 Heterodontosauridae includes the genera "Abrictosaurus", "Lycorhinus", and "Heterodontosaurus", all from South Africa.While Richard Thulborn once reassigned all three to "Lycorhinus", all other authors consider the three genera distinct.Within the family, "Heterodontosaurus" and "Lycorhinus" are considered sister taxa, with "Abrictosaurus" as a basal member.