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Phylogenetic analysis and assessment of the species status of mostly isolated populations of    Pholidoptera   frivaldszkyi    in south-western Russia occurring far beyond the accepted area of the species distribution in the Carpathian-Balkan region were performed. Using the mitochondrial DNA cytochrome  c  oxidase subunit I gene fragment, we found a very low level of genetic diversity in these populations. Phylogeographic reconstruction did not support recent introduction events but rather historical range fragmentation. The grouping of the Russian and Romanian haplotypes in a distinct phylogenetic clade suggests that the pre-glacial range of    P.   frivaldszkyi    had extended towards the Ponto-Caspian region, with considerable gene flow between different refugia. However, post-glacial northward expansion of the species from supposed Caucasus refugia contributed most likely to the current disjunct distribution of this relict-like bush-cricket.

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Isolated populations of the bush-cricket    Pholidoptera   frivaldszkyi    (  Orthoptera  ,   Tettigoniidae  ) in Russia suggest a disjunct area of the species distribution