Variability of the pond snail Lymnaea stagnalis (Gastropoda) from the reservoir of the Askiz river valley (Yenisei river basin)

The brief report contains a list of statistical indicators characterizing the variability in five conchological parameters of the shell of the pond snail Lymnaea stagnalis (Linnaeus, 1758). For their calculations, 217 shells were studied, collected in a reservoir in the river valley. Askiz (Yenisei River basin). The listed values complement the regional cadastral data base describing the size-age variability of pond snails.