Dwarf pebblesnail
The dwarf pebblesnail (Somatogyrus nanus) is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusc in the family Lithoglyphidae. This species is endemic to Alabama in the United States. Its natural habitat is the Coosa River, but it has not been collected since the river was impounded. References

Molluscs of the United States
Somatogyrus
Gastropods described in 1904
Taxonomy articles created by Polbot
Endemic fauna of Alabama