Abstract
Absolute and relative weight characteristics of 25 species of three-host exophilic ticks from 5 genera (Ixodes, Haemaphysalis, Dermacentor, Rhipicephalus, Hyalomma) have been compared. Ixodes and Haemaphysalis species differ from Hyalomma species by having lighter unfed females, heavier eggs and, hence, considerably smaller interstage compensatory growth. Ixodes and Haemaphysalis species considered in this paper are typical forest ticks while the Hyalomma species are typical ticks of open areas. Dermacentor and Rhipicephalus species by some absolute weight parameters (egg weight and unfed adult body weight, respectively) are similar to forest ticks but, according to the relative weight characteristics (weight ratios between unfed females and eggs, and between engorged and unfed nymphal ticks), they seem to be closer to the ticks of open areas. In Hyalomma, Dermacentor and Rhipicephalus species, the compensatory growth is mainly realized through a large weight increase during nymphal feeding. Several patterns of weight increase during feeding at each developmental stage are distinguished.
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