Bithynia is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of small freshwater snail

Freshwater snail

A freshwater snail is one kind of freshwater mollusc, the other kind being freshwater clams and mussels, i.e. freshwater bivalves. Specifically a freshwater snail is a gastropod that lives in a watery non-marine habitat. The majority of freshwater gastropods have a shell, with very few exceptions....

s with an operculum, aquatic prosobranch gastropod mollusks in the family Bithyniidae

Bithyniidae

Bithyniidae is a family of small freshwater snails with an operculum, aquatic gastropod molluscs in the clade Littorinimorpha.Their minute shell is often colored. They are characterized by a calcareous operculum, a lobe on the upper surface of the neck. The ctenidium, the respiratory gill-comb, is...

.

The diploid chromosome number of Bithynia sp. from Egypt is 2n=32.

Species

Subgenera and species within the genus Bithynia include:

Subgenus Bithynia Leach, 1818

• Bithynia tentaculata
  Bithynia tentaculata
  Bithynia tentaculata, common names the mud bithynia or common bithynia, or faucet snail is a relatively small species of freshwater snail with gills and an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae....
  
  (Linnaeus, 1758) - Common (or mud) bithynia - type species
  Type species
  In biological nomenclature, a type species is both a concept and a practical system which is used in the classification and nomenclature of animals and plants. The value of a "type species" lies in the fact that it makes clear what is meant by a particular genus name. A type species is the species...
  
  

Subgenus Codiella Locard, 1894

• Bithynia leachii
  Bithynia leachii
  Bithynia leachii is species of small freshwater snail with an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae.-Shell description:The shell of the species grows to be 6.5 mm in maximum dimension....
  
  (Sheppard, 1823)
• Bithynia troschelii
  Bithynia troschelii
  Bithynia troschelii is species of small freshwater snail, an aquatic prosobranch gastropod mollusk in the family Bithyniidae.Its specific epithet is in honor of German zoologist Franz Hermann Troschel.-Taxonomy:...
  
  (Paasch 1842)

Subgenus Neumayria De Stefani, 1887

• Bithynia bavelensis Meijer, 1990

Subgenus Digoniostoma

• Bithynia siamensis
  Bithynia siamensis
  Bithynia siamensis is a species of a freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae.- Subspecies :* Bithynia siamensis siamensis - synonym: Bithynia siamensis goniomphalus...
  
  - in Thailand

Subgenus Incertae sedis

• Bithynia badiella (Küster, 1852)
• Bithynia pentheri Sturany, 1905
• Bithynia phialensis (Conrad, 1852)
• Bithynia pseudemmericia Schütt, 1964

Subgenus ?

• Bithynia boissieri (Küster, 1852)
• Bithynia candiota Westerlund, 1885
• Bithynia canyamelensis
  Bithynia canyamelensis
  Bithynia canyamelensis is a species of small freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae....
  
  Altaba, 2007
• Bithynia fuchsiana - in China
• Bithynia graeca Westerlund, 1879
• Bithynia italica (Paulucci, 1880)
• Bithynia kobialkai Glöer & Beckmann, 2007
• Bithynia longicornis - in China
• Bithynia majorcina
  Bithynia majorcina
  Bithynia majorcina is a species of small freshwater snail with an operculum, an aquatic gastropod mollusk in the family Bithyniidae.-Description:...
  
  Glöer & Rolán, 2007
• Bithynia manonellesi
  Bithynia manonellesi
  Bithynia manonellesi is a species of small freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae....
  
  Altaba, 2007
• Bithynia mostarensis Moellendorff, 1873
• Bithynia nakeae Glöer & Beckmann, 2007
• Bithynia pauli
  Bithynia pauli
  Bithynia pauli is a species of small freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae....
  
  Altaba, 2007
• Bithynia quintanai Glöer & Beckmann, 2007
• Bithynia radomani Glöer & Pešić, 2007
• Bithynia riddifordi
  Bithynia riddifordi
  Bithynia riddifordi is a species of small freshwater snail with a gill and an operculum, an aquatic prosobranch gastropod mollusk in the family Bithyniidae....
  
  Altaba, 2007
• Bithynia schwabii Frauenfeld, 1865
• Bithynia skadarskii Glöer & Pešić, 2007
• Bithynia walderdorffii Frauenfeld, 1865
• Bithynia zeta Glöer & Pešić, 2007

Further reading

• Glöer P. & Pešić V. (2007). "The Bithynia species from Skadar Lake (Montenegro) (Gastropoda: Bithyniidae)". Mollusca 25(1): 7-12. Dresden.