Coosa pebblesnail
The Coosa pebblesnail, scientific name Somatogyrus coosaensis, is a species of small freshwater snails with a gill and an operculum,  aquatic gastropod mollusks in the family Lithoglyphidae. This species is endemic to Alabama in the United States. Its natural habitat is the Coosa River. Although the IUCN officially categorises the species as Critically Endangered, it also considers it as Possibly extinct, as it has not been recorded in several dozen years. This latter classification is also supported by The Nature Conservancy. References

Endemic molluscs of the United States
Somatogyrus
Gastropods described in 1904
Taxonomy articles created by Polbot
Endemic fauna of Alabama