The biggest dinosaurs that lived on Earth

[DinoFan83]

@tigerluver 

Just noticed your posts regarding the masses of Notocolossus and Dreadnoughtus, and I think there's some stuff you may like to know.

About Dreadnoughtus: It's actually pretty good-sized; probably larger than the Bates estimate. SVPOW gives a volume of 57 square meters for the skeletal the discoverers put together (here). At a density of 0.85, this gives us a mass of 48.45 tonnes. Still a fairly large animal, by any standard. And seeing as the holotype seems to have been a juvenile, I think the aduit may have been in the territory of the really, really big 70 plus tonne sauropods like Argentinosaurus and Mamenchisaurus.

About Notocolossus: Assuming similar proportions to relatives (lognkosaurian titanosaurs and close relatives), 45-76 tonnes may actually hold up. Scaling from a 30 meter and 50 tonne Futalognkosaurus with a 1.56 meter humerus gives 71.8 tonnes, scaling from Paleo King's 90 plus tonne Argentinosaurus with a ~2.2 meter humerus estimated gives 46 plus tonnes, scaling from a 48.45 tonne Dreadnoughtus with a 1.6 meter humerus gives 64.48 tonnes, and scaling from a 53 tonne Patagotitan with a 1.65 meter humerus gives 64.32 tonnes. Reply