A team of researchers from the CONICET and national universities identified a new species of ichthyosaur in Patagonia: Eternauta patagonica. This marine reptile inhabited the oceans about 150 million years ago and was characterized by its agility, exceptional vision, and specialization in hunting in the depths.
The discovery was made based on the study of a skull, a fin, and ribs found in the Vaca Muerta Formation, north of Neuquén, one of the most important fossil areas in the country. Through detailed analysis, scientists determined that it was a species unknown until then.
With a hydrodynamic body, long snout, and sharp teeth, this predator reached between five and six meters in length. Its extraordinary vision —with eyes about 25 centimeters in diameter— allowed it to detect prey in low-light environments, giving it an advantage over other marine animals.
The study also revealed an agile but fragile jaw, suggesting that Eternauta patagonica fed on small prey, such as fish or mollusks. Its ability to open and close its mouth quickly was a decisive adaptation for surviving in an ocean full of competitors.
The marine reptile that opens a window to the Cretaceous past
The discovery not only expands knowledge about ichthyosaurs but also provides valuable data on the marine biodiversity of Patagonia in the Late Jurassic. During that period, the territory now occupied by Neuquén was covered by warm and deep seas, full of large predators.
In that ecosystem, Eternauta patagonica occupied a particular niche: that of deep-sea hunters. Its giant eye and precise vision allowed it to survive in an environment where others could not compete. Thus, this reptile became a testimony to evolutionary specialization as an ecological strategy.
The Vaca Muerta Formation remains a key point for paleontological studies. Its geological layers preserve fossil remains that help reconstruct what marine life was like millions of years ago and how climatic and environmental changes shaped the species on the planet.
Connection with Cretaceous Expedition I
The discovery of Eternauta patagonica is closely linked to the Cretaceous Expedition I, a scientific initiative aimed at exploring and documenting the marine ecosystems of the past in Patagonia. This mission seeks to understand the evolution of aquatic vertebrates and their adaptations to the environment.
During the expedition, researchers used 3D modeling technology and biomechanical analysis to reconstruct the anatomy of the reptile. Thanks to these resources, they could infer its way of life and confirm its relevance within the lineage of South American ichthyosaurs.
The collaboration between teams from different institutions allowed for the articulation of conservation efforts, research, and scientific outreach. This joint work reinforces the importance of protecting the paleontological sites in northern Neuquén, where each discovery contributes to a better understanding of the ecological history of the planet.
The benefits of rescuing natural history
Initiatives like this have a profound environmental and educational impact. First, they promote the conservation of natural and geological heritage, highlighting the need to protect unique paleontological sites from industrial exploitation.
Furthermore, they foster interdisciplinary research and the training of new scientists in key fields such as evolutionary biology, geology, and marine ecology. Each fossil recovered provides information on how organisms adapted to climate changes in the past, offering useful lessons for the present.
Finally, the dissemination of these discoveries strengthens the bond between science and society, sparking public interest in nature and promoting a sense of identity with the Patagonian territory. Eternauta patagonica not only represents a paleontological discovery but also a symbol of how Argentine science can navigate between the past, present, and future to understand life on Earth.
