Cynodontidae


Cynodontidae, also known as dogtooth characins or vampire tetras, are a family of predatory, characiform freshwater fishes from South America. This group is not very diverse, and includes only five genera and 14 species. Most of what is known about this family is from the members of the subfamily Cynodontinae, which includes the largest species of this family, up to. The members of subfamily Roestinae are less known, though they only reach up to.

Physical characteristics

Cynodontidae are elongated in shape with a silvery or grey colour and an upturned mouth. Some species have a hunchbacked appearance. The family names derive from the long and well-developed canines which are used to spear their prey, mainly other fish. Their pectoral fins are also expanded. The maximum length reached is.

Distribution and habitat

These fish live in midlevel to surface waters of rivers, lakes, and flooded forests. Most species of this family originate from the Orinoco and Amazon basins, as well as rivers of the Guianas. One species, Rhaphiodon vulpinus, ranges as far south as the Paraná-Paraguay and Uruguay basins, and Gilbertolus is found in the Atrato, Magdalena and Maracaibo basins. Fossil species are also known from Argentina.

Relationship to humans

Hydrolycus species are game fish, having been recently added to the International Game Fish Association in the fly and rod class. Cynodontid fish are also sometimes kept in aquaria.