Hemiodus

Hemiodus
Temporal range: Middle Miocene–present
Hemiodus quadrimaculatus
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Division: Teleostei
Order: Characiformes
Family: Hemiodontidae
Genus: Hemiodus
J. P. Müller, 1842
Type species
Hemiodus crenidens
Müller, 1842
Synonyms
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 elongate fish reach a length of 7–30 cm (3–12 in).

Fossil remains are known from the Middle Miocene-aged Pebas Formation of Peru.

Species

Hemiodus has the following species classified within it:

References

  1. 1 2 Fricke, Ron; Eschmeyer, William N. & van der Laan, Richard (eds.). "Genera in the family Hemiodontidae". Catalog of Fishes. California Academy of Sciences. Retrieved 22 July 2025.
  2. ↑ 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.
  3. ↑ 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.
  4. ↑ Fricke, Ron; Eschmeyer, William N. & van der Laan, Richard (eds.). "Species in the genus Hemiodus". Catalog of Fishes. California Academy of Sciences. Retrieved 22 July 2025.