Appearance
The quagga mussel shell is striped, as is that of the zebra mussel, but the quagga shell is more pale toward the end of the hinge. There is a large range of shell morphologies, including a distinct morph in Lake Erie that is pale or completely white. The quagga is slightly larger than the zebra mussel, about 20 millimetres (0.8 in) wide, roughly about the size of an adult human's thumbnail. The quagga has a rounded carina and a convex ventral side.
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—Ralph Waldo Emerson (1803–1882)