Scientists have confirmed the discovery of a new dinosaur species in Australia, one of the largest found in the world, more than a decade after cattle farmers first uncovered bones of the animal.
The plant-eating sauropod lived in the Cretaceous period between 92 million and 96 million years ago when Australia was attached to Antarctica, a research paper published on Monday said.
Paleontologists have estimated that the dinosaur reached a height of 5m to 6.5m at the hip and a length of 25m to 30m, making it as long as a basketball court and as tall as a two-story building.
That makes the new species the largest dinosaur ever found in Australia and puts it in the top five in the world, joining an elite group of titanosaurs previously only discovered in South America.
“Discoveries like this are just the tip of the iceberg,” Queensland Museum curator and paleontologist Scott Hocknull said.
Paleontologists have named the sauropod Australotitan cooperensis, combining “southern titan” with the name of a creek near where the first of the creature’s bones were found in 2006 on a cattle farming property in Eromanga in Queensland state.
The confirmation of the new species marks a 17-year-long journey to first unearth and then compare the bones of “Cooper,” as the dinosaur is more informally known, to other finds.
Dinosaur bones are enormous, heavy and fragile, and are kept in museums around the world, making scientific study difficult.
The team from the Eromanga Natural History Museum and the Queensland Museum used new digital technology for the first time to 3D scan each bone for comparisons.
“To make sure Australotitan was a different species, we needed to compare its bones to the bones of other species from Queensland and globally,” Hocknull said. “This was a very long and painstaking task.”
Robyn Mackenzie, who was mustering cattle with her husband Stuart on their property when they discovered the bones, founded the Eromanga Natural History Museum to house the find.
A swathe of other discoveries of dinosaur skeletons in the area, along with a rock shelf believed to have been a sauropod pathway, are still awaiting full scientific study.
“Palaeo Tourism has been huge globally, so we’re expecting a lot of international interest when our borders reopen,” said Mackenzie, now a field paleontologist.
Even larger dinosaur specimens are waiting to be discovered, given the plant-eating sauropods were generally preyed on by huge theropods, Hocknull said.
“We’ve found a couple of small theropod dinosaurs in Australia ... but it wouldn’t have bothered Australotitan, which suggests there is a very large predatory dinosaur out there somewhere. We just haven’t found it yet,” he said.
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