The Wichita Mountains pillsnail (''Euchemotrema wichitorum'') is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of air-breathing land snail, a terrestrial

pulmonate Pulmonata or pulmonates, is an informal group (previously an order, and before that a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group includ ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

in the family

Polygyridae Polygyridae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. MolluscaBase eds. (2021). MolluscaBase. Polygyridae Pilsbry, 1895. Accessed through: World Register of Marine Species a ...

. The species is

endemic Endemism is the state of a species being found 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 found elsew ...

Oklahoma Oklahoma (; Choctaw language, Choctaw: ; chr, ᎣᎧᎳᎰᎹ, ''Okalahoma'' ) is a U.S. state, state in the South Central United States, South Central region of the United States, bordered by Texas on the south and west, Kansas on the nor ...

, the United States.

Description

''Euchemotrema wichitorum'' was first described in 1972 by Branley A. Branson as ''Stenotrema wichitorum.'' The shell varies from light tan to dark brown. It has an average diameter of 8.3 mm and an average height of 4.6 mm. It is the second smallest species of its genus.

Distribution and habitat

It is endemic to the

Wichita Mountains The Wichita Mountains are located in the southwestern portion of the U.S. state of Oklahoma. It is the principal relief system in the Southern Oklahoma Aulacogen, being the result of a failed continental rift. The mountains are a northwest-southea ...

area in southwest

. The type locality is located in the Wichita Mountains Wildlife Refuge. Originally only being known from two counties, it has now been located in seven counties in southwest Oklahoma. It favors oak dense woodlands rather than the granite boulder fields of the area. They have a fire association, and

charred Charring is a chemical process of incomplete combustion of certain solids when subjected to high heat. Heat distillation removes water vapour and volatile organic compounds ( syngas) from the matrix. The residual black carbon material is char, as d ...

logs shelter more live snails than uncharred counterparts. High severity fires lead to high mortality, due to sheltered locations being burned. The charring of the wood converts less usable calcium oxalate into usable calcium ions and calcium carbonate, which is likely the reason for the fire association. The Wichita Mountains Wildlife Refuge protects a large amount of the range, and the refuge's regular prescribed fires are likely beneficial to ''Euchemotrema wichitorum.''

References

{{Taxonbar, from=Q3735420 Polygyridae Molluscs of the United States Endemic fauna of Oklahoma Gastropods described in 1972