''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". 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 ...

References

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