• Caption: Common Name: Pistolgrip, Scientific Name: Quadrula verrucosa, Size: 2.44” (6.2 cm) across, Location: Lilliard's Mill, Duck River, Milltown, Tennessee, river mile: ORM179.2, Contact: David Liittschwager, Natural History Photography, 120 Parnassus Avenue #1, San Francisco, CA 94117, cell: 415 531 6882, email: liittschwager@mac.com