Swan mussel
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The swan mussel, Anodonta cygnea, is a large species of freshwater mussel, an aquatic bivalve mollusc in the family Unionidae, the river mussels.
Anodonta cygnea 1
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Left valve
Duck mussel
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The duck mussel is a species of freshwater mussel in the family Unionidae, the river mussels.
Swan mussel
…is thin but large (approximately 10 to 20 cm) and rather flat, even at the umbo. The shell color is often pale greenish or brownish. It differs from Anodonta anatina in being larger shell with straighter, more parallel dorsal and ventral margins; the growth lines of the inner, oldest part of the shell are finer and…
Anodonta anatina 1
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Left valve