title: Choanomphalus amauronius
text: # Choanomphalus amauronius
  
  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)
  * Choanomphalus amauronius westerlundianus Lindholm, 1909 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.
  
  | Apical view of the shell. | Umbilical view of the shell. |
  | - | - |
  