The karyotype with 50 chromosomes was found in the garden dormouse (El
iomys quercinus) from western Bohemia, Czech Republic. The karyotype i
s similar to chromosomal complements described in this species from Fr
ance, Belgium, and the northern Alps. Karyotypic evolution in Eliomys
quercinus is discussed in relation to postglacial dispersal of the spe
cies from the Mediterranean area.