Cynodon Hydrolycus Rhaphiodon Cynodontinae is a subfamily of tropical and subtropical South American fishes of the family Cynodontidae.

They are characterized by an oblique mouth and very long distinct canines, which are used to capture and stab their prey, other fish that can be up to half the length of the cynodontine itself.

[2] Cynodontinae species are found throughout the Orinoco and Amazon basins, as well as the rivers of the Guianas.

[2] These fish live in mid- to surface-water levels in rivers, flooded forests, and lakes.

[2] Cynodontines are distinguished by their oblique mouth and highly developed pair of dentary canine teeth.