Planorbarius corneus is one of the species which combines two allospecies – "western" and "eastern".The habitats are separated by a wide area of introgressive hybridization. Also was researched the influence of modern , climatic infractions of environment on distribution of elo-species in hydroway of natural-geographical zones of Ukraine. In a result of global warming and infraction happened reduction of general population, density of population and changed life cycle of these shellfishes.