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Chromosomal forms of the Mole Rat, Nannospalax nehringi (Satunin, 1898), from the Van Lake Basin in Eastern Turkey

Abstract Two different chromosomal forms of the Mole Rat, Nannospalax nehringi (Satunin, 1898), have been found in the Van Basin, Eastern Turkey: a population around the city of Van with 2n=48, NF=72 and NFa=68, and a population around the city of Bitlis with 2n=54, NF=74 and NFa=70. Both populations are confined to well-defined distribution areas. While both populations are separated in the south by Mt Süphan, an extinct volcano over 4000 m high, there is no geographic barrier between both populations in the north, and there seems to be a secondary contact zone. The Van population constitutes a new chromosomal form of Mole Rat in Turkey, and could be regarded as a sibling species. However, no taxomomic decision is taken until more evidence on the evolution of these forms has become available.