Abstract: | Variability of absolute fecundity of nematode Thominx neopulchra from three species of genus Myotis was studies on the territory Zhiguli State Reserve in 2007, 2008. Significant differences in the fecundity of the nematode females depending on host species and sex, size of the parasite, number of the helminthes in a given host, and season of year were revealed. |