The Santa Cruz cypress is a species of North American tree within the cypress family. The species is endemic to the Santa Cruz Mountains within the Santa Cruz and San Mateo counties of west-central California. The U.S. Fish and Wildlife Service listed the species on the Endangered Species Act in 1987 due to increasing threats from habitat loss and disruption of natural forest fire regimes. In 2016, the conservation status of the Santa Cruz cypress changed to Threatened. The cited reasoning was a decrease in threats against their habitat.
The Kanab ambersnail, formerly classified as Oxyloma haydeni kanabense or Oxyloma kanabense, is a small, air-breathing land snail belonging to the family Succineidae, the ambersnails. This terrestrial pulmonate gastropod mollusc was previously considered a critically endangered subspecies or species. In 2013, a scientific investigations report by the United States Geological Survey concluded that the Kanab ambersnail is not a genetically distinct species. In June 2021, the Fish and Wildlife Service removed the Kanab ambersnail from the United States Fish and Wildlife Service list of endangered mammals and birds and classified it with other common ambersnails within the same taxa, officially negating its status as a distinct subspecies.
Achatinella livida is a critically endangered species of air-breathing land snail in the family Achatinellidae. This species is endemic to Oʻahu, Hawaiʻi.
The Tumbling Creek cavesnail is a species of freshwater cave snail with gills and an operculum, an aquatic gastropod mollusk in the family Amnicolidae.
Inflectarius is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Polygyridae.
Leptoxis ampla, common name the round rocksnail, is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Pleuroceridae.
The painted rocksnail is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Pleuroceridae.
Lioplax cyclostomatiformis, the cylindrical lioplax, is a species of freshwater snail with gills and an operculum, an aquatic gastropod mollusk in the family Viviparidae.
Fumonelix archeri is a species of land snail in the family Polygyridae known commonly as Archer's toothed land snail and Ocoee covert. It is endemic to Tennessee in the United States, where it is known only from Goforth Creek in Polk County.
Fumonelix jonesiana is a species of land snail in the family Polygyridae. Its common names are Jones' middle-toothed land snail and big-tooth covert. It is native to North Carolina and Tennessee in the United States, where it occurs in Great Smoky Mountains National Park.
Millerelix peregrina is a species of land snail in the family Polygyridae. It is known by the common names strange many-whorled land snail and white liptooth. It is endemic to Arkansas in the United States, where it is found in Izard, Marion, Stone, Newton, and Searcy County in the Ozark Mountains. It occurs in dolomite cliff habitat.
Polygyriscus is a genus of minute air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Polygyridae. This is a monotypic genus of snails containing the single species Polygyriscus virginianus, known commonly as the Virginia fringed mountain snail or the Virginia coil. That species is endemic to the State of Virginia in the United States.
Rich Mountain slitmouth or Pilsbry's narrow-apertured land snail, scientific name Stenotrema pilsbryi, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Polygyridae. This species is endemic to Ouachita Mountains of the United States.
The flat-spired three-toothed snail —also known as the Cheat three-toothed snail after the Cheat River in West Virginia—is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Polygyridae.
Tryonia alamosae, common name the Alamosa springsnail, is a species of small freshwater snail, an aquatic prosobranch gastropod mollusk in the family Hydrobiidae.
Brune's tryonia, scientific name Tryonia brunei, is a species of very small freshwater snail that has a gill and an operculum, an aquatic gastropod mollusc in the family Hydrobiidae. This species is endemic to the United States (Texas). It was formerly listed as Threatened in 1993/1994 and Data Deficient since 1996 until it was changed to Critically Endangered and possibly extinct in 2012; this is because it is found only in Phantom Lake, Balmorhea Lake, has range of less than 100 km², and was last observed in 1993. A 1991 report by the United States Fish and Wildlife Service also listed it as Endangered and they also later noted the unknown population. It is found in firm substratum and on mud before modification.
The Utah roundmouth snail, also known as the Utah valvata or desert valvata, scientific name Valvata utahensis, is a species of freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Valvatidae, the valve snails.
Villosa trabalis, the Cumberland bean pearly mussel, Cumberland bean, or purple bean, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae.
Cryptomastix devia, common name the Puget Oregonian snail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Polygyridae.
Patera clarki nantahala, the noonday globe, is a subspecies of Patera clarki, a land snail in the family Polygyridae. It is endemic to North Carolina in the United States.
