[pdevr]

From the BBC article: Weighing in at 77 tonnes, it was as heavy as 14 African elephants, and seven tonnes heavier than the previous record holder, Argentinosaurus.

According to the Wikipedia page about Dinosaur size[1], the biggest (and longest) dinosaur is Amphicoelias fragillimus (at 122 tons), not Argentinosaurus. So, won't this new dinosaur be the second heaviest?

[1] http://en.wikipedia.org/wiki/Dinosaur_size#Heaviest_dinosaur...

[tootie]

Keep reading. There was only one fossil found and described in the 19th century, then lost. The results can't be verified and the size estimate may be completely wrong.

[Zitrax]

That estimate seem to have been based on a single bone that was described in the 1870s, a bone that is now lost.

See https://en.wikipedia.org/wiki/Amphicoelias_fragillimus

[pdevr]

Got it, thanks to your and tootie's replies.