This is a demonstration of the ISM freshwater mussel image gallery.
Class Bivalvia : Subclass Paleoheterodonta : Genus Potamilus
Potamilus capax (Fat Pocketbook)
The interior of the Fat pocketbook mussel shell has white nacre, sometimes tinted with pink or salmon. The beak cavity is deep. Pseudocardinal teeth (upperleft band in image) are thin and compressed. The lateral teeth (above the date on this shell) are also thin and curved. Notice the line of the hinge is S-shaped.
Collection of the Illinois State Museum, photograph by Karen Little
ISM Accession #: 677416
Class Bivalvia : Subclass Paleoheterodonta : Genus Potamilus
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