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. However, IUCN Red List 2013 lists these three as synonyms. This species is found in Lake Baikal, Russia. Its natural habitats are freshwater lakes and river mouths. The width of the shell is 5–6 mm. The height of the shell is 2.5–3.0 mm. Media related to Choanomphalus maacki at Wikimedia Commons