The common name of "ghost frogs" may have been coined because of their occurrence in Skeleton Gorge in South Africa.
They are medium-sized frogs with triangular discs on the fingers and toes. The size is 1.4–2.6 in (35–65 mm). The body is flattened with protruding eyes, and the limbs are thin and long. The pupil is vertical, the tongue is disc-shaped, and the upper jaw bears teeth. The frogs swim well, with toes that are nearly fully webbed in some species. Most species have large dark spots on a paler background.
Adults are found in forest or riverine forest. These frogs take a range of insects, arthropods, and snails. They readily eat smaller species of frogs.