Ouachita pebblesnail

{{Short description|Species of gastropod}}

{{Use dmy dates|date=July 2020}}

{{Speciesbox

| name = Ouachita pebblesnail

| image =

| status = EX

| extinct = yes

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Mollusc Specialist Group |year= 2000 |title= Somatogyrus amnicoloides |page= e.T20350A9189869 |doi=10.2305/IUCN.UK.2000.RLTS.T20350A9189869.en|access-date=20 February 2023}}

| status2 = GX

| status2_system = TNC

| status2_ref = {{cite web |title=Somatogyrus amnicoloides |url=https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.107431/Somatogyrus_amnicoloides |website=NatureServe Explorer An online encyclopedia of life |version=7.1|publisher=NatureServe|accessdate=20 February 2023}}

| genus = Somatogyrus

| species = amnicoloides

| authority = Walker, 1915

| synonyms =

}}

The Ouachita pebblesnail, scientific name †Somatogyrus amnicoloides, was a species of small freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Hydrobiidae.

The species was endemic to the United States. Its natural habitat was rivers, and it was named after the Ouachita River. The species is now extinct.