Potamopyrgus antipodarum. Specimen with spiral keel following the whorls. Keel overgrown with encrustation, so stout shell outline. Aperture closed by operculum. Shell height 4.5mm. Freshwater pool at top of salting, Dee Estuary, Cheshire.

Submitted by Ian Smith on Sat, 17/09/2011 11:57
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I.F. Smith
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