Choanomphalus maacki

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)
 * 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. The height of the shell is 2.5–3.0 mm.