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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,365 Views)
Wolf Eagle
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Tyrannosaurus rex
Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. The species Tyrannosaurus rex (rex meaning "king" in Latin), commonly abbreviated to T. rex, is a fixture in popular culture. It lived throughout what is now western North America, with a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 67 to 65.5 million years ago.[1] It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event. Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to the large and powerful hindlimbs, Tyrannosaurus forelimbs were small, though unusually powerful for their size, and bore two clawed digits. Although other theropods rivaled or exceeded Tyrannosaurus rex in size, it was the largest known tyrannosaurid and one of the largest known land predators. By far the largest carnivore in its environment, Tyrannosaurus rex may have been an apex predator, preying upon hadrosaurs and ceratopsians, although some experts have suggested it was primarily a scavenger. The debate over Tyrannosaurus as apex predator or scavenger is among the longest running in paleontology. Tyrannosaurus rex was one of the largest land carnivores of all time; the largest complete specimen, FMNH PR2081 ("Sue"), measured 12.8 metres (42 ft) long, and was 4.0 metres (13.1 ft) tall at the hips. Mass estimates have varied widely over the years, from more than 7.2 metric tons (7.9 short tons), to less than 4.5 metric tons (5.0 short tons), with most modern estimates ranging between 5.4 and 6.8 metric tons (6.0 and 7.5 short tons). Packard et al. (2009) tested dinosaur mass estimation procedures on elephants and concluded that dinosaur estimations are flawed and produce over-estimations; thus, the weight of Tyrannosaurus could be much less than usually estimated. Other estimations have concluded that the largest known Tyrannosaurus specimens had a weight exceeding 9 tonnes.

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Spinosaurus aegyptiacus
Spinosaurus is a genus of theropod dinosaur which lived in what is now North Africa, from the lower Albian to lower Cenomanian stages of the Cretaceous period, about 112 to 97 million years ago. Spinosaurus may be the largest of all known carnivorous dinosaurs, even larger than Tyrannosaurus and Giganotosaurus. Estimates published in 2005 and 2007 suggest that it was 12.6 to 18 metres (41 to 59 ft) in length and 7 to 20.9 tonnes (7.7 to 23.0 short tons) in weight. The skull of Spinosaurus was long and narrow like that of a modern crocodilian. Spinosaurus is thought to have eaten fish; evidence suggests that it lived both on land and in water like a modern crocodilian. The distinctive spines of Spinosaurus, which were long extensions of the vertebrae, grew to at least 1.65 meters (5.4 ft) long and were likely to have had skin connecting them, forming a sail-like structure, although some authors have suggested that the spines were covered in fat and formed a hump. Multiple functions have been put forward for this structure, including thermoregulation and display. Dal Sasso et al. (2005) assumed that Spinosaurus and Suchomimus had the same body proportions in relation to their skull lengths, and thereby calculated that Spinosaurus was 16 to 18 meters (52 to 59 ft) in length and 7 to 9 tonnes (7.7 to 9.9 short tons) in weight. The Dal Sasso et al. estimates were criticized because the skull length estimate was uncertain, and (assuming that body mass increases as the cube of body length) scaling Suchomimus which was 11 meters (36 ft) long and 3.8 tonnes (4.2 short tons) in mass to the range of estimated lengths of Spinosaurus would produce an estimated body mass of 11.7 to 16.7 tonnes (12.9 to 18.4 short tons).

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Edited by Taipan, Apr 24 2015, 10:10 PM.
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Jinfengopteryx
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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theropod
Aug 26 2012, 04:35 AM
But you appearantly think bite force is everything.
Well, in a theropod battle, the only real target is the face, so it's very important.
theropod
 
This fight just isn´t fair at max size. Spinosaurus will be double the weight of T. rex, that´s just a fact. scaling the specimen Dal Sasso estimated at baryonyx proportions, we get 17,5m, and it is more likely that spinosaurus´ more robust, massive skull was proportionally shorter, 18m isn´t that unlikely. now for the weight: I don´t think there are any serious, recent estimates lower than 11t. when we use suchomimus we already get 13t, and it was much more slender and didn´t have a larger crest on it´s back.

Based on MNHN SAM 124 we I get 17,35m and ~13t, for the 1,75m skull Individual, but why should this be unfair, as I've written, bite force is important here, still I would back Spinosaurus.
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Fragillimus335
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Spinosaurus is just too massive for Tyrannosaurus to handle.
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TheROC
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The newer size scale in here is inaccurate for one reason; Spinosaurus and T.Rex are not at equal measure in hip height.
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Jinfengopteryx
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TheROC
Aug 26 2012, 05:35 AM
The newer size scale in here is inaccurate for one reason; Spinosaurus and T.Rex are not at equal measure in hip height.
At the minimum figure, they are at the same height.
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Fragillimus335
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Spinosaurus has a 1.5 meter height advantage at the hip over Tyrannosaurus.

