It has long been known that various amphibians, including frogs and toads, lived during this time, and even much further back ...

"When I first saw the fossil, I said, 'Okay, it is a tadpole, there is no doubt,'" says biologist Mariana Chuliver, one of the paper authors. "But then when I saw it under the binocular microscope ...

“It’s not only the oldest tadpole known, but also the most exquisitely preserved,” said Mariana Chuliver, a biologist at ...

“It’s not only the oldest tadpole known, but also the most exquisitely preserved,” said study author Mariana Chuliver, a biologist at Buenos Aires’ Maimonides University. Researchers know ...

They likely ate insects and lived along the tadpole ponds, according to Mariana Chuliver Pereyra, palaeontologist from Maimónides University and the lead author of the new paper. "The adults were ...

This image provided by Mariana Chuliver shows paleontologist Matías Motta at the fossil site “Estancia La Matilde” in Patagonia, Argentina showing an adult specimen of the fossil frog ...

This image provided by Mariana Chuliver shows the oldest-known tadpole fossil found in Patagonia, Argentina. (Mariana Chuliver via AP) NEW YORK (AP) — Scientists have discovered the oldest-known ...

“It's not only the oldest tadpole known, but also the most exquisitely preserved,” said study author Mariana Chuliver, a biologist at Buenos Aires’ Maimonides University. Researchers know frogs were ...