Atlas of livestock parasites
digitized collection of microscopical preparations

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Ornithodoros spp.



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Ornithodoros spp.

General Description:
These are soft ticks with or without eyes and no scutum present. The lateral margins of the body are rounded without a distinctive limit between the dorsal and ventral side of the tick. The tampans are temporary parasites which are usually found in native huts and in the sand under the trees. These ticks are extremely hardy under conditions of lack of food, some species surviving from five to seven years without feeding.

Life Cycle:

The female lays eggs in batches which are usually preceded by a blood feeding. The eggs are extremely resistant and well protected by an impermeable secretion from the female tick. After an incubation period that goes from 7 days to a month, larvae hatch and remain quiescent until they molt to the nymphal stage. Several nymphal stages are passed through, and the nymphs like the adults attack their hosts only to feed for short periods of time.

Temporarily all parts of an animal exterior.

Geographical Distribution:
Africa, India, the Near East, North and South America.

In addition to annoying cattle, species of Ornithodoros can cause the death of young calves when attacking in large numbers.

Effects on Host:
Irritation and restlessness are caused by the bites of nymphs and adults. O. coriaccus has been implicated in the transmission of epidemic bovine abortion.

Diagnostic Information:

Nymphs and adults may be found attached to the skin of cattle or other animals. These parasites are attracted by CO2; therefore, dry-ice traps could be utilized to determine their presence in dirt or sand.

Ivermectin has been found to be effective in the control of Ornithodoros savignyi.


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