''Acheilognathus deignani'' is a species of freshwater

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fishes, is a class of bony fish. They comprise over 50% of living vertebrate species. The ray-finned fishes are so called because their fins are webs of skin supported by bony or hor ...

in the genus ''

Acheilognathus ''Acheilognathus'' is a genus of cyprinid fish native to Asia. The name is derived from the Greek ''a'', meaning "without", the Greek ''cheilos'', meaning "lip", and the Greek ''gnathos'', meaning "jaw". Morphology Fishes of this genus have l ...

''. It is endemic to northern

Vietnam Vietnam or Viet Nam ( vi, Việt Nam, ), officially the Socialist Republic of Vietnam,., group="n" is a country in Southeast Asia, at the eastern edge of mainland Southeast Asia, with an area of and population of 96 million, making i ...

in the

Mekong River The Mekong or Mekong River is a trans-boundary river in East Asia and Southeast Asia. It is the world's twelfth longest river and the third longest in Asia. Its estimated length is , and it drains an area of , discharging of water annuall ...

. It grows to a maximum length of 5.2 cm. Named in honor of

Herbert Girton Deignan Herbert Girton Deignan (December 5, 1906 – March 15, 1968) was an American ornithologist who worked extensively on the birds of Thailand. Deignan was born in New Jersey, the son of Harry Francis and Anna Galena. He grew up in Pennsylvania and ...

(1906-1968), Associate Curator of Birds, U.S. National Museum, who collected the type specimen.

References

Acheilognathus Taxa named by Hugh McCormick Smith Fish described in 1945 Fish of Vietnam {{Acheilognathinae-stub Endemic fauna of Vietnam