Description of the proportions of the shell of the Lymnaea stagnalis (Mollusca; Gastropoda) from the estual area of the Abakan river (Yenisei river basin)

The values of eight proportionality coefficients of the shell of Lymnaea stagnalis (Linnaeus, 1758), a mollusk inhabiting the estuary section of the Abakan River (basin of the Yenisei). The values of the coefficients are recommended for a comparative analysis of the morphometric parameters of L. stagnalis. They can also be used to accompany research activities related to biological monitoring of reservoirs and watercourses in the South Siberian region.