Abstract
SUMMARYKaryometric analysis was made of two palaearctic species of bats: Plecotus auritus and Plecotus austriacus. In both species the number of chromosomes was shown to be identical (2N=32) and also the number of arms of the chromosomes (NF = 54, NFa = 50). The relative length of chromosomes in both species are not significantly different. Significant differences, however, were found in the position of centromeres for three pairs of autosomes and X-chromosomes.On the basis of karyological comparisons of palaearctic and nearctic species of the genus Plecotus and palaeontological data, the possible ways of evolution of their karyotypes are discussed.
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