Choanomphalus amauronius is a species of freshwater air-breathing snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids.
Subspecies Choanomphalus amauronius amauronius Bourguignat, 1860 Choanomphalus amauronius angulatus (B. Dybowski & Grochmalicki, 1925) Dybowski B. & Grochmalicki J. (1925). "Przyczynki doo znajomości mięczaków jeziora Bajkalskiego. (Contributions à la connaissance des Mollusques du lac Baical)". Wladislaviidae nom. fam. Kosmos (Lwow), 50: 819–881. page 878, figs. 29–31. Choanomphalus amauronius westerlundianus 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 20–21, plate 2, fig. 1, 3. The subspecific name westerlundianus is in honor of Swedish malacologist Carl Agardh Westerlund.
Distribution This species is found in Lake Baikal, Russia and in Angara River.
Description The width of the shell is 5–6 mm. The height of the shell is 4 mm.
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