# Anisus

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***Anisus*** is a [genus](/source/Genus) of small air-breathing [freshwater snails](/source/Freshwater_snail), [aquatic](/source/Aquatic_animal) [pulmonate](/source/Pulmonate) [gastropod](/source/Gastropod) [mollusks](/source/Mollusk) in the subfamily Planorbinae of the [family](/source/Family_(taxonomy)) [Planorbidae](/source/Planorbidae), the [ramshorn snails](/source/Ramshorn_snail) and their allies.[2]

## Species

The genus contains the following species:[2]

**Extant**

- *[Anisus bachlongviensus](/source/Anisus_bachlongviensus)* Saurin, 1960
- *[Anisus centrogyratus](/source/Anisus_centrogyratus)* (Westerlund, 1875)
- *[Anisus leucostoma](/source/Anisus_leucostoma)* (Millet, 1813)
- *[Anisus pauxillus](/source/Anisus_pauxillus)* van Benthem Jutting, 1963
- *[Anisus ressmanianus](/source/Anisus_ressmanianus)* (Westerlund, 1875)
- *[Anisus sarasinorum](/source/Anisus_sarasinorum)* (Bollinger, 1914)
- *[Anisus septemgyratus](/source/Anisus_septemgyratus)* (Rossmässler, 1835)
- *[Anisus spirorbis](/source/Anisus_spirorbis)* (Linnaeus, 1758) - the [type species](/source/Type_species) of the genus[3]
- *[Anisus strauchianus](/source/Anisus_strauchianus)* (Clessin, 1884)[3]
- *[Anisus vortex](/source/Anisus_vortex)* (Linnaeus, 1758)[3]
- *[Anisus vorticulus](/source/Anisus_vorticulus)* (Troschel, 1834)[3]

**Extinct**

- † *[Anisus altaicus](/source/Anisus_altaicus)* Popova & Starobogatov, 1970
- † *[Anisus angulatus](/source/Anisus_angulatus)* (Clessin, 1877)
- † *[Anisus arltungae](/source/Anisus_arltungae)* McMichael, 1968
- † *[Anisus balizacensis](/source/Anisus_balizacensis)* (Peyrot, 1932)
- † *[Anisus bicarinatus](/source/Anisus_bicarinatus)* Szőts, 1953
- † *[Anisus brunnensis](/source/Anisus_brunnensis)* (Sauerzopf, 1953)
- † *[Anisus coislinensis](/source/Anisus_coislinensis)* (Sauerzopf, 1953)
- † *[Anisus confusus](/source/Anisus_confusus)* Soós, 1934
- † *[Anisus densecostatus](/source/Anisus_densecostatus)* Schütt, 1994
- † *[Anisus deviatkini](/source/Anisus_deviatkini)* Popova & Starobogatov, 1970
- † *[Anisus dupuyianus](/source/Anisus_dupuyianus)* (Noulet, 1854)
- † *[Anisus falsani](/source/Anisus_falsani)* (Locard, 1883)
- † *[Anisus guerichi](/source/Anisus_guerichi)* (Andreae, 1902)
- † *[Anisus gulmargensis](/source/Anisus_gulmargensis)* Bhatia, 1975
- † *[Anisus hilgendorfi](/source/Anisus_hilgendorfi) (*Fraas, 1868)
- † *[Anisus karkaraensis](/source/Anisus_karkaraensis)* (Schlosser, 1906)
- † *[Anisus komarovae](/source/Anisus_komarovae)* Prysjazhnjuk, 1974
- † *[Anisus krambergeri](/source/Anisus_krambergeri)* (Halaváts, 1903)
- † *[Anisus laskarevi](/source/Anisus_laskarevi)* Milošević, 1976
- † *[Anisus lentiformis](/source/Anisus_lentiformis)* Popova & Starobogatov, 1970
- † *[Anisus lungershauseni](/source/Anisus_lungershauseni)* Popva & Starobogatov, 1970
- † *[Anisus mariae](/source/Anisus_mariae)* (Michaud, 1862)
- † *[Anisus metochiensis](/source/Anisus_metochiensis)* Milošević, 1976
- † *[Anisus nechoroshevi](/source/Anisus_nechoroshevi)* Popova & Starobogatov, 1970

