Andy,
Have you shared Rob Dillon's chapter on Freshwater Gastropoda with him?
It's in a book entitled The Mollusks: A Guide to Their Study, Collection,
and Preservation.
If that doesn't answer his question, he might try e-mailing Rob or Amy
Wettington.
Regards,
Charlie
.................................................
Research Associate - Section of Mollusks
Carnegie Museum of Natural History
Pittsburgh, PA, USA
Assistant Professor - Family Medicine
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