Epicyrtus paradoxus Hystricodon paradoxus The bucktooth tetra (Exodon paradoxus) is the only member of the genus Exodon and is a freshwater fish of the characin family (family Characidae) of order Characiformes.

This species has a typical elongated tetra appearance; it is light tan in colour with two distinct black spots (one before the tail and another below the dorsal fin).

It is not a safe tank mate for fellow tetras, because it will eat small fish, nor is it a safe tank mate for larger species, because it is a notorious lepidophage.

Bucktooth tetra are best kept alone or in large planted tanks that provide adequate protective coverage for other species.

It is otherwise extremely hardy and can live in home aquaria for more than ten years.