''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the

Amazon Basin The Amazon basin is the part of South America drained by the Amazon River and its tributaries. The Amazon drainage basin covers an area of about , or about 35.5 percent of the South American continent. It is located in the countries of Bolivi ...

, but also found in the

Orinoco The Orinoco () is one of the longest rivers in South America at . Its drainage basin, sometimes known as the Orinoquia, covers , with 76.3 percent of it in Venezuela and the remainder in Colombia. It is the fourth largest river in the wor ...

Essequibo Essequibo is the largest traditional region of Guyana but not an administrative region of Guyana today. It may also refer to: * Essequibo River, the largest river in Guyana * Essequibo (colony), a former Dutch colony in what is now Guyana; * Esseq ...

, Paraná– Paraguay and Parnaíba River basins. Depending on the species involved, these elongate fish reach a length of .

Species

There are currently 21 recognized species in this genus: * ''

Hemiodus amazonum ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these e ...

'' (

Humboldt Humboldt may refer to: People * Alexander von Humboldt, German natural scientist, brother of Wilhelm von Humboldt * Wilhelm von Humboldt, German linguist, philosopher, and diplomat, brother of Alexander von Humboldt Fictional characters * ...

, 1821) * ''

Hemiodus argenteus ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these e ...

'' Pellegrin, 1909 * ''

Hemiodus atranalis ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these e ...

'' ( Fowler, 1940) * ''

Hemiodus goeldii ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these e ...

Steindachner Franz Steindachner (11 November 1834 in Vienna – 10 December 1919 in Vienna) was an Austrian zoologist, ichthyologist, and herpetologist. He published over 200 papers on fishes and over 50 papers on reptiles and amphibians. Steindachner describ ...

, 1908 * ''

Hemiodus gracilis ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these e ...

'' Günther, 1864 * ''

Hemiodus huraulti ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these e ...

'' ( Géry, 1964) * ''

Hemiodus immaculatus ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these e ...

'' Kner, 1858 * ''

Hemiodus iratapuru ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these e ...

'' Langeani & C. L. R. Moreira, 2013 Langeani, F. & Moreira, C.R. (2013): ''Hemiodus iratapuru'', a new species of Hemiodontidae from the Rio Jari, Amazon Basin, Brazil (Teleostei, Characiformes). ''Journal of Fish Biology, 82 (4): 1259–1268.'' * ''

Hemiodus jatuarana ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these ...

'' Langeani, 2004 * ''

Hemiodus langeanii ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná– Paraguay and Parnaíba River basins. Depending on the species involved, th ...

'' Beltrão & Zuanon, 2012Beltrão, H. & Zuanon, J. (2012)
Hemiodus langeanii (Characiformes: Hemiodontidae), a new species from rio Amana, rio Maués-Açú drainage, Amazon basin, Brazil.
''Neotropical Ichthyology, 10 (2): 255-262.'' * '' Hemiodus microlepis'' Kner, 1858 * '' Hemiodus orthonops'' C. H. Eigenmann & C. H. Kennedy, 1903 * '' Hemiodus parnaguae'' C. H. Eigenmann & Henn, 1916 * ''

Hemiodus quadrimaculatus ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná– Paraguay and Parnaíba River basins. Depending on the species involved, th ...

'' Pellegrin, 1909 (Barred hemiodus) * '' Hemiodus semitaeniatus'' Kner, 1858 (Halfline hemiodus) * '' Hemiodus sterni'' ( Géry, 1964) * '' Hemiodus ternetzi'' G. S. Myers, 1927 * '' Hemiodus thayeria'' J. E. Böhlke, 1955 * ''

Hemiodus tocantinensis ''Hemiodus'' is a genus of halftooths from South America with the greatest species richness in the Amazon Basin, but also found in the Orinoco, Essequibo, Paraná–Paraguay and Parnaíba River basins. Depending on the species involved, these ...

'' Langeani, 1999 * '' Hemiodus unimaculatus'' (

Bloch Bloch is a surname of German origin. Notable people with this surname include: A–F * (1859-1914), French rabbi *Adele Bloch-Bauer (1881-1925), Austrian entrepreneur *Albert Bloch (1882–1961), American painter * (born 1972), German motor journal ...

, 1794) * '' Hemiodus vorderwinkleri'' ( Géry, 1964)

References

Hemiodontidae Characiformes genera Taxa named by Johannes Peter Müller Fish of South America {{Characiformes-stub