Planorbis


Planorbis is a genus of air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails, or planorbids. All species in this genus have sinistral or left-coiling shells.

Description

Planorbis shells are flat-coiled and sinistral.

Distribution

This genus has a worldwide distribution. It is known from the Jurassic to the Recent periods.

Species

Species within the genus Planorbis include:
;Subgenus Planorbis Prysjazhnjuk & Kovalenko, 1986
; Subgenus Planorbis Müller, 1773
;Subgenus ?
;Suggenera and species brought into synonymy :