Reverse pebblesnail

The reverse pebblesnail, scientific name Somatogyrus alcoviensis, is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Hydrobiidae.

Reverse pebblesnail
Conservation status
Extinct (outdated[1])  (IUCN 3.1)[2]
Critically Imperiled  (NatureServe)[3]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Lithoglyphidae
Genus:	Somatogyrus
Species:	†S. alcoviensis
Binomial name
†Somatogyrus alcoviensis Krieger, 1972

This species is endemic to Newton County, Georgia^[3] in the United States, where it occurs in the Alcovy and Yellow Rivers. It was believed extinct until it was rediscovered in a 2000 survey.^[1]