A provisional inventory of achnanthoid, fragilariod, canal-raphe diatoms and the genus Diploneis in Lake Baikal. This volume includes revisions of ditoms from the following genera: Cymatopleura, Nitzschia, Diploneis, Eucocconeis, Karayevia, Nupela, Planothidium, Platessa, Poseudostaurosira and Staurosirella. Two new genera are described: Popovskayella gen. nov. and Skabitschewskia gen. nov. A guideline was to illustrate and name entities than can be easily distinguished from more or less similar taxa living in better investigated regions of the world. This inventory will also allow one to find out where else these Baikal taxa may occur in Eurasia. From a quite small number of samples from the Skabitschewsky collection, others from the International Darwin Initiative Project of 15 years ago, and collections by the authors, 160 species new to science have been identified, in addition to the 222 species described in the first volume already. In this context it must be kept in mind that so far only 12 genera have been studied in detail in a second step of the investigations.
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