''Tetragonopterus'' 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 ...

fish A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Characidae Characidae, the characids, is a family of freshwater subtropical and tropical fish belonging to the order Characiformes. They are found throughout much of Central and South America, including such major waterways as the Amazon and Orinoco Riv ...

native to

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

. It is the only member of the subfamily Tetragonopterinae. The subfamily was originally much larger as previously defined, and contained many of the genera known as "

tetras Tetra is the common name of many small freshwater characiform fishes. Tetras come from Africa, Central America, and South America, belonging to the biological families Characidae, Alestidae (the "African tetras"), Lepidarchidae, Lebiasi ...

". The name "tetra" derives from this former classification.

Species

There are currently 14 recognized species of this genus: * '' Tetragonopterus anostomus'' G. S. C. Silva & Benine, 2011 Silva, G.S.C. & Benine, R.C. (2011)
A new species of ''Tetragonopterus'' Cuvier, 1816 (Characiformes, Characidae, Tetragonopterinae) from the upper rio Araguaia, Central Brazil.
''Zootaxa, 2911: 50–56.'' * '' Tetragonopterus araguaiensis'' G. S. C. Silva, B. F. Melo, C. de Oliveira & Benine, 2013 Silva, G.S.C., Melo, B.F., Oliveira, C. & Benine, R.C. (2013)
Morphological and molecular evidence for two new species of ''Tetragonopterus'' (Characiformes: Characidae) from central Brazil.
''Journal of Fish Biology, 82 (5): 1613-1631.'' * '' Tetragonopterus argenteus'' G. Cuvier, 1816 * '' Tetragonopterus carvalhoi'' B. F. Melo, Benine, Mariguela & C. de Oliveira, 2011 Melo, B.F., Benine, R.C., Mariguela, T.C. & Oliveira, C. (2011)
A new species of ''Tetragonopterus'' Cuvier, 1816 (Characiformes: Characidae: Tetragonopterinae) from the rio Jari, Amapá, northern Brazil.
''Neotropical Ichthyology, 9 (1): 49-56.'' * '' Tetragonopterus chalceus''

Agassiz Jean Louis Rodolphe Agassiz ( ; ) FRS (For) FRSE (May 28, 1807 – December 14, 1873) was a Swiss-born American biologist and geologist who is recognized as a scholar of Earth's natural history. Spending his early life in Switzerland, he recei ...

, 1829 * ''

Tetragonopterus daguae ''Tetragonopterus'' is a genus of fish in the family (biology), family Characidae native to South America. It is the only member of the subfamily Tetragonopterinae. The subfamily was originally much larger as previously defined, and contained m ...

Eigenmann Eigenmann () is a surname. Notable persons with that surname include: * Andi Eigenmann (born 1990), Filipino actress * Carl H. Eigenmann (1863–1927), German–American ichthyologist, husband of Rosa Eigenmann * Eduardo de Mesa Eigenmann, birth n ...

, 1913 * '' Tetragonopterus denticulatus'' G. S. C. Silva, B. F. Melo, C. de Oliveira & Benine, 2013 * '' Tetragonopterus franciscoensis'' G. S. C. Silva, B. F. Melo, C. de Oliveira & Benine, 2016 Silva, G.S.C., Melo, B.F., Oliveira, C. & Benine, R.C. (2016): Revision of the South American genus ''Tetragonopterus'' Cuvier, 1816 (Teleostei: Characidae) with description of four new species. ''Zootaxa, 4200 (1): 1–46.'' * '' Tetragonopterus georgiae'' (

Géry Géry () is a commune in the Meuse department in Grand Est in north-eastern France. See also *Communes of the Meuse department The following is a list of the 499 Communes of France, communes of the Meuse (department), Meuse Departments of ...

, 1965) * '' Tetragonopterus juruena'' G. S. C. Silva, B. F. Melo, C. de Oliveira & Benine, 2016 * '' Tetragonopterus kuluene'' G. S. C. Silva, B. F. Melo, C. de Oliveira & Benine, 2016 * '' Tetragonopterus manaos'' Urbanski, Melo,

Silva Silva, da Silva, and de Silva are surnames of Portuguese or Galician origin which are widespread in the Portuguese-speaking countries including Brazil. The name is derived from Latin ("forest" or "woodland"). It is the family name of the Hous ...

& Benine, 2018 Urbanski, B.Q., Melo, B.F., Silva, G.S.C. & Benine, R.C. (2018)
A new species of ''Tetragonopterus'' (Characiformes: Characidae) from Central Amazon lowlands, Brazil.
''Neotropical Ichthyology, 16 (2).'' * '' Tetragonopterus ommatus'' G. S. C. Silva, B. F. Melo, C. de Oliveira & Benine, 2016 * '' Tetragonopterus rarus'' ( Zarske,

& Isbrücker, 2004) * '' Tetragonopterus signatus''

References

Characinae Fish of South America Freshwater fish genera Taxa named by Georges Cuvier Characiformes genera {{Characidae-stub