Abstract
This scanning electron microscopy study of phytoplankton from the watercourses and water bodies of the Mordyyakha River basin (Yamal Peninsula) has made it possible to expand the taxonomic spectrum of Bacillariophyta: a total of 281 taxa of specific and intraspecific ranks of diatom algae of 63 genera have been identified. Among them, 14 species and varieties are new for the flora of Russia and 30 forms of the 14 genera have been identified only to the genus level. The highest taxonomic diversity is recorded in Lake Pebtavyto (116) and the channel between two lakes (125). Diatoma tenuis, Encyonema silesiacum, Fragilaria vaucheriae, Tabellaria flocculosa, and Ulnaria ulna are the most widespread in the studied water bodies.
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