Savannah pebblesnail
The Savannah pebblesnail, scientific name Somatogyrus tenax, is a species of freshwater snail, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Somatogyrus tenax may actually be a junior synonym of Somatogyrus virginicus, although the taxonomy remains in dispute. Sources

Endemic molluscs of the United States
Somatogyrus
Freshwater snails
Gastropods described in 1969
Taxonomy articles created by Polbot