Pleurobema avellanum, the hazel pigtoe, was a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
| Pleurobema avellanum | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Unionida |
| Family: | Unionidae |
| Genus: | Pleurobema |
| Species: | †P. avellanum |
| Binomial name | |
| †Pleurobema avellanum Simpson, 1900 | |
This species was endemic to the United States. It is now extinct.