Amblyomma cajennense

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Amblyomma cajennense (click on image to enlarge it)
Author(s): Christopher Paddock/ James Gathany CDC
Source: Wikimedia Commons

Amblyomma cajennense (Fabricius, 1787) - (Cayenne tick)

Until 2014, this tick species has been assumed to occur from the southern U.S.A. to Central and South America. It was considered to be a serious pest of livestock in parts of its distribution range and an important disease vector, e.g of Venezuelan equine encephalitis (VEE), with the ability to bite humans.

Following biological, taxonomic and molecular studies it is now regarded as a species complex, e.g. see Labruna et al. (2011). According to the new system, Amblyomma cajennense (sensu stricto) is only found in the Amazonian region of Brazil. The distribution of the other species of this complex is:
Amblyomma interandinum (in parts of Peru)
Amblyomma mixtum (in southern U.S.A. to northern South America)
Amblyomma patinoi (in the eastern Andes of Colombia)
Amblyomma sculptum (in parts of South America, e.g. it is common in southern Brazil)
Amblyomma tonelliae (in southern parts of South America)

Some of these species overlap in their distribution range. Therefore, it is often difficult to assign a definite species to an old distribution record.