This genus was described by Grant et al. (2006) and includes three Brazilian species. Surprisingly, despite differences in size, A. castaneoticus and A. quinquevittatus have been shown to be more closely related to A. galactonotus than to the more similar-sized Ranitomeya. In any case, the species in this genus are not very closely related to each other, as shown by the very long branch lengths in species of this clade. Synapomorphies are all molecular. Grant et al. (2006) assigned Dendrobates captivus to this genus on the basis of dorsal patterning, a relationship that was later rejected by Twomey & Brown (2008).