Elliptio is a genus of freshwater mussels belonging to the family Unionidae. These bivalve mollusks are primarily found in rivers and streams across North America. They play a crucial role in aquatic ecosystems by filtering water and providing habitat for various organisms. Members of the Elliptio genus are characterized by their elongated, oval-shaped shells, which can vary in color from yellow to dark brown. They are important indicators of water quality, as their presence often signifies a healthy environment. Conservation efforts are essential to protect these species from habitat loss and pollution.