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Abstract
Based on typification in Ehrenberg's original material, the nomenclature and taxonomy of Gyrosigma fasciola (Ehrenberg) J.W. Griffith et Henfrey are discussed. This diatom is compared to two morphologically similar taxa, Gyrosigma sulcatum (Grunow in Cleve & Grunow) Frenguelli and Gyrosigma arcuatum (Donkin) Sterrenburg, which is here recombined on the basis of a type study. It showed that taxonomic continuity has been ensured for Ehrenberg's species for more than 150 years.