Information on some ecological features of eight species of pond snails belonging to the subgenera Peregriana and Radix (Lymnaea ampla (Hartmann), L. ampullacea (Rossmässler), L. auricularia (L.), L. balthica (L.), L. fontinalis (Studer), L. lagotis (Schrank), L. ovata (Draparnaud), and L. tumida (Held)) in the waterbodies of south of Western Siberia is presented. The patterns of the species distribution and their cooccurrence in different waterbodies have been studied. An analysis of the quantitative variables (abundance and biomass) of the snails in the waterbodies of the Karasuk lake-river system and in the Novosibirsk Reservoir has been performed.