Genus Pleurobema
Class Bivalvia
: Subclass Paleoheterodonta
: Genus Pleurobema
Pleurobema sintoxia (Round Pigtoe)
Round pigtoe mussel, also called Pleurobema coccineum (Rafinesque, 1820), has a thick, rounded shell. It grows to four inches in length. The smooth surface is reddish brown, light brown, or greenish brown in young shells, becoming darker in adults. Rays may be visible near the beak. This species lives in the mud, sand, and gravel of medium to large rivers. It occurs throughout Illinois.
Conservation status: widespread but uncommon
Taxonomy: Order Unionoida; Superfamily Unionoidea; Family Unionidae; Subfamily Ambleminae
Collection of the Illinois State Museum, photograph by Karen Little
ISM Accession #: 677263
Class Bivalvia
: Subclass Paleoheterodonta
: Genus Pleurobema
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