-
- © <p>From the web version of:</p><p>Cummings, K.S., and C.A. Mayer. 1992. Field guide to freshwater mussels of the Midwest. Illinois Natural History Survey Manual 5. 194 pp.</p><p>Located online at http://www.inhs.illinois.edu/animals_plants/mollusk/musselmanual/page106_7.html</p>
- Copyright licence: Released into the public domain
- Provenance: http://media.eol.org/content/2011/11/28/23/95787_orig.jpg