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Pseudoleyanella is a marine monotypic genus belonging to Cymatosiraceae.In its original description, the morphology ofPseudoleyanella lunata Takano was noted to be similar to that of Leyanella but differed in its lunate valve shape and absence ofpili and tubular processes.In this study, we observed P lunata throughout its life cycle and noted the variable and stabile components of the diatoms valve morphology.