In the phytoplankton of water bodies and watercourses of the Far North of Western Siberia (Gydansky Peninsula, Yamal Peninsula, Tazovsky Peninsula) seven representatives of the genera Fallacia and recently described Pseudofallacia Y. Y. Liu, J.P. Kociolek et Q.X. Wang have been recorded using scanning electron microscopy. They include a new for the science species Pseudofallacia makarovae Genkal & Yarushina sp. nov. In Fallacia pygmae Kütz., F. forcipata Grev., F. subhamulata (Grev.) D.G. Mann, and Pseudofallacia tenera (Hustedt) Liu, Kociolek et Wang the ranges of variability of valve lengths and widths, and the number of striae in 10 µm agree with the literature data. Representatives of Fallacia insociabilis (Krasske) D.G. Mann and Pseudofallacia losevae (Lange-Bertalot, Genkal et Velhov) Liu, Kociolek et Wang had some morphological differences comparing to protologues. The newly described species P. makarovae has much in common with P. losevae and Fallacia muraloides (Hust.) D.G. Mann, however differs from them in the size of central area reaching the valve margins. Our data supplement information on ecology and distributionon of revealed representatives of the genera Fallacia and Pseudofallacia.

Keywords: Fallacia, Pseudofallacia, Bacillariophyta, Far North of West Siberia, morphology, electron microscopy

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