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Lampsilis higginsii, Mississippi River, Rock Island County, Illinois. Length: 3.5 inches (8.9 cm) for male (top), 3.0 inches (7.6 cm) for female (bottom).
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Macalester College Biology 476 - Fall 2011
Prairie Research Institute at University of Illinois at Urbana-Champaign (Cummings, K. S. and C. A. Mayer. 1992. Field guide to freshwater mussels of the midwest. Illinois Natural History Survey Manual 5. 194 pp.)
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