Rolling pebblesnail
The rolling pebblesnail scientific name Somatogyrus strengi, is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Its natural habitat is rivers. References

Molluscs of the United States
Somatogyrus
Gastropods described in 1906
Taxonomy articles created by Polbot