Choanomphalus

Choanomphalus is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails, or planorbids. All species in this genus have sinistral or left-coiling shells.

Choanomphalus
An apertural view of the shell of Choanomphalus maacki
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Superorder:	Hygrophila
Family:	Planorbidae
Subfamily:	Planorbinae
Tribe:	Planorbini
Genus:	Choanomphalus Gerstfeldt, 1859[1]

Species

Species within the genus Choanomphalus include:

• Choanomphalus amauronius Bourguignat, 1860^[2]
  • Choanomphalus amauronius angulatus (B. Dybowski & Grochmalicki, 1925)^[2]
  • Choanomphalus amauronius westerlundianus Lindholm, 1909^[2]
• Choanomphalus annuliformis Kozhov, 1936^[2]
• Choanomphalus anomphalus W. Dybowski, 1901^[3]
• Choanomphalus aorus Bourguignat, 1860^[2]
• Choanomphalus baicalensis^{[4][unreliable source?]}
• Choanomphalus bathybius Beckman & Starobogatov, 1975^[2]
  • Choanomphalus bathybius meridianus Beckman & Starobogatov, 1975^[2]
• Choanomphalus cryptomphalus W. Dybowski, 1901^[3]
• Choanomphalus eurystomus Lindholm, 1909^[3]
• Choanomphalus gerstfeldtianus Lindholm, 1909^[2]
• Choanomphalus grachevi Sitnikova & Röpstorf, 1999^[2]
• Choanomphalus huzhirensis Beckman & Starobogatov, 1975^[2]
• Choanomphalus hyaliniiformis Moskvicheva & Dworiadkin, 1980^[2]
• Choanomphalus incertus Lindholm, 1909^[2]
  • Choanomphalus incertus mesospiralis B. Dybowski & Grochmalicki, 1925^[2]
• Choanomphalus korotnevi Lindholm, 1909^[2]
• Choanomphalus kozhovi Beckman & Starobogatov, 1975^[2]
• Choanomphalus lindholmi Beckman & Starobogatov, 1975^[3]
• Choanomphalus maacki Gerstfeldt, 1859^[3] - type species
  • Choanomphalus maacki andrussowianus (Lindholm, 1909)^[2]
  • Choanomphalus maacki elatior Lindholm, 1909^[2]
• Choanomphalus microtrochus Lindholm, 1909^[3]
• Choanomphalus mongolicus^[5]
• Choanomphalus okhoticus Prozorova & Starobogatov, 1997^[3]
• Choanomphalus omphalotus W. Dybowski, 1901^[3]
• Choanomphalus parvus Kozhov, 1936^[2]
• Choanomphalus patulaeformis Lindholm, 1909^[2]
• Choanomphalus planorbiformis Beckman & Starobogatov, 1975^[2]
• Choanomphalus pygmaeus Lindholm, 1909^[3]
• Choanomphalus schrencki or Choanomphalus schrenkii W. Dybowski, 1875^[2]
• Choanomphalus valvatoides W. Dybowski, 1875^[2]

Synonyms:

• Choanomphalus riparius (Westerlund, 1865)^[2] is a synonym of Gyraulus riparius
• Choanomphalus rossmaessleri (Auerswald in A. Schmidt, 1851)^[2] is a synonym of Gyraulus rossmaessleri