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American Focus > Blog > Tech and Science > The oldest known fossil tadpole was a big baby
Tech and Science

The oldest known fossil tadpole was a big baby

Last updated: October 30, 2024 10:21 pm
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The oldest known fossil tadpole was a big baby
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A recent fossil discovery has shed light on the evolution of tadpoles, revealing that these aquatic creatures have been swimming in ponds for at least 161 million years. The finding, detailed in a study published in Nature, pushes back the record for the earliest known tadpoles by an additional 30 million years.

In 2020, a team of scientists on a dinosaur fossil-hunting expedition in Argentinian Patagonia stumbled upon hundreds of fossilized frogs belonging to the extinct species Notobatrachus degiustoi. Among these fossils was a remarkably well-preserved tadpole fossil embedded in a sandstone slab.

The fossil, identified as the same species as the adult frogs based on shared features of its vertebrae, was found to be in an advanced stage of development with its hind and forelegs partially formed. The preservation of soft tissues, including eyes and nerves, in the fossil provided valuable insights into the ancient tadpole’s anatomy.

The Notobatrachus degiustoi tadpole lived between 168 million and 161 million years ago, making it the oldest known tadpole to date. Prior to this discovery, the oldest tadpoles belonged to Shomronella jordanica, a species that lived around 130 million years ago in Israel. The fossilized tadpole’s filter-feeding apparatus, similar to that of modern tadpoles, suggests that this feeding strategy has been successful for millions of years.

Interestingly, the fossil tadpole was unusually large, measuring about 16 centimeters in length. This size is uncommon among modern tadpoles, with most species being only a few centimeters long. The discovery of a giant tadpole like Notobatrachus degiustoi challenges our understanding of tadpole size evolution.

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The findings from this fossil discovery provide valuable insights into the early evolution of tadpoles and highlight the enduring success of filter-feeding as a feeding strategy among these aquatic creatures. The study underscores the importance of studying ancient fossils in understanding the origins and evolutionary history of modern-day organisms.

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