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For this study, 15 males and 13 females of Glis glis (Linnaeus, 1766) were captured from Gilan Province in southwest of the Caspian. We examined the karyotype of Glis glis from Iran for the first time, and found 2n=62, NF=124 and NFa=120. The X chromosome was metacentric and the Y chromosome was a dot-like acrocentric. It was determined that there were 12 nipples in females. Counts of embryos and newborns suggested a litter size range of 3-5 (n= 3). Iranian dormice have larger body and skull measurements than other populations from Europe and the Caucasus, and represent a subspecies G. g. persicus (Erxleben, 1777). The phallus and baculum properties and bio-ecological notes are given. [ABSTRACT FROM AUTHOR]