Thick-lipped pebblesnail

The thick-lipped pebblesnail, scientific name Somatogyrus crassilabris, was a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Lithoglyphidae. This species was endemic to Baxter County, Arkansas in the United States. Its natural habitat was the north fork of the White River. It is now extinct.

Thick-lipped 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. crassilabris
Binomial name
†Somatogyrus crassilabris Walker, 1915