Hemiodontidae

The Hemiodontidae are a small family of freshwater characins found in northern South America, south to the Paraná-Paraguay Basin. The larger species are popular food fish.

Hemiodontids have a streamlined body shape; many are fast-swimming, and are able to leap out of the water to escape predators. The adults of all species except Micromischodus sugillatus have no teeth on their lower jaws. Most species have a round spot on the side of the midbody and a stripe along the lower lobe of the caudal fin. The largest hemiodontids are around 50 cm in length.

Genera
The family has around 29 known species, as well as several undescribed species, in five genera:
 * Anodus
 * Argonectes
 * Bivibranchia
 * Hemiodus
 * Micromischodus