Hemiodus
| Hemiodus Temporal range:
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|---|---|
| |
| Hemiodus quadrimaculatus | |
Scientific classification 
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Characiformes |
| Family: | Hemiodontidae |
| Genus: | J. P. Müller, 1842[1] |
| Type species | |
| Hemiodus crenidens Müller, 1842
| |
| Synonyms[1] | |
| |
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 elongate fish reach a length of 7–30 cm (3–12 in).[2]
Fossil remains are known from the Middle Miocene-aged Pebas Formation of Peru.[3]
Species
Hemiodus has the following species classified within it:[4]
- Hemiodus amazonum (Humboldt, 1821)
- Hemiodus argenteus Pellegrin, 1909
- Hemiodus atranalis (Fowler, 1940)
- Hemiodus bimaculatus Nogueira, Langeani & Netto‐Ferreira, 2019
- Hemiodus goeldii Steindachner, 1908
- Hemiodus gracilis Günther, 1864
- Hemiodus huraulti (Géry, 1964)
- Hemiodus immaculatus Kner, 1858
- Hemiodus iratapuru Langeani & C. L. R. Moreira, 2013
- Hemiodus jatuarana Langeani, 2004
- Hemiodus langeanii Beltrão & Zuanon, 2012
- Hemiodus microlepis Kner, 1858
- Hemiodus ocellatus (Vari, 1982)
- Hemiodus orthonops C. H. Eigenmann & C. H. Kennedy, 1903
- Hemiodus parnaguae C. H. Eigenmann & Henn, 1916
- Hemiodus quadrimaculatus 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 Langeani, 1999
- Hemiodus tucupi Silva, Nogueira, Netto-Ferreira, Akama & Dutra, 2020
- Hemiodus unimaculatus (Bloch, 1794)
- Hemiodus vorderwinkleri (Géry, 1964)
References
- ^ a b Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Genera in the family Hemiodontidae". Catalog of Fishes. California Academy of Sciences. Retrieved 22 July 2025.
- ^ Beltrão, 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. doi:10.1590/S1679-62252012000200004.
- ^ Carrillo-Briceño, Jorge D.; Aguilera, Orangel A.; Benites-Palomino, Aldo; Hsiou, Annie S.; Birindelli, José L. O.; Adnet, Sylvain; Cadena, Edwin-Alberto; Scheyer, Torsten M. (2021-12-20). "A historical vertebrate collection from the Middle Miocene of the Peruvian Amazon". Swiss Journal of Palaeontology. 140 (1): 26. Bibcode:2021SwJP..140...26C. doi:10.1186/s13358-021-00239-7. ISSN 1664-2384.
- ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Hemiodus". Catalog of Fishes. California Academy of Sciences. Retrieved 22 July 2025.