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Abstract
A new diatom species, Cyclotella wulfiae, is described from the brackish lake Grosser Binnensee, Germany. The new species is distinguished by its size, the concentric undulation of the valve face centre, 2–14 valve face fultoportulae scattered or organized in a ring, lack of spines, gentle angle of the valve face/mantle junction and the varied width of the internal costae, a new feature in Cyclotella. Comparison of the fine structure with the closely related species C. meneghiniana, C. gamma and C. quillensis showed that the combination of characters of C. wulfiae does not belong to any of the previously described species. C. wulfiae was found only once (July 1975) associated with abundant C. meneghiniana.