12 Potamopyrgus antipodarum.

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12 Potamopyrgus antipodarum.

Ribbing inside aperture is sturdy leaflets of ctenidium (gill). Extensive white pigment marks on sides of foot and posterior of head, with a few white marks extending to the eye, and patch of white in front of eye on tentacle.
Shell height 3.8 mm. May 2013. Freshwater slack at top of salting, Dee Estuary, Cheshire.

Imprint

Photographic guide to the identification and biology of European marine invertebrates

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