Although the sizes of the titanosaurs varied greatly, the largest dinosaurs known belong to this group, which includes Dreadnoughtus, Patagotitan, and Argentinosaurus. Dreadnoughtus, which had beens the longest, measuring 26 metres (about 85 feet) long, was superseded in length and weight in 2023 by a fossil specimen of Patagotitan mayorum, whose length was estimated at 37 meters (about 121 feet) long and whose weight was estimated at 63.5 metric tons (70 tons).
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