Identification
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Caption
Valvata species from the North American Great Lakes region. The Valvatidae are a family of small aquatic prosobranch snails, characterized by a multispiral operculum, and an animal with a pallial tentacle and a protrusible bipectinate gill.
Dr. John B. Burch, Ph.D.
(photographer, copyright holder), Mollusk Division, Museum of Zoology, University of Michigan
