Pyrgulopsis
Pyrgulopsis milleri
Pyrgulopsis californiensis
Pyrgulopsis deserta
Pyrgulopsis carinifera
Pyrgulopsis bryantwalkeri
Pyrgulopsis archimedis
Pyrgulopsis aardahli
Pyrgulopsis perforata
Pyrgulopsis arizonae
Duckwater pyrg
Pyrgulopsis blainica
Pyrgulopsis sanchezi
Kingman springsnail
Gila springsnail
Pyrgulopsis castaicensis
Chupadera springsnail
Huachuca springsnail
Montezuma Well springsnail
Pyrgulopsis licina
Moapa pebblesnail
Pyrgulopsis bedfordensis
Phantom cave snail
Fairbanks springsnail
Crystal Spring springsnail
Davis County springsnail
Brown springsnail
Corded purg
Roswell springsnail
Grand Wash springsnail
Jackson lake springsnail
Page springsnail
South Sierra Nevada springsnail
Pyrgulopsis minkleyi
Ash Meadows pebblesnail
Fossil springsnail
Transverse grand pyrg
Pecos springsnail
New Mexico hotspring snail
Bruneau hot springsnail
San Bernardino springsnail
Median-gland Nevada springsnail
Oasis Valley springsnail
Distal-gland springsnail
Three Forks springsnail
Elongate-gland springsnail
Naegele springsnail
Socorro springsnail
Verde Rim springsnail
Amargosa springsnail
Marstonia scalariformis
Marstonia pachyta
Marstonia olivacea
Marstonia castor
Marstonia ogmorhaphe
Marstonia ozarkensis
Marstonia agarhecta