ticks, which could not be removed by brushing, were gently dislodged with a pair of thumb forceps and their sites noted [1].
Argus persicus is an important ectoparasite of domestic and wild birds in the world; and play an important role in transmission of spirochaetal diseases in poultry (Buriro, 1979).
Auchenipterus nuchalis showed a parasite community with dominance of ectoparasites (protozoans and monogenoideans) and low presence of endoparasites with heteroxenous life cycle, indicating that this fish might occupy an intermediate trophic level in the food web.
The timing and prevalence of sunbathing by burrowing owls suggests they may have done so to shed ectoparasites rather than to thermoregulate or dry wet feathers based on three lines of evidence.
Les cyamidae etaient presents sur 20 % des 673 baleines qui ont ete examinees dans le but d'y trouver des ectoparasites cyamidae.
Distributional evidence for cospeciation between neotropical bats and their bat fly ectoparasites.
Identification of all bacterial isolates from fish and ectoparasites was performed by studying the phenotypic and biochemical characteristics using both conventional and commercial API 20 E systems following the criteria described in Buller (2004).
Bats also represent a key group for understanding the evolution and ecology of parasitism, because their ectoparasites are often specialized, with many taxa closely associated with particular species of ectoparasites (Dick and Patterson, 2006).
Therefore, crustacean ectoparasites seem to have strong interaction with the environment and host fish population, because these factors are directly involved in their different life cycles and may cause different responses to seasonal fluctuations in water levels.
Additionally, ectoparasites such as fleas and ticks can bite humans, resulting in itchy lesions that are prone to secondary bacterial infection.
The lesions were not generalized and no animals were infested with ectoparasites.