The dientudos belong to a group of the Acestrorhynchus sort, that has twelve species populating the tropical and subtropical rivers with South America . Also is it in the lagoons.

Although they are of small stature, have a reckless appearance. Its head has a snout more or less acute and provided with several caniniformes teeth, something transparent, but that are appraised easily still with the closed mouth.

It is of silver-plated color and their small grudges still exhibit relejos golden shining in conditions of very little light, which remembers the abyssal fish of the depths of the sea. The fins are almost all triangular, with colors oranges, specially the fin of great volume.

It is a great hunter. Their teeth, but that stops to tear or to chew, are used to grasp the prey and to immobilize it, and soon it is swallowed quickly. In aquariums it is possible to see by transparency the victim within the fish and its degradation after ingestion.

They are aggressive and territorial fish, but also imprisoned they are very appreciated by other pregivers like tarariras. For that reason, very they are used like bait. The fishing with light pack light field equipment.