Abstract
The valve morphology of taxa from the Cymbella cistula group from different water ecosystems of southern Siberia (Russia) and northwestern Mongolia is investigated. Two species with similar morphology, C. neocistula Krammer and C. nepalensis (Juttner & Van de Vijver) Vishnjakov stat. nov., are found. C. nepalensis differs from C. neocistula by valve outline and a usually higher number of stigmata on the central area. The morphological variability of species from C. cistula complex, their ecology, and distribution are discussed.
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