Megadontognathus
Megadontognathus is a genus of ghost knifefishes found in river rapids in tropical South America. They are brown with a stubby snout and reach about  in total length.

Species
There are currently two described species in this genus:

 Megadontognathus cuyuniense Mago-Leccia, 1994
 Megadontognathus kaitukaensis Campos-da-Paz, 1999

References

Apteronotidae
Freshwater fish of South America
Ray-finned fish genera
Taxa named by Francisco Mago Leccia