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We report new records for the inadequately known Southern birch mouse  Sicista subtilis  in Poland. This species was found in Poland in 1994 by catching a live specimen by hand and to date there has been no other data on this species. The Polish population is most likely an isolated population of  S. subtilis  but its taxonomic status has not been studied yet. According to our results, it is a morphometric variation or a new subspecies of  S. subtilis . Its craniometrical size is in general smaller than that of the Ukrainian “core” population. Morphometrically, it is similar to the  S. subtilis  trizona  living in Hungary. It is probable that the size reduction and the microevolutionary divergence in morphometry most likely result from a long isolation in the case of  trizona  or a shorter isolation of the Polish population. However, the geographic isolation of the Polish subpopulations in the Lublin region has not been adequate to produce significant morphologic variation in the crania. Hypothetically, the Polish specimens with smaller skulls may also be affected by differences in prey base, which is reflected in the different habitats. The craniometrical characteristics of the geographically most isolated Hungarian  trizona  population are the smallest in the superspecies  S. subtilis .

mammalia

Distribution of the Southern birch mouse ( Sicista subtilis ) in East-Poland: Morphometric variations in discrete European populations of superspecies  S. subtilis