Genus Quadrula
Class Bivalvia
: Subclass Paleoheterodonta
: Genus Quadrula
Quadrula pustulosa (Pimpleback)
The pimpleback mussel shell grows to four inches in length, is rounded, covered (posterior half) with knobs called pustules, and has a dark green stripe on the umbo. The surface color varies from yellowish green to light brown, darkening with age.
This species lives in the sand, mud, or gravel of medium to large rivers. It can be found throughout the state of Illinois.
Conservation status: widespread and relatlively common, it is a commercial species.
Taxonomy: Order Unionoida; Superfamily Unionoidea; Family Unionidae; Subfamily Ambleminae
Collection of the Illinois State Museum, photograph by Robert Warren
ISM Accession #: 679839
Class Bivalvia
: Subclass Paleoheterodonta
: Genus Quadrula
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