A skull with knife-like teeth has been unearthed in Peru's Ocucaje desert, and scientists believe it could belong to a new and ferocious species of the ancestor of modern whales, Basilosaurus, according to Live Science.

Iran Press/America: The name Basilosaurus means "king lizard". It was a prehistoric archaeocete whale that existed around 40 million years ago. Scientists suggest that Basilosaurus was one of the first fully aquatic cetaceans.

Researchers from the National University of San Marcos (UNMSM) in Lima told Reuters that the fossil is four feet long (1.2 meters), and could belong to a creature measuring about 39 feet (12 meters) long.

The creature remains officially unnamed; as of now, scientists call it "the "Ocucaje Predator". The beast will receive a name as soon as its description is published in a peer-reviewed journal.

The Ocucaje desert, according to scientists, was once the bottom of an ancient ocean. According to researchers, it is full of fossils, some of which date back more than 42 million years. Previous excavations have unearthed the remains of other modern whale ancestors, as well as dolphins and sharks.

Basilosaurus and its cousins were among the first fully aquatic cetaceans, although these ferocious beasts looked like a combination of a whale and a snake. They also had signature razor-sharp knife-like teeth. The fearsome ancient beast - with its name meaning "king lizard" - lived some 30-40 million years ago. They were among the apex predators - those who usually don't end up as prey.