Lithasia

Lithasia is a genus of medium-sized freshwater snails, aquatic gilled gastropod molluscs in the family Pleuroceridae. This genus is endemic to rivers in the mid-southern United States.

Species
Species within the genus Lithasia include:
 * Armigerous river snail (Lithasia armigera)
 * Knobby rocksnail (Lithasia curta)
 * Dutton's river snail (Lithasia duttoniana)
 * Geniculate river snail (Lithasia geniculata)
 * Jay's river snail (Lithasia jayana)
 * Elk River file snail (Lithasia lima)
 * Muddy rocksnail (Lithasia salebrosa)
 * Varicose rocksnail (Lithasia verrucosa)