Abstract

An invader leech species Archaeobdella esmonti (Clitellata: Hirudinida) was found during hydrobiological research in 2016 in the Volga and Volga-Kama reaches of the Kuybyshev Reservoir. This indicates the continuing process of spreading of this alien leech species in the Kuybyshev Reservoir and the colonization of new habitats on a considerable area of the upstream part of the reservoir. The article describes the occurrence and quantitative abundance of A. esmonti in the studied water area.

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