Stenotrema is a genus of gastropod in the family Polygyridae

Polygyridae

Polygyridae is a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea.The Polygyridae make up a significant proportion of the land snail fauna of eastern North America, and are also found in western North America, northern Central America, and...

. These are typically small to medium snails, with a velvety or hairy surface and a narrow aperture

Aperture (mollusc)

The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where part of the body of the animal emerges for locomotion, feeding, etc....

, usually closely guarded by well-developed "teeth".

Distribution

The genus occurs throughout most of North America, from Alaska, though Canada and the United States, into Mexico.

Species

It contains the following species and subspecies:

• Stenotrema altispira (Pilsbry, 1894)
• Stenotrema angellum Hubricht, 1858
• Stenotrema barbigerum (Redfield, 1856)
• Stenotrema blandianum (Pilsbry, 1903)
• Stenotrema brevipila (Clap, 1907)
• Stenotrema burringtoni Grimm, 1971
• Stenotrema calvescens Hubricht, 1961
• Stenotrema cohuttense (Clapp, 1914)
• Stenotrema deceptum (Clapp, 1905)
• Stenotrema depilatum (Pilsbry, 1895)
• Stenotrema edgarianum (Lea, 1841)
• Stenotrema edvardsi (Bland, 1856)
• Stenotrema exodon (Pilsbry, 1900)
  • Stenotrema exodon turbinella (Clench & Archer, 1933)
• Stenotrema florida
  Stenotrema florida
  Stenotrema florida is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Polygyridae....
  
  Pilsbry, 1940
• Stenotrema hirsutum
  Stenotrema hirsutum
  Stenotrema hirsutum, common name hairy slitmouth, is a species of land snail, a gastropod in the family Polygyridae....
  
  (Say, 1817)
  • Stenotrema hirsutum barbatum (Clapp, 1904)
• Stenotrema hubrichti
  Stenotrema hubrichti
  Stenotrema hubrichti is a species of a land snail, a gastropod in the Polygyridae family. It is endemic to the United States....
  
  Pilsbry, 1940 / Euchemotrema hubrichti (Pilsbry, 1940)
• Stenotrema labrosum (Bland 1862)
• Stenotrema magnifumosum (Pilsbry, 1900)
• Stenotrema maxillatum (Gould, 1848)
• Stenotrema pilsbryi (Ferriss, 1900) - Pilsbry's narrow-apertured land snail
  Pilsbry's narrow-apertured land snail
  Pilsbry's narrow-apertured land snail, Stenotrema pilsbryi, is a species of gastropod in the Polygyridae family. It is endemic to the United States....
  
  
• Stenotrema pilula (Pilsbry, 1900)
• Stenotrema simile Grimm, 1971
• Stenotrema spinosum (Lea, 1830)
• Stenotrema stenotrema (Pfeiffer, 1842)
• Stenotrema unciferum (Pilsbry, 1900)
• Stenotrema unciferum caddoense (Archer, 1935)
• Stenotrema waldense Archer, 1938

See Euchemotrema

Euchemotrema

Euchemotrema is a genus of small, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Polygyridae.-Shell description:The shell of species in this genus is usually about 8 to 11 mm in diameter...

for other closely related taxa, many of which are sometimes placed in Stenotrema.