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Spinosaurus News ~
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Requiem for the Spinosaurus, directly inspired from the 4th episod of the "Walking with dinosaurs" series (same music, same framework...). Spinosaurus, suchominus, ouranosaurus, paralititans and carcharodontosaurus are the meanest protagonists of the video. Nice !
Encounter between a spinosaurus and a giant croc, probably a sarcosuchus.
" Title: The Isle Fan Art: River Boyz. Artist: @greatestloverart " 
Ibrahim et al. have just published a new study on Spinosaurus. The original 2014 specimen's tail was found. The tail is ventrally elongated, like that of newt. As such, it is a powerful swimming adaptation. The other update they have is that with this new powerful tail, Spinosaurus center of mass indicates it was bipedal if it ever came on land.
Here is the paper. In the supplement we see mass estimations. Scroll down this page to see Spinosaurus swimming.  *This image is copyright of its original author  *This image is copyright of its original author As I read further, there are some more changes. The weight of Spinosaurus may have increased. Take a look at this table (took it from the excel supplement and fit it into a singe image):  *This image is copyright of its original author Spinosaurus' currently accepted weight estimates came from Henderson (2018). However, as Henderson preferred a Spinosaurus that wasn't adapted for swimming, he used a lower body density for mass estimation (3,218 kg for FSAC in the table above). Using a density closer to or greater than 1 as in swimming species, we see FSAC likely weighed at least 20% more. Consider how the bones of Spinosaurus are denser like that of penguins, FSAC likely weighed around 4,000 kg. As such, Henderson (2018) would have underestimated FSAC by 25%. The body length of FSAC in Ibrahim et al. (2020) is 10.37 m in natural pose and 10.93 in maximum length. The body length accepted for the largest Spinosaurus is at the lower end 15 m. Using isometry, MSNM-v4047 could be around 10-12 metric tons.  (04-30-2020, 12:28 AM)tigerluver Wrote: Ibrahim et al. have just published a new study on Spinosaurus. The original 2014 specimen's tail was found. The tail is ventrally elongated, like that of newt. As such, it is a powerful swimming adaptation. The other update they have is that with this new powerful tail, Spinosaurus center of mass indicates it was bipedal if it ever came on land. Man, you win me! I was just about to put this information, is the hot news of today! I have some poor "Spino-lovers" that for some reason are very angry agains me in FB because of this, as it confirms that this huge bug was a fisher  Now, returning to serious things, it is posible that the largest Spinosaurus was about 11 tons? Probably, because it is a swimer and for some reasons the acuatic animals are somewhat more dense, like you explained, however, I would like to see more information, because that animal is still very slender, just that now it have a wider tail. So, I am still inclined to a mass of 7-8 tons, or at least like the mass of a large T. rex (9 tons). Incredible, it seems that the toy company "Schleich" already hit the nail with this, as its Spino model of 2018 not only had the biped posture (it looks cuadruped but actually is just for the balance of the toy) but allready had the wide tail! Check mine:  *This image is copyright of its original author
Spinosaurus was the OG Gojira!..
Source Thefossilforum  *This image is copyright of its original author And Royal Tyrrell Museum of Palaeontology
TTorroo: " Final look for Spinosaurus Aegyptiacus.. known for First swimming dinosaurs that ever discovered . "
Indeed, a very dynamic depiction of Spinosaurus as a swimmer !
" Spinosaurus, by James Bear "
A spinosaurus's depiction as an active hunter...
Here too, the spinosaurus is depicted as a very activ predator...
Christian Reno: " Two Spinosaurus hunt Onchopristis ". Paleoart by Davide Bonadonna
An other depiction of an entirely aquatic spinosaurus...
" Spinosaurus and Onchopristis " by @joschuaknuppe 
For those of you that are wondering about 10-12 tonne Spinosaurus, we do indeed have a specimen that would be about that large: NMC 41852.
It's a partial humerus that would have measured 75 cm when complete when compared to the humerus of Baryonyx, and when applied to Spinosaurus skeletals, it would be 16.76 to 17.12 meters in axial length (link). Assuming a 15 meter long Spinosaurus is around 7.5-10 tonnes, this animal would scale to roughly 10.46 to 13.94 tonnes if it was 16.76 meters, and roughly 11.15 to 15.84 tonnes if it was 17.12 meters (I'd consider anything much above 13-14 tonnes.to be a tad too much BTW). This would make Spinosaurus the largest theropod, outmassing the largest Tyrannosaurus specimens by at least 2 tonnes and the largest carcharodontosaurids by at least 1-2 tonnes. |
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