‘King of gore’ dinosaur discovered


A new super-predator dinosaur that roamed the Earth 80 million years ago has been discovered in southern Utah.

It was closely related to its slightly larger relative, Tyrannosaurus rex, but lived earlier, making it the largest living land predator of its time.

Growing to about 30ft (9m) long, the predator has been named Lythronax argestes which means “king of gore”.

The research, published in the journal Plos One, highlights once more that the age of discovery is far from over.

The team also hopes this new find will help uncover what the climate was like towards the end of the age of dinosaurs.

“It’s always exciting to find new species but what’s really significant is what these species tell us about their ancient world,” said Randall Irmis, co-author of the study at the Natural History Museum of Utah, US.

“This was a very different place 80 million years ago. It was a very lush, wet, tropical environment and there were no polar ice caps at the time.”

Tyrannosaurid dinosaurs

Artist's impression of the new tyrannosaur Lythronax announced by paleontologists
  • Lythronax belongs to a group of carnivorous dinosaurs called Tyrannosaurids, the same group as the T. rex
  • They are the greatest carnivores – though not the largest – to have walked the Earth
  • Lived in the Late Cretaceous Period, between 95-70 million years ago
  • The new find lived on a strip of land called Laramidia in western North America
  • This same area was home to a range of species such as the the horned and duck billed dinosaurs
  • Recently an unusual new species of horned dinosaur with a big nose was also discovered in the area

Short snout

First discovered in 2009, the partial skeleton included a number of bones from the skull and some from the rest of the body. The fossils were then excavated and studied in the lab.

The new discovery was closely related to T. rex and shows that similar features evolved 10 million years earlier than previously thought.

Lythronax had a short and narrow snout and forward slanting eyes. Like its evolutionary relative, it had a head full of sharp teeth and was a ferocious predator, the largest of its ecosystem.

The team also uncovered the most complete fossils of another named species of Tyrannosaur – Teratophoneus curriei. It was previously only known from a few skull bones but the team now have more than 70% of its skeleton.

“There’s a whole diversity of different branches of the Tyrannosaur family tree that are waiting to be found out there,” Dr Irmis told BBC News.

It was previously unclear why there were so many different Tyrannosaurid species present in a similar area, as the animals were able to move around freely. The palaeontologists believe this was due to a changing of sea level.

“We think that when the sea level was high it was isolating areas in western North America that caused different species to evolve in isolation and that’s why we’re finding so many different species,” added Dr Irmis.

He explained that the creature had been named the “King of Gore” because of its super-predator status. The second part of its name “argestes” comes from Greek poet Homer’s naming of a south-westerly wind.

Lythronax fossil
Lythronax had binocular vision which made it a ferocious hunter

“Tyrannosaurids were the really large predators in their ecosystem. It’s fairly certain based on what we can see on their skull, teeth and body size they probably ate whatever they could fit in their mouths,” added Dr Irmis.

Apex predator

Another research member of the team, Joseph Sertich of the Denver Museum of Nature and Science, US, explained that the back of its skull was very wide which gave it good hunting eyes.

“One of the things that makes T. rex different from other dinosaurs is that it is able to look forward, it has binocular vision. Lythronax had that feature as well, its field of view could overlap which probably made it a better hunter,” Dr Sertich told BBC News.

“It was the apex predator of it’s time. It was the oldest advanced Tyrannosaur of its group, which is quite surprising.

“This is the tip of the iceberg. It’s amazing what we’re finding in southern Utah right now. You can walk over some of the hills and find fossils littering the sides of the slopes,” he added.

Mike Benton at the University of Bristol, UK, who was not involved with the study, said the new find was important for understanding patterns of evolution of the Tyrannosaurids.

“Previously, Tyrannosauri origins were uncertain, whether in Asia or North America, and the new find tends to suggest a mainly North American evolution for the group.”

Reconstructed skull and skeleton
The specimen discovered was 24ft long but was not a fully grown adult – estimated to be 30ft long

Scientists find ‘lonely’ floating planet without a star.


Reuters / Russell Cheyne

Reuters / Russell Cheyne

“We have never before seen an object free-floating in space that looks like this. It has all the characteristics of young planets found around other stars, but it is drifting out there all alone,” said Michael Liu, research team leader at the Institute for Astronomy at the University of Hawaii at Manoa. 

The planet, now known as PSO J318.5-22 has a mass roughly six times that of Jupiter and was formed only 12 million years ago. While that sounds ancient, in planetary terms it is considered a mere infant. 

“I had often wondered if such solitary objects exist, and now we know they do,” Liu said. 

During the past decade, extrasolar planets have been discovered at an incredible pace, with about a thousand found by indirect methods such as wobbling or dimming of their host stars induced by the planet. However, only a handful of planets have been directly imaged, all of which are around young stars (less than 200 million years old). PSO J318.5-22 is one of the lowest-mass free-floating objects known, perhaps the very lowest. 

Hundreds of extrasolar planets have been discovered since the mid-1990s. However, they are usually detected through indirect methods that rely on them orbiting a sun – the techniques measure a drop in the transmission of light as a planet passes in front of its star. Only a handful of them were directly imaged. 

AFP Photo / Ye Aung Thu

AFP Photo / Ye Aung Thu

However, this ‘lonely planet’ was accidently mapped as the team searched for brown dwarfs – a type of ‘sub-stellar’ object which emits a faint orangey-red glow to the human eye. The team was using the Pan-STARRS 1 wide-field survey telescope located on the Haleakala volcano of Hawaii’s Maui island. 

The study was published in the Astrophysical Journal Letters. Observations showed that while the planet indeed has similar attributes to that of a gas giant orbiting a star, it lacked its own. It further confirmed that it was not a brown dwarf, but a young planet, which will greatly benefit those seeking to observe it; as most planets with the same properties orbit young stars (less than 200 million years old) which tend to be extremely bright. 

Its most unique aspect is its similar mass, color, and energy output to directly imaged planets, the press release on the university’s website says.