Ouachita pebblesnail

The Ouachita pebblesnail, scientific name †Somatogyrus amnicoloides, was a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Hydrobiidae.

Ouachita pebblesnail
Conservation status
Extinct  (IUCN 3.1)[1]
Presumed Extinct  (NatureServe)[2]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Lithoglyphidae
Genus:	Somatogyrus
Species:	†S. amnicoloides
Binomial name
†Somatogyrus amnicoloides Walker, 1915

The species was endemic to the United States. Its natural habitat was rivers, and it was named after the Ouachita River. The species is now extinct.