Rotundaria Pustulosa
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''Cyclonaias pustulosa'' is a
species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
of freshwater mussels, 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 ...
s 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 ''Quadrula'' is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae native to rivers of the American Midwest and mid-south. All have thick nacreous shells with well-developed hinge teeth, many also with external she ...
'', and in 2012 it was moved to ''Rotundaria'' based on genetic evidence.


References

*Williams, J. D.; Bogan, A. E.; Garner, J. T. (2008). Freshwater mussels of Alabama and the Mobile Basin in Georgia, Mississippi and Tennessee. University of Alabama Press, Tuscaloosa. 908 pp. Unionidae Molluscs of North America Fauna of the Great Lakes region (North America) Fauna of the Southeastern United States Bivalves described in 1831 {{Unionidae-stub