Similar species Pondmussel , pondhorn, Texas lilliput . Description Shell small, slightly elongate, thin to moderately thick, compressed in males and inflated in females. Dorsal margin straight, ventral margin straight to slightly curved. Umbos elevated above the hinge line. Beak sculpture of four to seven distinct, double-looped bars.
Lateral teeth elongate, thin, and straight.
Nacre white or bluish white, occasionally tinged with salmon, iridescent posteriorly. Habitat Small to medium streams in sand or gravel. Status Widespread but uncommon in the Ohio River drainage. Endangered in Illinois and Ohio. Species of Special Concern in Indiana.