Discus 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 small air-breathing land snail

Land snail

A land snail is any of the many species of snail that live on land, as opposed to those that live in salt water and fresh water. Land snails are terrestrial gastropod mollusks that have shells, It is not always an easy matter to say which species are terrestrial, because some are more or less...

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 Discidae

Discidae

Discidae is a taxonomic family of small air-breathing land snails, terrestrial gastropod mollusks in the superfamily Punctoidea.-Genera:The family Discidae has no subfamilies...

, the disk snails.

Distribution

Distribution of the genus Discus include Europe, northern Asia and North America.

Description

Discus species have small or medium shell

Gastropod shell

The gastropod shell is a shell which is part of the body of a gastropod or snail, one kind of mollusc. The gastropod shell is an external skeleton or exoskeleton, which serves not only for muscle attachment, but also for protection from predators and from mechanical damage...

 with ribs. The umbilicus is wide.

Species

Species in this genus include:

subgenus Discus Fitzinger

Leopold Fitzinger

Leopold Joseph Franz Johann Fitzinger was an Austrian zoologist.Fitzinger was born in Vienna and studied botany at the university of Vienna under Nikolaus Joseph von Jacquin...

, 1833

• Discus ruderatus
  Discus ruderatus
  Discus ruderatus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Discidae, the disk snails.- Distribution :THis species occurs in:* Czech Republic...
  
  Férussac, 1821 - type species

subgenus Gonyodiscus Fitzinger, 1833

• Discus perspectivus
  Discus perspectivus
  Discus perspectivus is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Discidae, the disk snails.- Distribution :This species occurs in:* Czech Republic...
  
  J. C. M. von Mühlfeld, 1816
• Discus rotundatus
  Discus rotundatus
  Discus rotundatus is a species of small, air-breathing, land snail, a terrestrial pulmonate gastropod mollusk in the family Discidae, the disk snails.-Distribution:...
  
  (O. F. Müller, 1774) - rotund disc

subgenus ?

• Discus brunsoni Berry
  Samuel Stillman Berry
  Samuel Stillman Berry was a U.S. marine zoologist specialized on cephalopods.He was born in Unity, Maine but the family home was the Winnecook Ranch in Montana, which had been founded by his father Ralph in 1880. In 1897, he moved with his mother and two cousins to Redlands, California.Berry...
  
  , 1955 - Lake Disc
• Discus bryanti (Harper, 1881) - saw-tooth disc, sawtooth disc
• Discus catskillensis
  Discus catskillensis
  Discus catskillensis, common name angular disc, is a species of small air-breathing land snail, a terrestrial gastropod mollusk in the family Discidae, the disk snails....
  
  (Pilsbry, 1896) - angular disc
• Discus clappi (Pilsbry, 1924) - channelled disc
• Discus engonatus
  Discus engonatus
  Discus engonatus is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Discidae, the disk snails....
  
  Shuttleworth, 1852 - extinct
• Discus ganodus Mabille
  Jules François Mabille
  Jules François Mabille was a French malacologist who discovered several species of molluscs....
  
  , 1882
• Discus gomerensis Rähle, 1994
• Discus guerinianuss R. T. Lowe, 1852
• Discus kompsus J. Mabille, 1883
• Discus macclintocki
  Discus macclintocki
  The Iowa Pleistocene snail, also known as the Pleistocene disk, scientific name Discus macclintocki, is a very small air-breathing land snail, a terrestrial pulmonate gastropod mollusk....
  
  F. C. Baker, 1928 - iowa pleistocene snail, Pleistocene disc
• Discus marmorensis H. B. Baker, 1932 - Marbled Disc
• Discus nigrimontanus Pilsbry
  Henry Augustus Pilsbry
  Henry Augustus Pilsbry was an American biologist, malacologist and carcinologist, among other areas of study. He was a dominant presence in many fields of invertebrate taxonomy for the better part of a century...
  
  , 1924 - Black Mountain disc
• Discus patulus (G. P. Deshayes
  Gérard Paul Deshayes
  Gérard Paul Deshayes was a French geologist and conchologist.He was born in Nancy, his father at that time being professor of experimental physics in the École Centrale of the Meurthe département....
  
  , 1830) - domed disc
• Discus putrescens (R. T. Lowe
  Richard Thomas Lowe
  Richard Thomas Lowe was a British botanist, ichthyologist, malacologist, and clergyman. In 1825 he graduated from Christ's College, Cambridge and in the same year took holy orders. He became a clergyman in the Madeira Islands in 1832, where he was a part-time naturalist, extensively studying the...
  
  , 1861)
• Discus retextus
  Discus retextus
  Discus retextus is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Discidae, the disk snails.Discus retextus is considered to be extinct.- Distribution :...
  
  Shuttleworth, 1852
• Discus scutula
  Discus scutula
  Discus scutula is a species of small air-breathing land snail, a terrestrial gastropod mollusk in the family Discidae, the disk snails.This species is endemic to Spain....
  
  Shuttleworth, 1852
• Discus selenitoides (Pilsbry, 1890) - file disc
• Discus shimekii (Pilsbry, 1890) - Striate Disc
• Discus textilis
  Discus textilis
  Discus textilis is an extinct species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Discidae, the disk snails.Discus textilis is considered to be extinct.- Distribution :...
  
  Shuttleworth, 1852 - extinct
• Discus whitneyi (Newcomb, 1864) - Forest Disc