Ornithodoros

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Ornithodoros is a genus in the soft-bodied tick family, Argasidae. It is distinguished from other genera in the family by the absence of a lateral 'suture' line.[1] It is the largest genus within Argasidae, consisting of approximately 130 species.[2] Ornithodoros ticks are parasitic associates of shelter-seeking vertebrates, such as mammals, birds and reptiles.[3]

Prior to its reclassification in 1844, the genus Ornithodoros was described under the genus Argas.[3]

Physiology

File:SEM image of ventral view of female Ornithodoros (Pavlovskyella) tartakovskyi..png
SEM image of ventral view of female Ornithodoros (Pavlovskyella) tartakovskyi[4]

The opening between the midgut and hindgut has been lost, preventing these ticks from excreting digestive waste products from their bodies.[5]

Habitat

The genus Ornithodoros have been documented worldwide, with the highest occurrence in the Paleartic realm.[3]

Life Cycle

The life cycle of all species of Ornithodoros is parasitic and relies on one or multiple hosts,[6] most of which are shelter-seeking vertebrates, and can also parasitize humans.[7] Mating and moulting occur in close proximity to sites frequented by the hosts, such as nests.[6] Once a larvae hatches, it seeks out a host for its first meal of blood. After feeding for several hours to days, it detaches and molts into a nymph. The nymph will then reattach to a host and repeat the cycle for up to seven instars. Once it reaches adulthood, it continues to feed on the hosts multiple times.

Some Ornithodoros species can reproduce multiple times and may also exhibit autogeny.[8] The life span of some species may extend up to ten years.[8]

Disease

Due to their status as obligate hematophages, Ornithodoros ticks are constantly exposed to blood-borne pathogens.[9] When feeding on a host, small amounts of their saliva may enter the host and transmit infections. Ornithodoros is commonly recognized as a vector for tick-borne relapsing fever.[6] In addition to transmitting bacteria such as Borrelia, it is also responsible for causing relapsing fever.[7] Species of Ornithodoros are also known to transmit the African Swine Fever Virus,[10] which causes African swine fever in pigs or other closely related animals such as wild boars.[10]

Taxonomy

The Linnean name derives from ornithos (Template:Langx) and doros (Template:Langx), meaning "bird" and "gift", respectively.

It contains these species:[11]

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Carios erraticus was previously placed in this genus, as Ornithodoros erraticus.

References

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