Abstract
A survey of local livestock in western and southern Saudi Arabia yielded seven indigenous and six introduced tick species and subspecies. The introduced Boophilus annulatus, Hyalomma marginatum rufipes, Amblyomma gemma, Amblyomma variegatum, Hyalomma truncatum and Rhipicephalus evertsi evertsi are well established especially in Jazan and Najran Provinces and their threat to human and domestic animals' health is highlighted. Hyalomma dromedarii is the most abundant and widespread species in the area. Jazan and Najran Provinces proved to be its main regions of distribution in the kingdom. This species coexists on the camel with Hyalomma impeltatum throughout the study area.