Turbo annulatus Linnaeus, 1758 Melania helvetica Michelin, 1831 Pyrgula helvetica (Michelin, 1831) Pyrgula annulata is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

Pyrgula annulata is the type species of the genus Pyrgula.

This species occurs in Switzerland, Italy, Croatia, and Albania.

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