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(09-18-2019, 03:20 AM)DinoFan56 Wrote: 1: Oh, you mean what Franoys got? They used all the biggest specimens in Giganotosaurus size territory for that, and it doesn't necessarily mean all equated to 12.47 meter, 7 ton Mapusaurus.
For instance, MCF-PVPH-108.202 is 12.2 meters, so yes the exact sizes do vary. A pubic shaft of that (MCF-PVPH-108.145) size would've been indicative of a larger animal, but one within the 12 plus meter size range
2: 10 ton Rex is also impossible - in fact, no theropod would have been over 9 tons save for Spinosaurus. That's beyond the biped weight limit
However, most carcharodontosaurids are fairly poorly known, so we're extrapolating from other dinos. As I said, an 8.5 ton Mapu seems perfectly reasonable to me going by that
2:
1: Mapusaurus is "larger" than Giganotosaurus, but that is probably just because it was more robust, but even then, the animal seems to be no longer than Giganotosaurus. All the measurements presented and the calculations of Franoys lead to an animals of similar size of Giganotosaurus although heavier, but not close to the large weight of Tyrannosaurus.
2: Why you think that a 10 ton T. rex is impossible? Many calculations suggest that it could reach that weight. From my point of view I think that a T. rex of 9 tons in the "maximum", but who knows...
3: Spinosaurus was not ever near to 8 tons, it was long but light in built, so not a challenge for the large Carcharodontosaurids or T. rex.
This is DinoFan56 responding. I am permanently stuck out of my old account and had to make a new one.
1: As I already said, that skeletal was made with every Mapusaurus in Giganotosaurus size territory, which a 13.6 meter, 8.5 ton animal fits into, as does a 12.2 and 12.7 meter Mapusauruses. So I have yet to see what exactly is so inaccurate about an 8.5 ton Mapusaurus, especially considering that, as previously stated, large theropods in general had very large weight variations
2: The largest T rex fossils suggest animals of about 8 tons, for one. For another, any land predator over 9 tons is not going to have a very easy time finding enough food.
And finally, about the weight limit, a small error was made on my part - bipeds CAN get over 9 tons. However, they need a graviportal build (think sauropods and elephants), which T rex lacked. So, considering that both the fossil and physical evidence does not support it, a 10 ton T rex seems rather unrealistic.
3: Oh, sorry. That was a spelling error of mine you quoted.
What I meant that, since it is not bipedal, it could theoretically achieve a mass of over 9 tons. I am aware of Ibrahim and Franoys' work, they state 6.5-7.5 tons.
So no, Spino is not 10 tons. But, if I had to engineer any theropod to that size, it would be my choice.
Carnivorous dinosaurs other than the famous t-rex and spinosaurus..
