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Brazilian Researchers Find Giant Turtle Fossil in the Amazon — And Reveal It Lived Millions of Years Ago

Written by Valdemar Medeiros
Published on 16/07/2025 at 11:20
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Brazilian Scientists Discover Rare Fossil of Giant Turtle in the Amazon, Expanding Knowledge About Paleontology in Brazil and Revealing Unique Details About This Prehistoric Turtle That Lived Millions of Years Ago

Brazilian researchers made an impressive discovery by locating, deep in the Amazon rainforest, a fossil of a giant turtle that lived millions of years ago. The finding was recently published in a study in the scientific journal Biology Letters, from the prestigious Royal Society, and it promises to rewrite part of the evolutionary history of reptiles in South America. This discovery not only expands knowledge about prehistoric species but also reinforces the importance of paleontology in Brazil on the international stage.

Giant Turtle in the Amazon Lived Over 13 Million Years Ago

According to the study led by specialists from the National Institute for Amazonian Research (INPA) and the Federal University of Amazonas (UFAM), the fossil in the Amazon corresponds to a species of giant turtle that lived about 13 million years ago. The fossil was found in sedimentary layers of the Solimões Formation, located in the western part of the Brazilian Amazon, near the municipality of Eirunepé (AM).

The turtle belongs to the genus Peltocephalus, a group that still has living representatives, such as the Amazonian river turtle (Peltocephalus dumerilianus), but the fossil specimen has characteristics of a size significantly larger than modern specimens.

Importance of the Fossil in the Amazon for Paleontology in Brazil

This finding is considered unprecedented not only due to the age of the fossil but also because of its location. According to Brazilian researchers, this fossil represents the most recent known record of a giant freshwater turtle in the Amazon, dating from the late Pleistocene, a period when it was believed that large turtles had already disappeared from the region.

Brazilian researchers find fossil of giant turtle in the Amazon — and reveal that it lived millions of years ago
Fossil of Stupendemys geographicus found in Acre measures 1.80 meters wide (Edson Guilherme/Ufac)

Until now, the best-known fossils of giant turtles were found in other regions of South America, such as in Colombia, with the famous species Stupendemys geographicus.

The research highlights that the new discovery expands the fossil record of the Amazon and confirms that millions of years ago, the region housed an ecological diversity as rich as it is today, including prehistoric turtles of large proportions.

How Brazilian Researchers Found the Prehistoric Turtle

The discovery of the fossil in the Amazon occurred after bone fragments were found by miners in the Rio Madeira Formation in Rondônia and were subsequently analyzed by researchers from the National Institute for Amazonian Research (INPA), the Federal University of Amazonas (UFAM), and other Brazilian scientific institutions. The fossil includes parts of the shell, plastron (lower part), and fragments of cranial bones.

The fossils were found in a geological context dated to the Middle Miocene, a period marked by significant climatic and environmental changes on the planet.

The Solimões Formation, where the remains were located, is considered one of the most important paleontological sites in South America, known for its rich deposits of aquatic and terrestrial fossils.

Characteristics of the Prehistoric Turtle Found in the Amazon

Among the most relevant details of the discovery is the size of the giant turtle fossil in the Amazon, estimated to be over one meter long from the shell, which represents double the size of modern species of the same genus.

In addition to the large size, Brazilian researchers noted significant morphological differences, such as greater bone thickness of the shell and adaptations in the skull, suggesting dietary habits different from those of the current species representatives.

These characteristics reinforce the hypothesis that the Amazonian environment of the Miocene provided ideal conditions for the emergence and development of giant reptiles.

The Amazon Ecosystem Revealed by the Fossil of the Giant Turtle

The presence of a large prehistoric turtle in the Amazon offers valuable clues about the Miocene ecosystem.

According to the study’s authors, the region likely featured a vast system of lakes, rivers, and swamps, similar to a megabasin, favoring the development of large aquatic species.

Previous studies had already indicated that ancient Amazonia was inhabited by large crocodiles, giant fish, and extinct mammals. The inclusion of giant turtles in this context contributes to a more complete understanding of the prehistoric Amazonian biodiversity.

How Does Paleontology in Brazil Gain Space with the Discovery?

The repercussions of the discovery extended beyond national borders, being reported in international vehicles specialized in science, such as Science Alert and New Scientist. This highlights the growing recognition of paleontology in Brazil as a reference in the study of fossils from tropical regions.

Brazilian researchers emphasize that the finding reinforces the need for more investments in paleontological research in the Amazon, a region still little explored from a scientific perspective but with the potential to reveal important secrets of the history of life on Earth.

The Scientific and Environmental Impact of the Fossil in the Amazon

In addition to contributing to the reconstruction of the evolutionary history of reptiles, the study of the fossil in the Amazon may also provide useful information for the conservation of current species. Understanding how turtles evolved and responded to climate changes over millions of years can help in formulating more effective environmental policies, especially in a scenario of increasing deforestation and climate change.

The researchers involved in the analysis of the fossil highlight the potential of the Solimões Formation for future paleontological discoveries, reinforcing the importance of broadening investigations in the region to identify new remains of prehistoric turtles and other extinct species. The goal is to deepen the understanding of the ancient Amazonian fauna and its interaction with the environment.

Why Is the Discovery of the Prehistoric Turtle in the Amazon So Relevant?

The discovery of the giant turtle fossil in the Amazon is a milestone for paleontology in Brazil and for global science. The finding contributes not only to enriching the fossil record of the region but also to valuing Brazilian scientific research on a globally relevant topic.

The identification of such an ancient prehistoric turtle in Amazonian territory shows that the forest’s past is as fascinating as its current biodiversity. Furthermore, it highlights the fundamental role of Brazilian researchers in conducting cutting-edge studies on the history of life on the planet.

For the general public, the discovery serves as a reminder of the importance of preserving the Amazon, a true natural laboratory that still holds many secrets to be revealed.

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Valdemar Medeiros

Formado em Jornalismo e Marketing, é autor de mais de 20 mil artigos que já alcançaram milhões de leitores no Brasil e no exterior. Já escreveu para marcas e veículos como 99, Natura, O Boticário, CPG – Click Petróleo e Gás, Agência Raccon e outros. Especialista em Indústria Automotiva, Tecnologia, Carreiras (empregabilidade e cursos), Economia e outros temas. Contato e sugestões de pauta: valdemarmedeiros4@gmail.com. Não aceitamos currículos!

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