title: A comparative study of shell variation in two morphotypes of Lymnaea stagnalis (Mollusca: Gastropoda: Pulmonata)
abstract: Lymnaea stagnalis (L., 1758), the great pond snail, is among the most common and ubiquitous species of aquatic pulmonate gastropods of Palearctic. It is notorious for its enormous conchological variation, and many students tried to separate varieties, subspecies and even distinct species within the L. stagnalis s. l. Recent molecular studies have revealed that there are at least two genetically indistinguishable morphotypes of L. stagnalis in Palearctic that earlier were accepted by some authors
journal: Zoological studies