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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,232 Views)
Wolf Eagle
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M E G A P H Y S E T E R
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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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Ausar
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So basically, we are so unsure about how big Spinosaurus really was that some of us are considering leaving this thread dead until some new size estimate comes out in the summer. Am I right?
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Jinfengopteryx
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Dinopithecus
Mar 10 2013, 12:01 AM
dinosaur
Mar 8 2013, 02:14 PM
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I don't see a picture.

He has shown a computer model of a Tyrannosaurus biting a Spinosaurus' neck.
Edited by Jinfengopteryx, Mar 10 2013, 12:15 AM.
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Big G
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T-Rex, because he is stronger than Spinosaurus.
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Carcharadon
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^ Nope, spinosaurus is stronger, because it is much larger.
Edited by Carcharadon, Mar 10 2013, 06:57 AM.
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dinosaur
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MrGiganotosaurus
Mar 10 2013, 02:42 AM
T-Rex, because he is stronger than Spinosaurus.
Right bro. Spinosaurus maybe large, but tyrannosaurus packs twice the muscle. In the neck and legs. Spinosaurus only has larger muscles in the arms. Also rex has better weapons.12 inch teeth and 2 foot Sharp foot claws. Also tyrannosaurus is the more skilled fighter, since it hunts challenging prey like triceratops and ankylosaurus, something spinosaurus can't do. Spino only hunts puny dinosaurs and fish.
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7Alx
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MrGiganotosaurus
Give me evidence about why you think T. rex was stronger?
DarkAllosaurus
We don't know how much Spinosaurus was bigger than T. rex? So saying It is much bigger is wrong. Ok. Spinosaurus might be that big, but not evidence that it is/must be.
Edited by 7Alx, Mar 10 2013, 07:30 AM.
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dino-ken
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Well - I think most can agree that Spinosaurus was larger(i.e. longer and taller). And it may have been stronger because it was larger. But the size estimates and mass estimates for Spinosaurus are all over the board from 14-18 meters, and from 7 tons to nearly 20 tons. So until we get more accurate estimates - it's hard to exactly say how much larger than T.rex, Spinosaurus was.

Personally while I agree Spinosaurus was the largest theropod, and certainly the largest in it's enviroment. I tend to think of it as nothing but a big bully(mostly show, little go), mainly using it's size to intimidate smaller Carcharodontosaurs and Abelisaurs in it's enviroment, basically stealing their kills. But I tend to doubt that it was much of actual fighter. It's well designed as a large Piscivore, and I can see it actually taking out medium size crocs in it's enviroment.

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MightyMaus
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dinosaur
Mar 10 2013, 07:14 AM
MrGiganotosaurus
Mar 10 2013, 02:42 AM
T-Rex, because he is stronger than Spinosaurus.
Right bro. Spinosaurus maybe large, but tyrannosaurus packs twice the muscle. In the neck and legs. Spinosaurus only has larger muscles in the arms. Also rex has better weapons.12 inch teeth and 2 foot Sharp foot claws. Also tyrannosaurus is the more skilled fighter, since it hunts challenging prey like triceratops and ankylosaurus, something spinosaurus can't do. Spino only hunts puny dinosaurs and fish.
My friend, please learn some basic facts. A 7 ton Tyrannosaurus would have far less overall muscle than a 14 ton Spinosaurus, that is flat out common sense. It's the same thing as saying a 400 lb Lion would have less muscle than an 800lb cheetah(TRUE). Also, Tyrannosaurus's teeth only stuck out of its skull 3-4 inches, and its foot claws were only ~6inches long. In fact, Spinosaurus had teeth, discounting the roots, longer than those of Tyrannosaurus.
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Jinfengopteryx
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dinosaur
Mar 10 2013, 07:14 AM
Spinosaurus maybe large, but tyrannosaurus packs twice the muscle.
If you were right, Tyrannosaurus would have to be an animal without bones, lungs, a stomach, a gut or anything else, just muscles.
That's obviously not the case, exept if you believe the found Tyrannosaurus skeletons are fossilized muscles.
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SpinoInWonderland
The madness has come back...
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Jinfengopteryx
Mar 10 2013, 08:13 PM
dinosaur
Mar 10 2013, 07:14 AM
Spinosaurus maybe large, but tyrannosaurus packs twice the muscle.
If you were right, Tyrannosaurus would have to be an animal without bones, lungs, a stomach, a gut or anything else, just muscles.
That's obviously not the case, exept if you believe the found Tyrannosaurus skeletons are fossilized muscles.
It would be a shapeless lump of muscles then, Spinosaurus would win be default. The skeletal system is needed for support, especially at this scale...
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Ausar
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brolyeuphyfusion
Mar 10 2013, 08:30 PM
Jinfengopteryx
Mar 10 2013, 08:13 PM
dinosaur
Mar 10 2013, 07:14 AM
Spinosaurus maybe large, but tyrannosaurus packs twice the muscle.
If you were right, Tyrannosaurus would have to be an animal without bones, lungs, a stomach, a gut or anything else, just muscles.
That's obviously not the case, exept if you believe the found Tyrannosaurus skeletons are fossilized muscles.
It would be a shapeless lump of muscles then, Spinosaurus would win be default. The skeletal system is needed for support, especially at this scale...
Furthermore, Spino would be able to eat the entire carcass! lol
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Jinfengopteryx
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Well, at least that would be a protein rich meal.
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Big G
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7Alx
Mar 10 2013, 07:29 AM
MrGiganotosaurus
Give me evidence about why you think T. rex was stronger?
DarkAllosaurus
We don't know how much Spinosaurus was bigger than T. rex? So saying It is much bigger is wrong. Ok. Spinosaurus might be that big, but not evidence that it is/must be.
T-Rex was the strongest of all Theropods.

He had a jaw pressure of 4 tonnes, while the Spinosaurus had pressure from the jaws of 2.5 t.
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Black Ice
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T.rex bit harder than 4 tons.......
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Carcharadon
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T.rex was NOT the strongest of theropods..... that is just a baseless assumption......
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