A hinge view could be helpful in pinning down whether the smallest one
is a big sphaeriid or a small Corbicula. It's also usful for unionids,
but Strophitus undulatus sounds plausible. As the type of Strophitus,
it actually is a Strophitus, unlike S. subvexus and S.
connasaugaensis.
--
Dr. David Campbell
425 Scientific Collections Building
Department of Biological Sciences
Biodiversity and Systematics
University of Alabama, Box 870345
Tuscaloosa AL 35487-0345 USA
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