Megalovalvata baicalensis is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Valvatidae, the valve snails.
Distribution This species occurs in lake Baikal in depths from 3 to 50 m, and in the Angara River in Russia.
The type locality is Lake Baikal ("Baikalsee").
Habitat This snail lives in freshwater habitats.
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