The Tennessee pebblesnail (''Somatogyrus currierianus'') is a species of very small

freshwater snail Freshwater snails are gastropod mollusks which live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs ...

with an operculum. It is an aquatic

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusc Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is esti ...

in the family

Lithoglyphidae Lithoglyphidae is a family of small freshwater snails with gills and an operculum, aquatic gastropod mollusks. This family is in the superfamily Truncatelloidea and in the clade Littorinimorpha (according to the taxonomy of the Gastropoda by ...

Distribution

This species is endemic to the Tennessee River in Madison County, Alabama in the United States. It is a Critically Endangered species, and possibly

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

having not been reported since the river was impounded. Assessment of its conservation status is encumbered by the difficulty in differentiating the various species of ''Somatogyrus'' from one another. However no specimens of any ''Somatogyrus'' species have been reported in recent surveys.

References

Somatogyrus Endemic fauna of Alabama Endemic molluscs of the United States Critically endangered fauna of the United States Gastropods described in 1863 Taxonomy articles created by Polbot {{Lithoglyphidae-stub