Cyclonaias pustulosa

Cyclonaias pustulosa is a species of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels. This species is native to North America, where it is a widespread and common.
The species was formerly classified within the genus "Quadrula", and in 2012 it was moved to "Rotundaria" based on genetic evidence. 