Pelodryadidae
Scienitsts think of Pelodryadidae as a sister group to the leaf frogs (Phyllomedusidae). Those frogs live in trees and live in tropical places. Both families of frogs came from the same ancestor frog.  Scientists think this frog lived during the early Cenozoic in South America. The two groups of frogs would have become different from each other during the Eocene. The ancestors of the Pelodryadidae frogs probably went to Australasia by going to Antarctica first.  At the time, Antarctica was further north and not frozen, so frogs could live there. The clade comprising both families is sister to the Hylidae. They became different from the frogs in Hylidae during in the early Paleogene.