Ancient whale tooth discovered in Peru

A 36-centimeter tooth, longer than a school ruler and nearly as thick as an adult’s wrist, has been identified as belonging to Livyatan melvillei, a prehistoric whale, not a megalodon. The fossil was found in the Peruvian desert and is part of a larger set of marine fossils from the same area.

Fossil site reveals rich prehistoric marine life

The Pisco Formation in Peru, where the fossil was found, has yielded 890 marine vertebrate fossils. This indicates a time when Livyatan coexisted with the megalodon, two superpredators of similar sizes but with different hunting strategies.

Discovery made during field research

The fossil was found in November 2008 in the Pisco Formation, about thirty kilometers southwest of the city of Ica. Klaas Post, a researcher at the Museum of Natural History in Rotterdam, discovered the fossils during a field campaign.

Livyatan's size and naming history

Some of the teeth exceed 36 centimeters in length and 12 centimeters in diameter. The team that described the discovery in the journal Nature in 2010 estimated the creature’s length to be between 13.5 and 17.5 meters. The animal was initially named Leviathan but later renamed Livyatan due to administrative reasons.

Livyatan's unique hunting method

Unlike modern whales, which lack teeth on the upper jaw and hunt deep-sea squids using suction, Livyatan had functional teeth on both jaws. This allowed it to cut its prey rather than rely on suction.

Fossils now housed in Lima

The fossils prepared in Lima now belong to the collection of the Museum of Natural History of the National University of San Marcos. The Pisco Formation is considered a Fossil-Lagerstätte, a term used by geologists to describe a site with exceptional fossil preservation.

Recent research updates the timeline

A study published in the journal PLOS ONE on July 15, 2021, cataloged 890 marine vertebrate fossils from sixteen locations in the Pisco Formation. The specific site where Livyatan melvillei was found, Cerro Colorado, was mapped in detail by a study published in the Journal of Maps in 2015.

Fossil dating revised

The dating of the fossils has evolved with new research. Earlier estimates placed the fossils from 13 to 12 million years ago, but recent analyses have revised this to 9.9–8.9 million years ago, placing Livyatan in the Tortonian period.

New fossil discovery in Peru

In late November 2024, the Peruvian Geological, Mining, and Metallurgical Institute presented an almost complete skeleton of a young gavial of the genus Piscogavialis, about 3 meters long. This reptile, found in late 2023 in the Ocucaje desert, dates to 10–12 million years ago.

Coexistence of two giant predators

Livyatan melvillei was not the only top predator in its environment. The megalodon, a giant shark that has become nearly legendary, also inhabited the same oceans around the same time. Both reached sizes over ten meters, but their hunting methods were very different.

Competition and extinction mysteries

Paleontologists consider a form of indirect competition between Livyatan and the megalodon, as they likely hunted the same prey. This coexistence highlights a significant fact in ocean history: certain periods saw the emergence of multiple superpredator lineages, each reaching record sizes before becoming extinct. Understanding why these giants disappeared remains a major focus of modern marine paleontology.