01 Potamopyrgus antipodarum

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01 Potamopyrgus antipodarum

Shell heights 4.5 mm to 1.1 mm. Deep sutures and tumid whorls. Left specimen is keeled (1). All encrusted with black mineral deposits, except most recent whorl of growing juveniles (2).
Freshwater pool on salting. Dee Estuary, Cheshire, England.

Imprint

Photographic guide to the identification and biology of European marine invertebrates

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