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Answer for the clue "Zebra mussels ", 9 letters:
dreissena

Word definitions for dreissena in dictionaries

Wikipedia Word definitions in Wikipedia
Dreissena is a genus of small freshwater mussels in the family Dreissenidae . The exact taxonomy of the species within the genus Dreissena is, however, uncertain. As Kantor et al. commented, "...the Russian specialists on freshwater molluscs appeared to ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Dreissena \Dreis"se*na\, prop. n. [NL. Named after Dreyssen, a Belgian physician.] (Zo["o]l.) A genus of bivalve shells of which one species ( Dreissena polymorpha ) is often so abundant as to be very troublesome in the fresh waters of Europe.