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Data on the structure of malacocenoses in unregulated flow of the upper Vyatka and Kama basin are summarized. Freshwater malacofauna is formed by 58 species from 9 families represented mainly by widespread species with European and European–Western Siberian types of distribution range. Mollusks are typical for all benthic ecosystems in the Vyatka River. The maximum species diversity is recorded in...