About the Border between Two Phylogroups of the Common Hamster (Cricetus cricetus) (Cricetinae, Rodentia)

The Common hamster (Cricetus cricetus) is the rodent with one of the largest range (6 million km2). There were four phylogenetic lineages earlier recovered in Western Europe, Ukraine and Bryansk Province of Russia: “North”, “Рannonia”, E1 and E0. E1 was previously reported from South-Eastern Poland and Western Ukraine and never been found in sympatry with “Pannonia” although the closest distance between them was estimated as 20 km. The question is whether the sympatry of E1 and E0 phylogroups exists?