Electron-microscopic studies of the phytoplankton in the Kama Reservoir allow us to expand sufficiently the taxonomical list of Centrophyceae (from 16 up to 33 species and varieties). In the northern regions of the Kama basin with large tributaries of the North and Middle Ural new representatives of genera Actinocyclus Ehrenb., Aulacoseira Thw., Discostella Houk et Klee, Sceletonema Grev., Stephanodiscus Ehrenb., Thalassiosira Cleve have been registered including. Peculiarities of the species composition of centric diatoms in the Kama Reservoir as compared to the Votkinsk and Lower Kama reservoirs located southward are shown.

Keywords: Kama Reservoir, phytoplankton, Bacillariophyta, Centrophyceae, electron microscopy

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