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Abstract
A new species, Stephanodiscus khurseviczae, has been found in Lake Baikal in sediments from the Pleistocene. The diameter of the cells of this species varies between 12.5 and 28 μm. Areolae are placed densely and evenly over the valve surface and there are no distinct fascicles of areola rows. The foramina of the areolae have a characteristic form: polygons with rounded corners. There are one to four valve face fultoportulae (with two or three satellite pores) near the centre. Some characters of this species are similar to those of diatoms described earlier: to S. grandis Churs. & Log., in the arrangement of areolae; to S. binatus Håkansson & Kling, in the form of foramina. However, there are enough differences between the new species and those described earlier to justify its separation.