[Evolution of the basic types of life cycle in ixodid ticks (Ixodidae)].

The burrow-nest life scheme of ixodid ticks, which was formed at the beginning of the Chalk, gave rise to the subsequent types of parasitism: pasture (end of the Chalk), pasture-burrow (end of Paleogene) and pasture-stall one (late Neogene). Changes in the climate in different geological epochs and regions together with the hosts' evolution, natural selection in the aggregate of variability and heredity of ixodids in their populations were the cause of the evolution.