The Tumbling Creek cavesnail is a species of freshwater cave snail with gills and an operculum, an aquatic gastropod mollusk in the family Amnicolidae.
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 phantom cave snail or phantom cavesnail is a species of very small freshwater snail with an operculum, an aquatic gastropod in the family Hydrobiidae.
The Moapa pebblesnail also known as the Muddy Valley turban snail, scientific name Pyrgulopsis avernalis, is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Pyrgulopsis is a genus of freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Hydrobiidae.
The Crystal Spring springsnail, scientific name Pyrgulopsis crystalis, is a species of small freshwater snail, an aquatic gastropod mollusk in the family Hydrobiidae.
The Davis County springsnail, scientific name Pyrgulopsis davisi, is a species of small freshwater snails with a gill and an operculum, aquatic gastropod mollusk in the family Hydrobiidae.
The Ash Meadows pebblesnail is a species of freshwater snail with a gill and an operculum, aquatic gastropod mollusk in the family Hydrobiidae.
The Gila springsnail, scientific name Pyrgulopsis gilae, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
The corded purg, scientific name Pyrgulopsis nevadensis, is an extinct species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Marstonia ozarkensis, common name the Ozark pyrg, is a species of very small or minute freshwater snails with an operculum, aquatic gastropod molluscs in the family Hydrobiidae. This species was endemic to Missouri and Arkansas in the United States and was presumed extinct by the U.S. Fish and Wildlife Service as of December 2018.
The Jackson lake springsnail, scientific name Pyrgulopsis robusta, 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 shell is 4.6 to 7.5 millimetres high and 1.48 to 2.10 millimetres wide, which is large for this genus. It has 4.5 to 6.25 whorls, and is clear-white with a tan periostracum.
The brown springsnail, scientific name Pyrgulopsis sola, is a species of very small freshwater snail that has a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to Arizona, the United States.
The Socorro springsnail, scientific name Pyrgulopsis neomexicana, is an endangered species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae, the mud snails.
Marstonia is a genus of freshwater snails with a gill and an operculum, aquatic gastropod molluscs in the family Hydrobiidae.
Pyrgula annulata is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Pyrgophorus spinosus, common name the spiny crownsnail, is a species of very small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Pyrgulopsis deserta is a species of freshwater snail in the family Hydrobiidae, the mud snails. It is known by the common names desert springsnail, Virgin springsnail, and St. George snail. It occurs in southwestern Utah and northwestern Arizona in the United States.
Marstonia comalensis is a species of minute freshwater snail with a gill and an operculum, an aquatic gastropod mollusk or micromollusk in the family Hydrobiidae. It is found in south central Texas, United States.
Pyrgulopsis archimedis, commonly known as the archimedes pyrg, is a species of minute freshwater snails with an operculum, aquatic gastropod molluscs or micromolluscs in the family Hydrobiidae.
