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Burch, Jack
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The shells of these two Michigan species show extremes in shell morphology in the family. Radix on the left is globose, while Acella on the right is more or less needle-shaped.
Dr. John B. Burch, Ph.D. 
(photographer, copyright holder), Mollusk Division, Museum of Zoology, University of Michigan
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Citation: Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed August 29, 2008 at http://animaldiversity.org.
Sponsored in part by the Interagency Education Research Initiative,
the Homeland Foundation and the University of Michigan Museum of Zoology.
This material is based upon work supported by the National Science Foundation under Grants DUE-0633095 and DRL-0628151.
The ADW Team gratefully acknowledges their support. Report Error — Comment
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