Triadobatrachus

Triadobatrachus ('triple-frog') is an extinct genus of frog-like amphibian, including only one known species, Triadobatrachus massinoti. It is the oldest member of the frog lineage known to science, and an excellent example of a transitional fossil. It lived during the Early Triassic about 250 million years ago, in what is now Madagascar.