Oldest Known Tadpole Fossil Unearthed in Argentina

The 161-million-year-old fossil offers new insights into the evolution of frogs and their life cycle.

The fossil, found in Patagonia, Argentina, is the oldest tadpole ever discovered, dating back 161 million years.
This discovery pushes the record for the earliest known tadpole back by 20 million years, providing evidence of early frog metamorphosis.
The tadpole, from the extinct species Notobatrachus degiustoi, was exceptionally well-preserved, showing features similar to modern tadpoles.
The fossil's condition allowed scientists to identify soft tissues like eyes and nerves, offering a rare glimpse into its ancient life.
Researchers suggest the tadpole's large size was due to a lack of predators and competitors in its habitat, allowing it to thrive.