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Hydrolycus
	Hydrolycus scomberoides
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Characiformes
Family:	Cynodontidae
Subfamily:	Cynodontinae
Genus:	Hydrolycus; (J. P. Müller & Troschel, 1844)
Type species
	Salmo scomberoides; Cuvier, 1819

Hydrolycus is a genus of large dogtooth characins from tropical South America, where found in the Amazon and Orinoco basins, as well as rivers of the Guianas.^[1] The genus includes the largest dogtooth characins, reaching up to 1.17 m (3.8 ft) in length.^[1] They have long, pointed teeth (shorter and less extreme in H. wallacei) used for spearing their prey, generally smaller fish.^[2] In a study of the stomachs of 45 individuals, most were empty, but among the remaining the prey fish were 15–50% of the length Hydrolycus itself.^[3]

In 1999 two new species were described, the first in this genus in 158 years.^[1]^[2]

Species

There are currently four described species.^[1]

Hydrolycus armatus (Jardine, 1841) (Payara)
Hydrolycus scomberoides (G. Cuvier, 1819) (Payara)
Hydrolycus tatauaia Toledo-Piza, Menezes & dos Santos, 1999
Hydrolycus wallacei Toledo-Piza, Menezes & dos Santos, 1999

References

^ ^a ^b ^c ^d Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Hydrolycus". FishBase. January 2017 version.
^ ^a ^b Toledo-Piza, M.; N.A. Menezes; G.M. Santos (1999). "Revision of the Neotropical fish genus Hydrolycus (Ostariophysi: Characiformes: Cynodontidae) with the description of two new species". Ichthyol. Explor. Freshwaters. 10 (3): 255–280.
^ Goulding, M (1980). The Fishes and the Forest: Explorations in Amazonian Natural History. University of California Press. pp. 185–186. ISBN 0-520-04131-3.