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.

Species
Species within the genus Choanomphalus include:
 * Choanomphalus amauronius Bourguignat, 1860
 * Choanomphalus amauronius angulatus (B. Dybowski & Grochmalicki, 1925)
 * Choanomphalus amauronius westerlundianus Lindholm, 1909
 * Choanomphalus annuliformis Kozhov, 1936
 * Choanomphalus anomphalus W. Dybowski, 1901
 * Choanomphalus aorus Bourguignat, 1860
 * Choanomphalus baicalensis
 * Choanomphalus bathybius Beckman & Starobogatov, 1975
 * Choanomphalus bathybius meridianus Beckman & Starobogatov, 1975
 * Choanomphalus cryptomphalus W. Dybowski, 1901
 * Choanomphalus eurystomus Lindholm, 1909
 * Choanomphalus gerstfeldtianus Lindholm, 1909
 * Choanomphalus grachevi Sitnikova & Röpstorf, 1999
 * Choanomphalus huzhirensis Beckman & Starobogatov, 1975
 * Choanomphalus hyaliniiformis Moskvicheva & Dworiadkin, 1980
 * Choanomphalus incertus Lindholm, 1909
 * Choanomphalus incertus mesospiralis B. Dybowski & Grochmalicki, 1925
 * Choanomphalus korotnevi Lindholm, 1909
 * Choanomphalus kozhovi Beckman & Starobogatov, 1975
 * Choanomphalus lindholmi Beckman & Starobogatov, 1975
 * Choanomphalus maacki Gerstfeldt, 1859 - type species
 * Choanomphalus maacki andrussowianus (Lindholm, 1909)
 * Choanomphalus maacki elatior Lindholm, 1909
 * Choanomphalus microtrochus Lindholm, 1909
 * Choanomphalus mongolicus
 * Choanomphalus okhoticus Prozorova & Starobogatov, 1997
 * Choanomphalus omphalotus W. Dybowski, 1901
 * Choanomphalus parvus Kozhov, 1936
 * Choanomphalus patulaeformis Lindholm, 1909
 * Choanomphalus planorbiformis Beckman & Starobogatov, 1975
 * Choanomphalus pygmaeus Lindholm, 1909
 * Choanomphalus schrencki or Choanomphalus schrenkii W. Dybowski, 1875
 * Choanomphalus valvatoides W. Dybowski, 1875

Synonyms:
 * Choanomphalus riparius (Westerlund, 1865) is a synonym of Gyraulus riparius
 * Choanomphalus rossmaessleri (Auerswald in A. Schmidt, 1851) is a synonym of Gyraulus rossmaessleri