On the findings of abnormal shells of the pond snail Lymnaea stagnalis (Linnaeus, 1758) on the territory of the Republic of Khakassia and south of Krasnoyarsk territory

On the basis of more than 9000 thousand copies of shells of the Lymnaea stagnalis the results on the level of teratogenesis in the South of the Krasnoyarsk territory and the Republic of Khakassia are given. The comparative analysis of shells with normal and abnormal development is carried out. The anomalies in the structure of the shell are considered in detail and the classification of the encountered anomalies is proposed.