Since scanning electron microscopy was used to study diatoms, many new ultra-structural features have been observed. This paper describes Cymbella distalebiseriata, a new species of Cymbella which has valves with biseriate striae near both apices of the valve and uniseriate striae at the valve centre. Comparison with some similar taxa supports its erection as new by the following combination of ... [Show full abstract] characters: two to three stigmata, puncta density 25-30 in 10 μm, and ca. 3 to 11 biseriate striae at both apices. C. distalebiseriata is epilithic and lives in freshwater habitats.