Discus (gastropod) explained

Discus is a genus of small air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Discidae, the disk snails.

Distribution

Distribution of the genus Discus include Europe, northern Asia and North America.^[1] The former subgenus Canaridiscus from the Canary Islands off North Africa, which was previously allocated to Atlantica, is now raised to a full genus.

Description

Discus species have small or medium shells with ribs.^[1] The umbilicus is wide.^[1]

Species

Species in this genus include:

subgenus Discus Fitzinger, 1833

• Discus ruderatus Férussac, 1821 – type species^[2]
• Discus whitneyi (Newcomb, 1864) – Forest disc

subgenus Gonyodiscus Fitzinger, 1833

• Discus brunsoni Berry, 1955 – Lake disc
• Discus marmorensis H. B. Baker, 1932 – Marbled disc
• Discus perspectivus J. C. M. von Mühlfeld, 1816^[2]
• Discus rotundatus (O. F. Müller, 1774) – rotund disc^[2]

subgenus ?

• Discus bryanti (Harper, 1881) – saw-tooth disc, sawtooth disc
• Discus catskillensis (Pilsbry, 1896) – angular disc
• Discus clappi (Pilsbry, 1924) – channelled disc
• Discus macclintocki F. C. Baker, 1928 – Iowa pleistocene snail, Pleistocene disc
• Discus nigrimontanus Pilsbry, 1924 – Black Mountain disc
• Discus patulus (G. P. Deshayes, 1830) – domed disc
• Discus selenitoides (Pilsbry, 1890) – file disc
• Discus shimekii (Pilsbry, 1890) – striate disc

Species brought into synonymy^[3] :

• Discus alternata: synonym of Anguispira alternata (superseded combination)
• Discus cronkhitei: synonym of Discus whitneyi (junior subjective synonym)
• Discus gomerensis: synonym of Canaridiscus gomerensis
• Discus laurisilvae: synonym of Canaridiscus laurisilvae
• Discus orientalus: synonym of Calogoniodiscus orientalus (superseded combination)
• Discus perelegans: synonym of Calogoniodiscus perelegans (superseded combination)
• Discus rupivagus: synonym of Canaridiscus rupivagus
• Discus serratus: synonym of Priodiscus serratus (superseded combination)
• Discus victorianus: synonym of Radiocentrum victoriana (superseded combination)
• Discus vorticella: synonym of Ctenophila vorticella (superseded combination)

Notes and References

1. http://www.animalbase.uni-goettingen.de/zooweb/servlet/AnimalBase/home/genus?id=635 "Genus summary for Discus"
2. http://www.animalbase.uni-goettingen.de/zooweb/servlet/AnimalBase/list/species?taxongenus=320 "Species in genus Discus
3. MolluscaBase eds. (2022). MolluscaBase. Discus Fitzinger, 1833. Accessed through: World Register of Marine Species at: https://www.molluscabase.org/aphia.php?p=taxdetails&id=851153 on 20 June 2023