Aequidens is a genus belonging to the family Cichlidae. The family was founded in 1894 by Eigenmann. Quite a number of species from this area were first assigned to Aequidens but later moved to their current genus. Think of Andinoacara, Bujurquina, Cleithracara, Krobia, Laetacara, Rondonacara and Tahuantinsuyoa. Currently, the genus is home to 17 species.
The genus name Aequidens can be broken down into two Latin words. Aequus means ‘equal’ or ‘equally’. Dens or dentis means ‘teeth’. Roughly translated, it means something like ‘fish with equal teeth’.
Most of the species in this genus are found in the Amazon basin, Rio Orinoco and the rivers of the Guianas. Only two species occur outside this area: Aequidens inhabits the Rio Paraná basin and Aequidens tetramerus is found in the Rio Parnaiba.
The genus Aequidens has 17 officially described species: