Bacillariophyta species composition from two lakes in East Siberia was investigated. In one of them Psammothidium vernadskyi Bukht. et Stanislavskaya sp. nov. was found. The diagnosis, illustrations and other necessary material for the new taxon attributes are provided. Typification of new species and infraspecific taxa of Bacillariophyta is discussed.

Keywords: new species, morphology, taxonomy, nomenclature type, holotype, paratype, diatom species typification, small lakes, algal-bacterial mats

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