Identifying British freshwater snails: Dextral shell with operculum

Freshwater snails » Shell shape » Shell taller than wide » Dextral shell with operculum
 

Shell shape taller than it is wide, with the mouth on the right hand side, and closed by an operculum in the live animal.

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Greater than 25mm. high
and shaped like this ?


Shell rather squat,
(or even flatter) with an
almost circular mouth?


Shell conical and adult
more than 6mm high?


Shell conical and adult
less than 6mm high?