''Rotundaria tuberculata'', commonly called the purple wartyback, is a freshwater mussel, an 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, bival ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

. This species is native to eastern North America, generally in the

Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it f ...

drainage, where it is wide-ranging. It is still common in many areas, particularly in the southern part of its range. It was formerly classified as the sole species in the genus '' Cyclonaias'', but in 2012 it was moved to ''Rotundaria'' based on genetic evidence.

References

Molluscs of the United States tuberculata Bivalves described in 1820 Taxa named by Constantine Samuel Rafinesque {{Unionidae-stub