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Abstract
Stephanodiscus kuetzingii Klee & Casper, described from a Pleistocene deposit in the Lüneburger Heide, Lower Saxony, Germany (Kützing type material for Cyclotella minutula), was found living in Rapel Reservoir, Central Chile. There are no published records of living material for this species. Its valve morphology was studied using light and scanning electron microscopy. The morphological features of the Chilean specimens are in good agreement with those of S. kuetzingii described by Klee and Casper. The present study provides additional information on rimoportula structure, in which a long external tube was observed, as well as on the presence of a narrow circumferential hyaline area at the valve face/mantle junction of convex valves. The similarities and differences between S. kuetzingii and other closely related Stephanodiscus species are discussed.