Image of: Triodopsis tridentata (northern three-tooth)
ADW: 092.rjb1.jpg
Caption
Tridopsis tridentata
, Eastern North America. Both genus and species names refer to the three barriers ("teeth') in the shell aperture (not visible here). These barriers keep potential predators out of the shell when the snail is retracted.
Contributors
Dr. John B. Burch, Ph.D.
(photographer, copyright holder), Mollusk Division, Museum of Zoology, University of Michigan
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