The size, weight and sexual structure of several populations of mature individuals of the common spadefoot was analyzed in five lakes of the Medveditsa floodplain (Saratov Region, Lysogorsky District) in 2009 - 2016. The body length of the males participating in reproduction ranged from 29.0 to 56.0 mm (the weight from 2.35 to 20.87 g), and that of females ranged from 29.3 to 59.2 mm (the weight from 2.64 to 22.33 g). In most P.