Abstract
This paper focuses on study of benthic diatoms of the sand beach of Kruglaya (Omega) Bay of the Black Sea. For the first time, diatom algae of epipsammon were studied in an electron scanning microscope. 14 Bacillariophyta taxa representing 8 genera were found, of which 6 species of the genus Cocconeis Ehrenberg (C. guttata, C. pinnata, C. placentula, C. pseudodebesii, C. scutellum, Cocconeis sp.) prevailed. Of the diatoms, 6 species, Anorthoneis arthus-bertrandi, A. dulcis, Cocconeis guttata, Coscinodiscus concinnus, Diplomenora cocconeiformis and Pseudostaurosira medliniae were found in Black Sea coastal waters for the first time. Original and literature data on species morphology, variability of shell and shell size, occurrence, ecology and geography of distribution in different areas of the World Ocean are presented. 55 SEM-microphotographs of all diatom species from different angles are presented.
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