Atlas of livestock parasites
digitized collection of microscopical preparations

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Gasterophilus spp.



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Bots (Gasterophilus intestinal and

Gasterophilus nasalis) are the larval

stages of the non-feeding adult bot fly or

nit fly. The adult fly deposits her eggs on

the hairs of the legs, mane, or body and

under the chin of the horses. The horses

ingest the larvae that develops from the

eggs when licking and then the fly bots

eventually develop in the stomach of the horse. To complete the cycle, the bot larvae pass

out in the feces and develop into the bot fly that starts the cycle over again. Bot larvae

seldom are associated with any health problems in the horse.


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