| Acorn pearly mussel | |
|---|---|
| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Unionoida |
| Family: | Unionidae |
| Genus: | Epioblasma |
| Species: | E. haysiana |
| Binomial name | |
| Epioblasma haysiana (I. Lea, 1834) |
|
| Synonyms | |
|
Dysnomia haysiana I. Lea, 1834 |
|
The acorn pearly mussel or acornshell, Epioblasma haysiana, was a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the pearly mussels, Naiads or unionids.
This species was endemic to the drainages of the Cumberland River and the Tennessee River in the United States. Its natural habitat was rivers. It is now extinct.