Which family classification distinguishes *D. polymorpha* taxonomically from native North American freshwater mussels?

Dreissenidae

The specific assignment of *Dreissena polymorpha* to the family Dreissenidae, rather than the family Unionidae, reflects deep underlying biological distinctions that drive its invasive capability. While both groups are bivalves, the text notes that belonging to Dreissenidae separates them from the native North American Unionidae species. This taxonomic difference points directly to significant variances in physiological tolerance and reproductive strategy. For instance, the Unionidae are generally characterized as slow-growing and long-lived, adapted to stable ecosystems. In contrast, the Dreissenidae possess rapid reproduction rates and the specialized planktonic veliger stage, allowing for the massive dispersal and rapid colonization that defines the Zebra Mussel threat.