- † *[Anisus omalus](/source/Anisus_omalus)* (Bourguignat, 1881)
- † *[Anisus paritus](/source/Anisus_paritus)* Y.-T. Li, 1986
- † *[Anisus pseudoplanulatus](/source/Anisus_pseudoplanulatus)* Szőts, 1953
- † *[Anisus pseudosubangulatus](/source/Anisus_pseudosubangulatus)* Szőts, 1953
- † *[Anisus racovetzae](/source/Anisus_racovetzae)* Popova & Starobogatov, 1970
- † *[Anisus ressmanianus](/source/Anisus_ressmanianus)* (Westerlund, 1875)
- † *[Anisus rousianus](/source/Anisus_rousianus)* (Noulet, 1854)
- † *[Anisus saddaritanus](/source/Anisus_saddaritanus)* (Pallary, 1901)
- † *[Anisus septemgyratiformis](/source/Anisus_septemgyratiformis)* (Gottschick, 1911)
- † *[Anisus subanguloides](/source/Anisus_subanguloides)* H.-J. Wang, 1982
- † *[Anisus thomasi](/source/Anisus_thomasi)* (Pallary, 1901)
- † *[Anisus trapeziiformis](/source/Anisus_trapeziiformis)* Popova & Starobogatov, 1970
- † *[Anisus tuerykensis](/source/Anisus_tuerykensis)* Popova & Starobogatov, 1970
- † *[Anisus vorticoides](/source/Anisus_vorticoides)* (Martinson, 1954)
- † *[Anisus weizhouensis](/source/Anisus_weizhouensis)* H.-J. Wang, 1982

**Uncertain (Taxon Inqurendum)**

- *[Anisus dietmari](/source/Anisus_dietmari)* Schütt, 1973
- *[Anisus issykulensis](/source/Anisus_issykulensis)* (Clessin, 1907)
- *[Anisus calculiformis](/source/Anisus_calculiformis)* (Sandberger, 1874)

**Subspecies and species brought into synonymy (Selection)**

- Subgenus *Anisus (Gyraulus)* Agassiz in Charpentier, 1837: synonym of *[Gyraulus](/source/Gyraulus)* Charpentier, 1837
- *Anisus (Gyraulus) terekholicus* Prozorova & Starobogato, 1997: synonym of *[Gyraulus terekholicus](/source/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](/source/Anisus_dupuyianus)* (Noulet, 1854)
- *Anisus septemgyratus* auct. (not Rossmässler):[3] synonym of *[Anisus calculiformis](/source/Anisus_calculiformis)* (Sandberger, 1874)
- *Anisus tokyoensis* Mori, 1938: synonym of *[Gyraulus tokyoensis](/source/Gyraulus_tokyoensis)* (Mori, 1938)

## References

1. (in German) Studer S. (1820). "Kurzes Verzeichniss der bis jetzt in unserm Vaterlande entdeckten Conchylien". *[Naturwissenschaftlicher Anzeiger der Allgemeinen Schweizerischen Gesellschaft für die Gesammten Naturwissenschaften](/source/Naturwissenschaftlicher_Anzeiger_der_Allgemeinen_Schweizerischen_Gesellschaft_f%C3%BCr_die_Gesammten_Naturwissenschaften)* **3**(11): 83-90, 91-94. Bern.

1. Neubert, Eike (2020). "Anisus S. Studer, 1820". 716342. Retrieved 7 August 2025.

1. Glöer, P. 2002 *Die Süßwassergastropoden Nord- und Mitteleuropas*. Die Tierwelt Deutschlands, ConchBooks, Hackenheim, 326 pp., ISBN 3-925919-60-0, page 254-263.

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