Tyrannosaurus~3.4 meters
Spinosaurus~4.9 meters
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Megafelis Fatalis
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TheROC
Aug 26 2012, 05:35 AM
The newer size scale in here is inaccurate for one reason; Spinosaurus and T.Rex are not at equal measure in hip height.
Yes Tyrannosaurus is little big, Spinosaurus with 2m skull (larger than the typical skull which is estimated 1.5m-1.75m long) and it is 15m long
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theropod
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that however bases on speculation of the skull being larger proportionally.

@linfeng: basing this on other spinosaurus specimens is useless, because we have to determine their size as well. the holotype was even lost.

So it ough to make no difference whether you base the Dal Sassos specimens size on baryonyx or whether you determine another specimens size basing on it, and then use it to scale it up.
It´s unfair because Spinosaurus is double the size.
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Carcharadon
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Superpredator
Aug 24 2012, 12:27 PM
Black Ice
Aug 24 2012, 01:13 AM
The reason I said t rex would win is because of several things
1. Spinosaurus had claws and usable arms, but they were short, not even as long as allosaurus limbs. So how would it use them?
2. If you see a spinosaurid and tyrannosaurid skeleton at the same size, the spiny is very gracile compared to a tyrannosaur
3. Spino may be bigger, but due to its gracile build when compared to a tyrannosaur, I doubt its significantly stronger, if at all.
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4. Tyrannosaurus was the more robust,durable, and more powerful specimen, that counters spinos size adv.
I just don't see how spino could effectively hurt the tyrannosaur.
1) T.Rex had a 1m long arm, Spinosaurus' arm was MUCH longer (as proven by your comparison). The Spinosaurus needs to get in close, control the Rex's head and make some claw wounds.
2) And because of this, Spinosaurus is MUCH heavier.
3) It is probably quite a lot stronger (9 tons (at max) VS 18.4 tons).
4) Robust, yes, but a claw hit from a Spinosaurus to the head is a near instant kill. Durable, well, read the answer to robust. I don't see how a 9 ton animal (at max) could be more powerful than a 18.4ton animal.
Spinosaurus could hurt the Tyrannosaurus by 1) using it's claws, 2) controlling the head or 3) overpowering the Tyrannosaurus.
What source did you cite that gave you an "18.4 ton" estimate for Spinosaurus?
Edited by Carcharadon, Aug 26 2012, 11:02 AM.
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Carcharadon
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brolyeuphyfusion
Aug 10 2012, 01:15 AM
Just wait for my completely unbiased "Largest Theropods Size Comparison", and it will be way better than Prehistoric Cat's size comparisons combined!!! I'll be using Scott Hartman's skeletals, so it will be accurate...
Hey, whens it done
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FireCrown
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brolyeuphyfusion
Jul 9 2012, 12:29 PM
Grey
Jul 9 2012, 02:22 AM
cougarlionlover45
Jul 8 2012, 11:24 PM
Tyrannosaurus would win because the bite force the teeth and the Spino's height size isn't really a advantage cause rex could go up and bottom of his to it's throat and bite it so T-Rex
Frankly poor description.

How a 12 m predator could kill a 18 m one almost as dangerously armed at parity ?
Don't take him seriously, he's a T. rex fanboy

Spinosaurus would win, it has claws, size, a good bite, and a psychological advantage that comes with the size and also due to the fact that the sail makes the Spinosaurus look larger than it really is
i'm not a t rex fanboy
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SpinoInWonderland
The madness has come back...
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Dark allosaurus
Aug 26 2012, 11:02 AM
brolyeuphyfusion
Aug 10 2012, 01:15 AM
Just wait for my completely unbiased "Largest Theropods Size Comparison", and it will be way better than Prehistoric Cat's size comparisons combined!!! I'll be using Scott Hartman's skeletals, so it will be accurate...
Hey, whens it done
it's almost done, I'm just putting the labels/info in, and trying to find a good image of Ekrixinatosaurus
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Fragillimus335
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Hey Broly! I also see myself as a supporter of sauropods and a lone voice against the hordes of Rex fans!
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Carcharadon
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Edited by Carcharadon, Aug 28 2012, 09:48 AM.
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Carcharadon
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apexpredator7
Jan 16 2012, 04:22 AM
Drift
Jan 15 2012, 10:44 AM
apexpredator7
Jan 14 2012, 01:38 AM
The size advantage is way too great trex is overrated severely
I think the alleged size difference is what makes the spino overrated IMO
spino overatted :huh: , trex is overated infact the most overated thing EVER so many people dote on it because of it being the top carnivore in their childhood this needs be got over seriosly how can you say spino is overated against a trex???? trex used to be the best predator but now animals have been discovered which are superior
most overrated thing ever? Tigers, lions and pitbulls are more overrated than Tyrannosaurus rex
Edited by Carcharadon, Aug 28 2012, 09:51 AM.
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Fragillimus335
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Ehhh... apples and oranges, the fact is we are comparing the most popular and sentimentally cherished theropod of all time with a relative newcomer in the public view.
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