It comprises three species, one found in Sub-Saharan Africa and two found South Asia (with one also being found in Iran). The species are:[1][2][3]
Of the three species in this genus, O. sephaena was formerly placed in its own monotypic genus, Dendroperdix, while the two Asian species were formerly placed in Francolinus. Phylogenetic analyses support these three species grouping together as a distinct genus. The International Ornithological Congress has also accepted these results.[2][3]