Abstract
The valve morphology, morphological variability and ultrastructure of Cyclotella delicatula Hustedt from the type material are described with light and scanning electron microscopic methods. The species, based on its valve morphology and ultrastructure, belongs to the Cyclotella taxa with marginal fultoportulae on ribs, valve central area without areolae, the rimoportula(e) is/are situated nearer to the center than the marginal fultoportulae and all the ribs have the same thickness and in the same plane. Differences with other similar taxa are discussed.
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