14 Assiminea grayana

14 Assiminea grayana

Only site of 34 examined on Dee Estuary with A. grayana and Potamopyrgus antipodarum intermingled. A. grayana on emergent surface of saturated sponge of decaying vegetation at base of Bolboschoenus maritimus; P. antipodarum in water below.
Salting on Dee Estuary, Cheshire, England.