The birdwing pearlymussel (''Lemiox rimosus'') is a rare

species In biology, a species is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of ...

freshwater mussel Freshwater bivalves are one kind of freshwater mollusc, along with freshwater snails. They are bivalves that live in fresh water as opposed to salt water, which is the main habitat type for bivalves. The majority of species of bivalve molluscs ...

in the family

Unionidae The Unionidae are a family of freshwater mussels, the largest in the order Unionida, the bivalve molluscs sometimes known as river mussels, or simply as unionids. The range of distribution for this family is world-wide. It is at its most dive ...

, the river mussels. This aquatic

bivalve Bivalvia (), in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. As a group, biv ...

is native to

Tennessee Tennessee ( , ), officially the State of Tennessee, is a landlocked state in the Southeastern region of the United States. Tennessee is the 36th-largest by area and the 15th-most populous of the 50 states. It is bordered by Kentucky to ...

and

Virginia Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the East Coast of the United States, Atlantic Coast and the Appalachian Mountains. The geography an ...

in the United States. Its range has declined over 90%.''Lemiox rimosus''.
The Nature Conservancy. It is a federally listed endangered species of the United States. This mussel remains in three rivers in Tennessee and Virginia, the

Duck Duck is the common name for numerous species of waterfowl in the family Anatidae. Ducks are generally smaller and shorter-necked than swans and geese, which are members of the same family. Divided among several subfamilies, they are a fo ...

Clinch Clinch may refer to: * Nail (fastener) or device to hold in this way * Clinching, in metalworking * Clinch fighting or the clinch, a grappling position in boxing or wrestling, a stand-up embrace * Clinch County, Georgia, USA * Clinch River, near T ...

, and Powell Rivers, having been

extirpated Local extinction, also known as extirpation, refers to a species (or other taxon) of plant or animal that ceases to exist in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinct ...

from many more. It is now extinct in the state of

Alabama (We dare defend our rights) , anthem = " Alabama" , image_map = Alabama in United States.svg , seat = Montgomery , LargestCity = Huntsville , LargestCounty = Baldwin County , LargestMetro = Greater Birmingham , area_total_km2 = 135,7 ...

. Failed efforts to transplant the birdwing pearly mussel and the

Cumberland monkeyface pearly mussel ''Theliderma intermedia'', the Cumberland monkeyface pearly mussel or Cumberland monkeyface, is a species of freshwater mussel in the family Unionidae, the river mussels. This aquatic bivalve mollusk is native to Tennessee and Virginia in the ...

, also endangered, to local streams brought an end to construction on the half-completed and long-contested Columbia Dam on the Duck River in 1983.

References

Natural history of Tennessee Natural history of Virginia Lemiox Bivalves described in 1831 Taxa named by Constantine Samuel Rafinesque ESA endangered species Taxonomy articles created by Polbot {{Unionidae-stub