Characterization of shell proportions of Lymnaea stagnalis (Mollusca; Gastropoda) - a pond snail from the Tasheba river (Yenisei river basin)

Two groups of proportionality coefficients of Lymnaea stagnalis (Linnaeus, 1758) from the Tasheba River (Yenisei River basin) are characterized. The difference between these groups of indices consists in the variants of using mollusk shell height values for the calculation of the eight coefficients. In the first case, the results of shell height measurements were used as the numerator. In the first case, they were also used as denominators. The obtained coefficient values are recommended for comparative analysis of morphometric parameters of L. stagnalis. They can also be used to support activities related to biological monitoring.