The first data about Bacillariophyta of Lake Donuzlav are present. 40 species were found in plankton of Lake Donuzlav. Four taxa (Actinocyclus subtilis (W. Greg.) Ralfs in Pritchard, Achnanthes subsessilis Kütz., Amphora mexicana A. Schmidt, Plagiotropis lepidoptera (W. Greg.) Kütz. var. intermedia Kisselev) are new for the flora of Ukraine. Reality of variety Plagiotropis lepidoptera (W. Greg.) Kütz. var. intermedia Kisselev emend. Lilitsk. et P. Tsarenko was confirmed; the diagnosis of the taxon was supplemented. Dominant complex of planktonic algae was fixed for freshwater and saline parts of Lake Donuzlav.

Keywords: Bacillariophyta, species composition, dominant complex, new taxa, flora of Ukraine, diagnostic features

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