[Geographic distribution features of subgenus and life forms of Lymnaeidae (Gastropoda, Pulmonata) in Eastern Europe].

ABSTRACT

Relative species richness as a ratio of species number known from the teritory norther than polar circle and species number in Eastern Europe as a whole was calculated from all subgenuses and life forms of the Lymnaeidae. The largest value of this character typical for amla-like life form. The dominance of one life form is a result of its adaptation to life in places with wave activity and for water respiration. Large relative species richness of subgenuses Lymnaea and Peregriana is a sequence of ampla-like life form dominance, wuch consist from these subgenuses.