DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
The swan mussel, Anodonta cygnea, is a bivalve mollusk that lives in fresh stationary waters. Its two large identical shells are thin and fragile. It can extend a kind of extremity or foot that allows it to move around a bit. The swan mussel is native to the European-Siberian mainland but spreading out to North Africa. Actual length of specimen here shown is 12 cm.
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