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Abstract
Cymbellonitzschia minima Hustedt is a common species in the benthic algal communities of Lake Tanganyika. It is found mostly on sandy shores, where it lives as an epipsammic organism. The presence of large populations has made a morphological study by light and scanning electron microscopy possible. One of the previously accepted differences with C. diluviana Hustedt, viz. the position of the raphe, seems to have no value; 58% of the valves of C. minima had the raphe on the dorsal side, 42% had the raphe on the ventral side of the valve. Scanning electron microscopic study showed some difference between the two taxa mentioned above.
