Bithynia is a genus of small freshwater snails with an operculum, aquatic prosobranch gastropod mollusks in the family Bithyniidae.
The diploid chromosome number of Bithynia sp. from Egypt is 2n=32.
Lake Skadar with 5 species of Bithynia is a biodiversity hotspot of Bithynia evolution.
Glöer (2002) recognized four subnenera Bithynia, Codiella, Neumayria and Parafossarulus within European species. He reassigned two European extinct species of Parafossarulus into a subgenus of the genus Bithynia, but the genus Parafossarulus is generally accepted for the Asian species. The subnenus Digoniostoma is also recognized for Asian species.
Subgenera and species within the genus Bithynia include:
Subgenus Bithynia Leach, 1818
Bithynia tentaculata (Linnaeus, 1758) - Common (or mud) bithynia - type species
Subgenus Codiella Locard, 1894
Bithynia leachii (Sheppard, 1823)
Bithynia transsilvanica (Bielz, 1853) - synonym: Bithynia troschelii (Paasch 1842)
Subgenus Neumayria De Stefani, 1887
† Bithynia bavelensis Meijer, 1990
Subgenus Digoniostoma Annandale, 1920
Bithynia funiculata Walker, 1927
Bithynia siamensis Lea, 1856
Subgenus Incertae sedis
Bithynia phialensis (Conrad, 1852)
Bithynia pseudemmericia Schütt, 1964
Subgenus ?
Synonyms:
Bithynia badiella (Küster, 1852): synonym of Pseudobithynia badiella (Küster, 1853)
† Bithynia bengestensis Fontannes, 1887: synonym of † Tylopoma bengestiensis (Fontannes, 1887)
† Bithynia brusinai Halaváts, 1903: synonym of † Lithoglyphus acutus decipiens Brusina, 1885
† Bithynia crassitesta (Brömme, 1883): synonym of † Parafossarulus crassitesta (Brömme, 1883)
† Bithynia curta Locard, 1893: synonym of † Bithynia glabra helvetica (Wenz, 1930)
† Bithynia gracilis Sandberger, 1875: synonym of † Bithynia glabra glabra (von Zieten, 1832)
Bithynia hamicensis Pallary, 1939: synonym of Pseudobithynia hamicensis (Pallary, 1939)
† Bithynia labiata Neumayr in Herbich & Neumayr, 1875: synonym of † Neumayria labiata (Neumayr in Herbich & Neumayr, 1875)
Bithynia leachi (Sheppard, 1823): synonym of Bithynia leachii (Sheppard, 1823)
Bithynia majewsky Frauenfeld, 1862: synonym of Bithynia tentaculata (Linnaeus, 1758)
† Bithynia margaritula Fuchs, 1870: synonym of † Pseudamnicola (Pseudamnicola) margaritula (Fuchs, 1870)
Bithynia narentana Locard, 1874 : synonym of Bithynia mostarensis Möllendorff, 1873
Bithynia pentheri Sturany, 1904: synonym of Pseudobithynia pentheri (Sturany, 1904)
Bithynia phaeacina Locard, 1887: synonym of Pseudobithynia renei (Letourneux, 1887)
† Bithynia podwinensis Neumayr in Neumayr & Paul, 1875: synonym of † Neumayria podwinensis (Neumayr in Neumayr & Paul, 1875)
† Bithynia proxima Fuchs, 1870: synonym of † Pseudamnicola proxima (Fuchs, 1870)
Bithynia saulcyi Bourguignat, 1853: synonym of Pseudobithynia saulcyi (Bourguignat, 1853)
† Bithynia scalaris Fuchs, 1877: synonym of † Bythinella megarensis Bukowski, 1896
† Bithynia spoliata Stefanescu, 1896: synonym of † Neumayria spoliata (Stefanescu, 1896)
Bithynia stossichiana Locard, 1894: synonym of Pseudobithynia renei (Letourneux, 1887)
Bithynia uzielliana Issel, 1866: synonym of Gangetia uzielliana (Issel, 1866)
† Bithynia vucotinovici Brusina, 1874: synonym of † Neumayria vukotinovici (Brusina, 1874)
† Bithynia vukotinovici Brusina, 1874: synonym of † Neumayria vukotinovici (Brusina, 1874)
