Choanomphalus maacki is a species of freshwater air-breathing snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids.
Choanomphalus maacki is the type species of the genus Choanomphalus.
Subspecies Choanomphalus maacki maacki Gerstfeldt, 1859 Choanomphalus maacki andrussowianus (Lindholm, 1909) Lindholm W. A. (1909). "Die Mollusken des Baikal-Sees (Gastropoda et Pelecypoda) systematisch und zoogeographisch bearb". Wissenschaftliche Ergebnisse einer zoologische Expedition nach dem Baikal-See unter Leitung des Prof. Alexis Korotneff i. d. J. 1900–1902, 4. Kiew und Berlin, Fridländer und Sohn: 1–104. page 10, plate 2, fig. 28–30; page 13, plate 2, fig. 25–27. Choanomphalus maacki elatior Lindholm, 1909
However, IUCN Red List 2013 lists these three as synonyms.
Distribution This species is found in Lake Baikal, Russia. Its natural habitats are freshwater lakes and river mouths.
Description The width of the shell is 5–6 mm. Bourguignat J. R. (1860). "Monographie du genre Choanomphalus". Revue et Magasin de Zoologie, série 2, 12: 527–531. plate 23. The height of the shell is 2.5–3.0 mm.
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