Stagnicola emarginata. This species is a common inhabitant in our larger lakes in the Great Lakes and southern Ontario region. These shells represent some of the intrapopulational shell variation found in Houghton Lake, Michigan.
John B. Burch (photographer; copyright holder), Mollusk Division, Museum of Zoology, University of Michigan-Ann Arbor
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Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2013. The Animal Diversity Web (online). Accessed at http://animaldiversity.org.
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