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The thick-lipped pebblesnail,
scientific name In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
''Somatogyrus crassilabris'', was a species of
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, 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 ...
. This species was endemic to
Baxter County, Arkansas Baxter County is a county in the U.S. state of Arkansas. As of the 2020 census, the county's population was 41,627. The county seat is Mountain Home. It is Arkansas's 66th county, formed on March 24, 1873, and named for Elisha Baxter, the tent ...
in the United States. Its natural habitat was the north fork of the White River. It is now
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 ...
.


References

Somatogyrus Extinct gastropods Taxonomy articles created by Polbot Endemic fauna of Arkansas Species known from a single specimen Baxter County, Arkansas {{Lithoglyphidae-stub