Allogona is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of air-breathing land snail

Snail

Snail is a common name applied to most of the members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in its most general sense, it includes sea snails, land snails and freshwater snails. The word snail without any qualifier is however more often...

s, terrestrial

Terrestrial animal

Terrestrial animals are animals that live predominantly or entirely on land , as compared with aquatic animals, which live predominantly or entirely in the water , or amphibians, which rely on a combination of aquatic and terrestrial habitats...

 pulmonate gastropod mollusks 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...

.

The shell of this genus is not distinguishable from the shell of Triodopsis, but the male reproductive anatomy is unusual, and is characteristic for the genus. (The genus name, from Greek, means "different genitalia".)

Species and subspecies

Species and subspecies within the genus Allogona include:

• Allogona profunda
  Allogona profunda
  Allogona profunda is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Polygyridae....
  
  
• Allogona profunda strontiana
• Allogona ptychophora
  Allogona ptychophora
  Allogona ptychophora is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Polygyridae....
  
  
• Allogona ptychophora solida
• Allogona townsendiana
  Allogona townsendiana
  Allogona townsendiana, common name the Oregon forestsnail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Polygyridae.- Distribution and conservation status :...
  
  

The classic treatment of this group by Pilsbry divides the genus into two subgenera: Allogona s.s. for A. profunda

Allogona profunda

Allogona profunda is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Polygyridae....

and its subspecies, and Dysmedoma for the other members of the taxon.