Planorbis 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.
Planorbis shells are flat-coiled and sinistral.
This genus has a worldwide distribution. It is known from the Jurassic to the Recent periods.
Species within the genus Planorbis include:
Subgenus Planorbis (Jalpuchorbis) Prysjazhnjuk & Kovalenko, 1986 † Planorbis bolgradensis Prysjazhnjuk & Kovalenko, 1986 † Planorbis roshkai Prysjazhnjuk & Kovalenko, 1986 Subgenus Planorbis (Planorbis) Müller, 1773 Planorbis corinna Gray, 1850Planorbis carinatus O. F. Müller, 1774Planorbis moquini Requien, 1848Planorbis planorbis (Linnaeus, 1758)Planorbis kahuica Finlay & Laws, 1931Subgenus ? † Planorbis anceps Sacco, 1884 † Planorbis austroalpinus Harzhauser & Neubauer in Harzhauser et al., 2012 † Planorbis bouei Pavlović, 1932 † Planorbis fischeri Wenz, 1919 † Planorbis gladilini Pavlović, 1931 Planorbis intermixtus Mousson, 1874† Planorbis kochi Pavlović, 1927 † Planorbis nisseanus Pavlović, 1931 † Planorbis petrovici Pavlović, 1931 † Planorbis striatus Serres, 1853 † Planorbis truncatocarinatus Pavlović, 1931 † Planorbis verticilloides Pavlović, 1931 † Planorbis zivkovici Pavlović, 1931 Suggenera and species brought into synonymy Subgenus Planorbis (Anisus ) Studer, 1820: synonym of Anisus Subgenus Planorbis (Armiger) Hartmann, 1843 : synonym of Gyraulus (Armiger)Gyraulus Subgenus Planorbis (Bathyomphalus) Charpentier, 1837: synonym of Bathyomphalus Charpentier, 1837 Subgenus Planorbis (Coretus) Gray, 1847: synonym of Planorbarius Subgenus Planorbis (Gyraulus) Agassiz in Charpentier, 1837: synonym of Gyraulus Charpentier, 1837 † Planorbis (Gyraulus) declivis var. balizacensis Peyrot, 1932: synonym of † Anisus balizacensis (Peyrot, 1932) Subgenus Planorbis (Gyrorbis) Fitzinger, 1833: synonym of Valvata Subgenus Planorbis (Odontogyrorbis) Lörenthey, 1906: synonym of Anisus (Anisus) Studer, 1820 Subgenus Planorbis (Segmentina ) Fleming, 1818: synonym of Segmentina Fleming, 1818 Planorbis acronicus Férussac, 1807: synonym of Gyraulus acronicus Planorbis albus O. F. Müller, 1774: synonym of Gyraulus albus Planorbis argaeicus Sturany, 1904: synonym of Gyraulus argaeicus Planorbis atkinsoni Johnston, 1879: synonym of Gyraulus atkinsoni (Johnston, 1879)Planorbis biwaensis Preston, 1916: synonym of Gyraulus biwaensis (Preston, 1916)Planorbis borealis Westerlund, 1875: synonym of Gyraulus acronicus Planorbis campanulatus Say, 1821 accepted as Planorbella campanulata (Say, 1821)Planorbis chinensis Dunker, 1848: synonym of Gyraulus chinensis Planorbis contrarius O. F. Müller, 1774: synonym of Marisa cornuarietis Planorbis convexiusculus Hutton, 1849: synonym of Gyraulus convexiusculus (Hutton, 1849)Planorbis costulatus Krauss, 1848: synonym of Gyraulus costulatus Planorbis crosseanus Bourguignat, 1862: synonym of Gyraulus albus Planorbis ehrenbergi Beck, 1837: synonym of Gyraulus ehrenbergi (Beck, 1837)Planorbis essingtonensis E. A. Smith, 1882: synonym of Gyraulus essingtonensis (E. A. Smith, 1882)Planorbis fragilis Tate, 1896: synonym of Gyraulus essingtonensis (E. A. Smith, 1882)Planorbis gredleri Gredler, 1859: synonym of Gyraulus acronicus (Férussac, 1807)Planorbis hebraicus Bourguignat, 1852: synonym of Gyraulus hebraicus (Bourguignat, 1852)Planorbis hispidus Draparnaud, 1805: synonym of Gyraulus albus (O. F. Müller, 1774)Planorbis imbricatus O. F. Müller, 1774: synonym of Gyraulus crista Gyraulus (Armiger) crista (Linnaeus, 1758)Planorbis laevis Alder, 1838: synonym of Gyraulus laevis Planorbis leucostoma Millet, 1813: synonym of Anisus (Anisus) leucostoma (Millet, 1813)Planorbis natalensis Krauss, 1848: synonym of Afrogyrorbis natalensis (Krauss, 1848)Planorbis paladilhi Moitessier, 1867: synonym of Gyraulus crista Gyraulus (Armiger) crista (Linnaeus, 1758)Planorbis parvus Say, 1817: synonym of Gyraulus parvus Planorbis persicus Ancey, 1900: synonym of Planorbis intermixtus Mousson, 1874Planorbis piscinarum Bourguignat, 1852: synonym of Gyraulus piscinarum (Bourguignat, 1852)Planorbis riparius Westerlund, 1865: synonym of Gyraulus riparius Planorbis rossmaessleri Auerswald, 1851: synonym of Gyraulus rossmaessleri Planorbis rotula Benson, 1850: synonym of Gyraulus rotula (Benson, 1850)Planorbis sivalensis Clessin, 1884: synonym of Gyraulus sivalensis (Clessin, 1884)Planorbis spirillus Gould, 1859: synonym of Gyraulus spirillus (Gould, 1859)Planorbis spirorbis (Linnaeus, 1758): synonym of Anisus (Anisus) spirorbis (Linnaeus, 1758)Planorbis thermalis Westerlund, 1885: synonym of Gyraulus laevis Planorbis umbilicatus (Müller, 1773): synonym of Planorbis (Planorbis) planorbis (Linnaeus, 1758)Planorbis waterhousei Clessin, 1885: synonym of Gyraulus waterhousei (Clessin, 1885)
