''Epioblasma personata'', the round combshell or fine-rayed pearly mussel, is an

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

species of freshwater mussel in the family Unionidae. It was

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the drainages of the

Tennessee River The Tennessee River is the largest tributary of the Ohio River. It is approximately long and is located in the southeastern United States in the Tennessee Valley. The river was once popularly known as the Cherokee River, among other names, ...

and

Ohio River The Ohio River is a long river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing southwesterly from western Pennsylvania to its mouth on the Mississippi River at the southern tip of Illino ...

in the

United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...

. Little is known about the habitat of this species beyond its preference for medium-sized rivers. It appears to have been particularly sensitive to water quality degradation, and its populations diminished quickly after industrialization. No live individuals have been seen since the 1924.NatureServe Explorer
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References

Extinct bivalves personata Bivalves described in 1829 Taxonomy articles created by Polbot {{Unionidae-stub