The family hylidae is composed of several hundred species, and most of the species are poorly known.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
One might almost say that tropical moist forests must have arboreal frogs and that these are made out of whatever suitable material happened to be available; in Australia and South America hylidae, in Africa Ranidae, since there Hylas are absent.
"Darwin and Modern Science"
A.C. Seward and Others