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Species AbstractThe bivalve Etheria elliptica is a freshwater mollusc in the family Etheriidae. The adults of this taxon lack a foot, and the mantle/shell is dorso-ventrally elongated. The species esophagus is unusually long. This bivalve thrives in rapidly moving, turbulent rivers, and is known from the Congo, Nile and Niger Basins, as well as from a limited extent of the central Kunene River in Angola. It is threatened by proposed dam construction on the Kunene River. It also occurs in a portion of Madagascar.