This group includes 8 genera in the subfamilies Arthroleptinae and Astylosterninae. The group is restricted to sub-Saharan Africa. Some arthroleptines have terrestrial development. Astylosternines have vertical pupils. Arthroleptids have cartilaginous sterna, in contrast to ranids. Trichobatrachus robustus is the Hairy Frog. Its skin has hairlike projections that are used in cutaneous respiration in the water. There are no fossils.