14 Potamopyrgus antipodarum

14 Potamopyrgus antipodarum

Freshwater pool containing P. antipodarum, salinity 0 ‰, with filamentous algae over bare sand which is black and anaerobic below its surface. Just above EHWS. Bolboschoenus maritimus beyond log in image.
Dee Estuary, Cheshire, England. September 2011.