As I understand it, the gastropod Genus: Stagnicola consists of 3 species in Western Europe, S. corvus, S. fuscus and S. palustris (the 3 were previously lumped together as Lymnaea palustris).

Contemporary literature seems confused as to whether S. corvus is a valid species and, if so, whether it is present in Britain, or that the British species are actually S. palustris and S. fuscus. Does anybody have any insight as to the true state of this taxonomy?

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