Anisus

Anisus is a genus of small air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the subfamily Planorbinae of the family Planorbidae, the ramshorn snails and their allies.

Species
The genus contains the following species:
 * Subgenus Anisus
 * Anisus calculiformis (Sandberger, 1874)
 * † Anisus komarovae Prysjazhnjuk, 1974
 * † Anisus krambergeri (Halaváts, 1903)
 * † Anisus laskarevi Milošević, 1976
 * Anisus leucostoma (Millet, 1813)
 * † Anisus septemgyratiformis (Gottschick, 1911)
 * Anisus septemgyratus (Rossmässler, 1835)
 * Anisus spirorbis (Linnaeus, 1758) - the type species of the genus
 * Anisus strauchianus (Clessin, 1884)
 * Subgenus Anisus (Costorbis) Lindholm, 1926
 * † Anisus densecostatus Schütt, 1994
 * Subgenus Disculifer C. Boettger 1944
 * † Anisus omalus (Bourguignat, 1881)
 * Anisus vorticulus


 * Subgenus ?
 * † Anisus angulatus (Clessin, 1877)
 * † Anisus balizacensis (Peyrot, 1932)
 * † Anisus brunnensis (Sauerzopf, 1953)
 * † Anisus confusus Soós, 1934
 * † Anisus depressissimus (Sacco, 1886)
 * † Anisus dupuyianus (Noulet, 1854)
 * † Anisus falsani (Locard, 1883)
 * † Anisus guerichi (Andreae, 1902)
 * † Anisus hilgendorfi (Fraas, 1868)
 * Anisus issykulensis (Clessin, 1907)
 * † Anisus mariae (Michaud, 1862)
 * † Anisus matheroni (Fischer & Tournouër, 1873)
 * † Anisus metochiensis Milošević, 1976
 * Anisus natalensis (Krauss)
 * † Anisus rousianus (Noulet, 1854)
 * Anisus vortex (Linnaeus, 1758)
 * Subspecies and species brought into synonymy:
 * Subgenus Anisus (Gyraulus) Agassiz in Charpentier, 1837: synonym of Gyraulus Charpentier, 1837
 * Anisus (Gyraulus) terekholicus Prozorova & Starobogato, 1997: synonym of Gyraulus terekholicus (Prozorova & Starobogatov, 1997)
 * Subgenus † Anisus (Odontogyrorbis) Lörenthey, 1906: synonym of Anisus (Anisus) Studer, 1820
 * Subgenus Anisus (Spiralina) Martens, 1899: synonym of Anisus Studer, 1820
 * † Anisus angustigyratus (Sauerzopf, 1953): synonym of † Anisus (Anisus) krambergeri (Halaváts, 1903)
 * † Anisus dupuyanus (Noulet, 1854): synonym of † Anisus dupuyianus (Noulet, 1854)
 * Anisus septemgyratus auct. (not Rossmässler): synonym of Anisus calculiformis (Sandberger, 1874)
 * Anisus tokyoensis Mori, 1938: synonym of Gyraulus tokyoensis (Mori, 1938)