Giant dinosaur bones get archeologists rethinking Triassic period
BUENOS A IRES : Giant dinosaurs lived on Earth much earlier than previously thought, according to a team of excavators in Argentina who discovered the remains of a 200-million-year old species.
The species, baptised Ingenia prima, was about three times the size of the largest Triassic dinosaurs from its era. It was discovered in the Balde de Leyes dig site in San Juan province, 1,100 kilometres west of the Argentine capital Buenos Aires.
The find was published in the specialist Nature Ecology
Evolution journal on Monday and revealed in Argentina by the La Matanza National University’s Scient i f ic Di sseminat ion Agency.
“As soon as we found it, we realised it was something dif ferent. We found a shape, the f irst g iant one among all the dinosaurs. That’s the surprise,” said Cecilia Apaldetti, a government and San Juan University researcher.
Excavators found several vertebrae from the neck and tail as well as fore and hind leg bones.
The species “exhibits a growth strategy that was unknown until now and indicates that gigantism originated much earlier than was thought,” said Apaldetti, the study’s co-author.
The s e wer e “herbivor e dinosaurs, quadrupeds, easily recognisable by their very long neck and tail, and from the sauropod group,” she added.
Before this discovery, it was thought that gigantism developed during the Jurassic period, around 180 million years ago.
Fel low co- author Ricardo Martinez believes the Ingenia prima is from “a Late Triassic period, possibly 205 mil lion years” ago.
The Triassic period extended from around 250- 200 million years ago and the Jurassic from 200-145 million years ago.
The team has been studying the Triassic period, when dinosaurs were just beginning to appear. The first ones were small but as they evolved they tended towards gigantism to defend themselves against predators.
According to scientists, Ingenia prima was the first dinosaur species to reach gigantism and even though it was a long way from the 70 tonnes that the biggest sauropods weighed from the end of the Cretaceous period (145- 66 million ye a r s a g o ) , t he speed of bone tissue accumulation was greater than that of species from its era and the biggest giants that lived in Patagonia, in the south of Argentina.
The dinosaur’s bone fragments displayed cyclical and seasonal growth, with a different kind of tissue to other sauropods, which allowed it to grow very quickly.
It’s believed that the species grew to eight to 10 metres tall — the specimen found was a growing youth measuring six to seven metres — and weighed around 10 tonnes, equal to two or three African elephants. — AFP