Doryssa
Doryssa is a genus of freshwater snails which have an operculum, aquatic gastropod mollusks in the family Pachychilidae.
Distribution
These freshwater snails are endemic to South America.Species
Species within the genus Doryssa include:Doryssa atra Doryssa brevior - type species of the genus DoryssaDoryssa consolidata Doryssa derivans Brot, 1874Doryssa geijskesi Doryssa gruneri Doryssa hohenackeri Doryssa kappleri Doryssa lamarckiana Doryssa petechialis Doryssa schuppi- ''Doryssa transversa''