Stenotrema labrosum

Stenotrema labrosum
	An Ozark slitmouth shell collected in Polk County, Arkansas
Conservation status
	; Vulnerable (NatureServe)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Polygyridae
Genus:	Stenotrema
Species:	S. labrosum
Binomial name
	Stenotrema labrosum; (Bland, 1862)
Synonyms
	Helix labrosa Bland, 1862 (original combination) ; Polygyra labrosa Bland, 1852 (superseded combination) ; Stenotrema abaddona Branson, 1964 (unaccepted) ; Stenotrema glassi Branson, 1964 (unaccepted) ;

Stenotrema labrosum, also known as the Ozark slitmouth, is a species of pulmonate land snail in the family Polygridae.

Physical appearance

The Ozark slitmouth's shell ranges from 10 to 12.5 mm (0.39-0.49 in) in diameter and averages 6.5 mm (0.26 in) in height. The base of the shell can range from a yellowish-cinnamon to a dark brown, and it is covered with the fine, thin hairs typical of species in the Stenotrema genus. The shell is imperforate and lenticular with a defined carina and convex-conoid spire. The base of the shell is softly rounded. The aperture is narrow and a linguiform tooth extends across the entirety of the parietal wall. There is a large notch in the center of the basal margin.^[1]^[2]

Ecology

The Ozark slitmouth is endemic to the United States, where it has been found in Iowa, Missouri, Arkansas, Oklahoma, and Louisiana. It is listed as vulnerable globally and as imperiled in Arkansas.^[3] The species is most commonly found in leaf litter or on or under rocks and logs along moist wooded hillsides and ravines.^[4] They may also be found along well-shaded limestone, sandstone, or talus slopes.^[1]

References

^ ^a ^b Branson, B. A. (1964). Records and two new species, Stenotrema abaddona and S. glassi, from Oklahoma. The Nautilus. 77(3): 100, 102 (figs.)-105.
^ Bland, T. (1861). Remarks on certain species of North American Helicidae. Annals of the Lyceum of Natural History of New York. 7(30): 420-446 (Dec. 1861), 7(31): 447-448, plate 4 (Feb. 1862).
^ "Stenotrema labrosum". NatureServe Explorer 2.0. Retrieved 2025-01-29.
^ Hubricht, Leslie (1985). The distributions of the native land mollusks of the Eastern United States. Field Museum of Natural History.

[:0-1] Branson, B. A. (1964). Records and two new species, Stenotrema abaddona and S. glassi, from Oklahoma. The Nautilus. 77(3): 100, 102 (figs.)-105.

[2] Bland, T. (1861). Remarks on certain species of North American Helicidae. Annals of the Lyceum of Natural History of New York. 7(30): 420-446 (Dec. 1861), 7(31): 447-448, plate 4 (Feb. 1862).

[3] "Stenotrema labrosum". NatureServe Explorer 2.0. Retrieved 2025-01-29.

[4] Hubricht, Leslie (1985). The distributions of the native land mollusks of the Eastern United States. Field Museum of Natural History.

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