Prosalirus
Encyclopedia
Prosalirus bitis is the name given to a fossil proto-frog found in Arizona
Arizona
Arizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...

 in 1995, which has primitive features, but has mostly lost the salamander-like traits of its ancestors. It has a skeleton designed to absorb the force of jumping with its hind legs and tail. It is thought to have lived 190 million years ago, well before the first known modern frog, the Sanyanlichan
Sanyanlichan
"Sanyanlichan" is the name given to a fossil that represents the earliest known "modern" frog. The fossil dates to approximately 125 million years ago , and was found in the fossil beds of Sihetun, in the western part of Liaoning province, China...

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