(J. P. Müller & Troschel, 1844)
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. They have long, pointed teeth used for spearing their prey, generally smaller fish. The genus includes the largest dogtooth characins, reaching up to 1.17 m (3.8 ft) in length.
- 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
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