A cast went on display at the American Museum of Natural History in New York

So, it wasn’t quite as big as they first thought, but the dimensions of the colossal dinosaur unearthed in Argentina in 2014 still take your breath away.

Its fossil bones suggested at the time the animal – this week named – could have .

Further investigation by scientists now put its likely bulk at 69 tonnes.

However, that still makes it one of biggest dinosaurs ever discovered.

A team from the Museum of Palaeontology Egidio Feruglio, led by Dr Jose Luis Carballido and Dr Diego Pol, reports its interpretation of the bones in the .

The group had followed up the chance discovery in 2013 by a local farm worker of a bone protruding from desert rock near La Flecha, about 250km west of Trelew in Patagonia.

The excavation, , eventually produced hundreds of bones belonging to at least six individuals.

A cast of the largest skeleton was put on display in the American Museum of Natural History in New York, US, last year.

This animal was more than 37m in length. It was a sauropod – one of those long-necked, long-tailed, plant-eating dinosaurs like the famous creature.

The beast would have lived in Patagonia when it was lush and covered by forest, between 100 and 95 million years ago.

Even though the researchers have now scaled back their assessment of its dimensions, could still be the all-time record-holder.

It is possible another mighty titanosaur called was just as big. The difficulty in knowing for sure is that far fewer bones of have been collected and studied.

This makes estimating its true size a lot more uncertain.

Dr Diego Pol lies next to a Patagotitan femur

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