Arcidens wheeleri is a species of freshwater mussels in the family Unionidae, the river mussels. Its common names are the Ouachita rock pocketbook and Wheeler's pearly mussel. The former monotypic genus of Arkansia was named for the state of Arkansas, where the mussel was first discovered.
Clappia umbilicata, the umbilicate pebblesnail, was a species of small freshwater snail that had an operculum, an aquatic gastropod mollusk in the family Lithoglyphidae. This species is now extinct.
The reverse pebblesnail, scientific name Somatogyrus alcoviensis, is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Hydrobiidae.
Somatogyrus is a genus of very small freshwater and brackish water snails that have an operculum, aquatic gastropod micromolluscs in the family Lithoglyphidae.
The Ouachita pebblesnail, scientific name †Somatogyrus amnicoloides, was a species of minute freshwater snail with an operculum, an aquatic gastropod mollusc or micromollusc in the family Hydrobiidae.
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.
The stocky pebblesnail is a species of very small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Its natural habitat is rivers.
The Tennessee pebblesnail is a species of very small freshwater snail with an operculum. It is an aquatic gastropod mollusc in the family Hydrobiidae.
The fluted pebblesnail, scientific name Somatogyrus hendersoni, is a species of very small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to Alabama in the United States. Its natural habitat is rivers.
The atlas pebblesnail is a species of minute freshwater snail that has an operculum, an aquatic operculate gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Its natural habitat is rivers.
The dwarf pebblesnail is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
The Moon pebblesnail, scientific name Somatogyrus obtusus, is a species of very small freshwater snail that has an operculum, an aquatic gastropod mollusc in the family Lithoglyphidae.
The sparrow pebblesnail, scientific name Somatogyrus parvulus, is a species of minute freshwater snail that has an operculum, an aquatic operculate gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Its natural habitat is rivers.
The Tallapoosa pebblesnail, scientific name Somatogyrus pilsbryanus, is a species of very small freshwater snail with an operculum, an aquatic gastropod mollusc in the family Hydrobiidae. This species is endemic to Alabama in the United States. Its natural habitat is rivers. The common name of this pebblesnail refers to the Tallapoosa River, which runs through the states of Georgia and Alabama.
The pygmy pebblesnail, scientific name Somatogyrus pygmaeus, is a species of very small or minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Its natural habitat is rivers.
The quadrate pebblesnail, scientific name Somatogyrus quadratus, is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Its natural habitat is rivers. This species is possibly extinct because there is no recent survey information. It is known to have had a very restricted distribution and there had been a habitat disturbance. This species was endemic to the Tennessee River system and was known to exist from Muscle Shoals and adjacent Shoal Creek, Lauderdale County, Alabama. It has not been reported since the river was impounded. Based on the fact that the species has not been observed since the dams were constructed, it is widely believed that that change in habitat possibly caused the species's extinction.
The rolling pebblesnail scientific name Somatogyrus strengi, is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. Its natural habitat is rivers.
The opaque pebblesnail, scientific name Somatogyrus tennesseensis, is a species of very small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. The natural habitat of this species is rivers.
