The bicolor cactus snail (''Xerarionta tryoni'') is a species of

land snail A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. ''Land snail'' is the common name for terrestrial molluscs, terrestrial gastropod mollusks that have gastropod shell, shel ...

in the family

Helminthoglyptidae The Helminthoglyptinae are a subfamily of air-breathing land snails, terrestrial pulmonate gastropod mollusks within the family Xanthonychidae.MolluscaBase eds. (2021). MolluscaBase. Helminthoglyptinae Pilsbry, 1939. Accessed through: World Reg ...

. This species is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

to the United States.

References

Molluscs of the United States Xerarionta Gastropods described in 1864 Taxonomy articles created by Polbot {{Helminthoglyptidae-stub