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, 1901IUCN (2013). IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 16 May 2014. Choanomphalus aorus Bourguignat, 1860 Choanomphalus baicalensisChoanomphalus baicalensis. NCBI. 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 mongolicusSitnikova T. Ya. (1999). "Variability of the gastropod mollusk Choanomphalus mongolicus shell from Lake Hovsgol". Russian Journal of Zoology 78(7): 413-4??. abstract 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
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