Abstract
This scanning electron microscopy study was carried out to investigate the morphology of representatives of the diatoms Navicula cryptocephala, N. metareichardtiana and N. upsaliensis from the phytoperiphyton of 6 tributaries of the Svir River (Lake Ladoga basin). Some of the studied quantitative (valve width, number of striae and lineolae in 10 µm) and qualitative (shape of the central area, striae arrangement) characteristics showed a wider variability, which made it possible to refine the diagnoses of these species taking into account the literature data.
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