Savannah pebblesnail
Encyclopedia
The Savannah pebblesnail (Somatogyrus tenax) is a species of gastropod in the Hydrobiidae
Hydrobiidae
Hydrobiidae, common name mud snails, is a large cosmopolitan taxonomic family of very small freshwater snails and brackish water snails that have an operculum, aquatic gastropod mollusks in the clade Littorinimorpha.- Distribution :...

 family. It is endemic to the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

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Source

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