Zebra-mussel meaning

A small freshwater mussel (Dreissena polymorpha) usually having a striped shell, native to the Black and Caspian Seas but now widespread in European and North American lakes and rivers.
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A small, European freshwater mussel (Dreissena polymorpha) that clusters densely on surfaces, clogging water-supply lines, encrusting boat hulls, etc.: it was carried to the Great Lakes in the mid-1980s.
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A striped mussel, Dreissena polymorpha, originating in Russia.

Zebra mussels are causing significant problems as an invasive species in North America.

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