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Observations of the genus Cyclotella (Kützing) Brébisson in ancient lakes Ohrid and Prespa and a description of two new species C. paraocellata sp. nov. and C. prespanensis sp. nov.

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Several taxa from the genus Cyclotella observed in two ancient sister lakes, Prespa and Ohrid were studied and compared to the regionally common species Cyclotella ocellata. Two new species are described from Lake Prespa and additionally Cyclotella thienemannii var. minuscula from Lake Ohrid is formally transferred to Cyclotella minuscula (Jurilj) Cvetkoska stat. nov. Cyclotella paraocellata sp. nov. is compared to C. ocellata and is characterized by a large morphological variability in the fossil and recent diatom assemblages. Cyclotella prespanensis sp. nov. is described and distinguished as a separate taxon by its valve size range, colliculate central area, stria density and number and position of marginal fultoportulae and rimoportulae. The investigation reveals C. ocellata and C. minuscula as the only taxa of the genus Cyclotella present in fossil and contemporary diatom assemblages from both Lake Ohrid and Lake Prespa.
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Document Type: Research Article

Publication date: May 1, 2014

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  • Nova Hedwigia is an international journal publishing original, peer-reviewed papers on current issues of taxonomy, morphology, ultrastructure and ecology of all groups of cryptogamic plants, including cyanophytes/cyanobacteria and fungi. The half-tone plates in Nova Hedwigia are known for their high quality, which makes them especially suitable for the reproduction of photomicrographs and scanning and transmission electron micrographs.
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