Epioblasma stewardsonii

Epioblasma stewardsonii, the Cumberland leafshell or Steward's pearly mussel, is an extinct species of freshwater mussel in the family Unionidae.

Epioblasma stewardsonii
Conservation status
Extinct  (IUCN 2.3)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Unionida
Family:	Unionidae
Genus:	Epioblasma
Species:	†E. stewardsonii
Binomial name
†Epioblasma stewardsonii (I. Lea, 1852)
Synonyms
Dysnomia stewardsoni I. Lea, 1852

This species was endemic to the drainages of the Cumberland River and the Tennessee River in the United States. Its natural habitat was riffle areas in large- to medium-size rivers. Like most other members of this sensitive genus, it became extinct due habitat destruction and pollution. The last documented occurrence of this species was in 1909.^[2]

It appears to be most closely related to Epioblasma flexuosa, which is also now extinct.^[3]