Fluctuating asymmetry of pholidosis in grass snakes found on four areas of the Republic of Tatarstan is considered in this article. We carried out the statistical analysis of asymmetrical traits and counted the integral characteristics of fluctuating asymmetry. Asymmetry of pholidosis was observed in 32% of individuals. Asymmetry in features which are characterized by highest diversity (temporal, postorbital and sublabial scutes) is more common. There are no statistically significant sex, age or population differences in the values of fluctuating asymmetry.
