The results of the electron-microscopy study of representatives of the class Cetrophyceae from the Neva Bay phytoplankton are presented. 30 taxa from 9 genera have been discovered including 14 species new to the diatom flora of the Neva Bay: Aulacoseira tenella, Cyclotella atomus, C. meduanae, C. tripartita, C. vorticosa, Stephanodiscus alpinus, S. delicatus, S. invisitatus, S. makarovae, S. triporus, S. volgensis, Sceletonema potamos, Thalassiosira weissflogii and T. guillardii.
Keywords: Bacillariophyta, Centrophyceae, algae flora, Neva Bay, Gulf of Finland
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