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Surprising Elephant-sized Mammal Cousin Lived Alongside Dinosaurs

Scientists announced the surprising discovery in Poland of fossils of a four-legged beast called Lisowicia bojani that demonstrated that dinosaurs were not the only behemoths on Earth at that time and that the group of mammal-like reptiles to which Lisowicia belonged, called dicynodonts, did not die out as long ago as previously believed.

Reuters

Updated:November 23, 2018, 9:56 AM IST
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Surprising Elephant-sized Mammal Cousin Lived Alongside Dinosaurs
Artistic reconstruction of the front view of the Triassic Period mammal cousin Lisowicia bojani is pictured in this illustration handout . (Image: Reuters)
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Washington: A stoutly built mammal cousin the size of an elephant that munched on plants with its horny beak roamed the European landscape alongside dinosaurs during the Triassic Period about 205 million to 210 million years ago, scientists said on Thursday.

Scientists announced the surprising discovery in Poland of fossils of a four-legged beast called Lisowicia bojani that demonstrated that dinosaurs were not the only behemoths on Earth at that time and that the group of mammal-like reptiles to which Lisowicia belonged, called dicynodonts, did not die out as long ago as previously believed.

"We think it's one of the most unexpected fossil discoveries from the Triassic of Europe," said paleontologist Grzegorz Niedzwiedzki of Uppsala University in Sweden.

Lisowicia, the largest-known non-dinosaur land animal alive at its time, was about 15 feet (4.5 meters) long, 8.5 feet (2.6 meters) tall and weighed 9 tons. The only other giants around at the time were early members of the dinosaur group called sauropods that had four legs, long necks and long tails.

A comparison of the Lisowicia bojani with a recent elephant is pictured in this illustration handout.

A comparison of the Lisowicia bojani with a recent elephant is pictured in this illustration handout. (Image: Reuters)

"The Lisowicia skull and jaws were highly specialized: toothless and the mouth was equipped with a horny beak, as in turtles and horned dinosaurs," Niedzwiedzki said, adding that it was unclear whether it had tusks as some of its relatives did.

The Triassic was the opening chapter in the age of dinosaurs, followed by the Jurassic and Cretaceous periods. The first dinosaurs appeared roughly 230 million years ago. Many of the earliest dinosaurs were modest in size, overshadowed by big land reptiles including fearsome predators called rauisuchians and crocodile-like phytosaurs.

"The late Triassic Period wasn't just the time of the rise of dinosaurs, it was also the time when the last dicynodonts decided to compete with dinosaurs. Finally, dinosaurs won this evolutionary competition," said paleontologist Tomasz Sulej of the Polish Academy of Sciences' Institute of Paleobiology.

Dicynodonts blended reptilian and mammalian traits. First appearing millions of years before the first mammals evolved in the late Triassic, these plant-eaters ranged in size from small burrowers to large browsers. They became the dominant land herbivores in the middle and late Triassic, but until now were thought to have died out before dinosaurs became the dominant land animals.

The scientists unearthed some 100 bone specimens representing several Lisowicia individuals at the Polish village of Lisowice.

An analysis of the creature's limbs showed its bones had a fast growth rate akin to a mammal or dinosaur.

The research was published in the journal Science.

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| Edited by: Ahona Sengupta
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