Dreissena polymorpha © Bernd Nies
Dreissena polymorpha: Immigrated Zebra mussels (Dreissena polymorpha) on the ground. They came from the black sea and spread here in all lakes. — Nikon D200, Nikkor AF Micro 60mm, 2 x Sea&Sea YS-110α, Hergiswil, Lopper, Lake Lucerne, 29 July 2012. Nikon D200, 1/250 s, F/16.0, 60 mm, ISO 200, Sunday, July 29, 2012 09:52:49