Sandbar pebblesnail

The Sandbar pebblesnail (Somatogyrus depressus) is a species of very small freshwater snail with an operculum. It is an aquatic gastropod mollusc in the family Lithoglyphidae.

Distribution
This species is endemic to the Mississippi River, Missouri River and their relative watersheds in Wisconsin, Iowa, Illinois and Missouri in the United States. Assessment of its conservation status is encumbered by the difficulty in differentiating the various species of Somatogyrus from one another.