''Solenaia'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of freshwater mussels in the family

Unionidae The Unionidae are a Family (biology), family of freshwater mussels, the largest in the order Unionida, the bivalve molluscs sometimes known as river mussels, or simply as unionids. The range of distribution for this family is world-wide. It is a ...

. They have a very elongated shell that lacks dentition.

Species

There is only one recognized

extant Extant or Least-concern species, least concern is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Exta ...

species: * '' Solenaia emarginata'' (Lea, 1860) There is also one species only known from the fossil record: * †'' Solenaia cordierii'' (C. H. d'Orbigny, 1837) Many other species have been recognized before. Chinese literature sources have records of at least five different species. However, recent taxonomic work has moved most former ''Solenaia'' species to other genera, including '' Sinosolenaia'', '' Parvasolenaia'', and '' Koreosolenaia''.

Distribution

The only extant species, '' Solenaia emarginata'' (synonym: ''Solenaia khwaenoiensis'') is found in

Thailand Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...

Chao Phraya The Chao Phraya River is the major river in Thailand, with its low alluvial plain forming the centre of the country. It flows through Bangkok and then into the Gulf of Thailand. Etymology Written evidence of the river being referred to by the ...

and

Mae Klong The Mae Klong (, , ), sometimes spelled Meklong, is a river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, o ...

drainages.

References

Unionidae Bivalve genera Bivalves of Asia Endemic fauna of Thailand Taxa named by Timothy Abbott Conrad {{Unionidae-stub