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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,245 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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Godzillasaurus
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theropod
Feb 9 2013, 05:04 AM
I don't think anyone here denies that in the bite department T. rex is superior, but spinosaurus jaws are not useless, they are optimised for gripping large, tough and slippery fish. If it got a hold of T. rex, those teeth would make it hard to escape.

I think we all have seen the video of the alligator gar withstanding several hits with an axe, also some might have watched the episode of PD-files where it is concluded that the teeth of spinosaurus where very effective at puncturing.
No question, T. rex bite is more powerful and much better suited to kill large animals. However that of spinosaurus is still a powerful weapon it could have used in several ways to overpower and kill it's opponent, and to some degree it can make up for its deficiency by being larger, hence more durable. T. rex needed twice better bite (in absolute terms) to make up for its lack of size alone.
I wouldn't really consider t-rex superior in the department of weaponry. Like you said, the teeth of spinosaurus were pointed and conical, perfect for piercing large fish including mawsonia. My main argument lies within the fact that the tyrannosaurus might have a greater chance than the spinosaurus at parity due to its heavier build.
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theropod
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at parity the result of this fight is rather obvious to me.
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dinosaur
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Jinfengopteryx
Feb 9 2013, 06:58 AM
That discussion doesn't have anything to do with coolness!
But i keep telling you guys that T.rex will win, but you keep this topic go on and on and on!
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Carcharadon
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Because actually spinosaurus will win
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mega t.rex the magnificent
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Actually, t.Rex wins. like dinosaur said, it may be smaller, but he has better weaponary and it is the more skilled fighter. I know that size is an advanced advantage, but t.Rex weighs about the same as spino. Besides, u can't be a good fighter if u lack skills when fighting a larger opponent.

That is the only thing I will back up the biased fanboy for but no more backing him up.
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Carcharadon
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How dafuq does T.rex have better weaponry?

Also spinosaurus weighs over twice as much
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SpinoInWonderland
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mega t.rex the magnificent
Feb 9 2013, 02:26 PM
but t.Rex weighs about the same as spino
Actually it doesn't, Spinosaurus is much more massive...
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mega t.rex the magnificent
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Dark allosaurus
Feb 9 2013, 02:28 PM
How dafuq does T.rex have better weaponry?

Also spinosaurus weighs over twice as much
It has bone crunching teeth basically. And forget the gape.
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dinosaur
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brolyeuphyfusion
Feb 9 2013, 02:30 PM
mega t.rex the magnificent
Feb 9 2013, 02:26 PM
but t.Rex weighs about the same as spino
Actually it doesn't, Spinosaurus is much more massive...
Hey! U leave that poor dude alone! :angry:
He's my pal! agro
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SpinoInWonderland
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mega t.rex the magnificent
Feb 9 2013, 02:37 PM
Dark allosaurus
Feb 9 2013, 02:28 PM
How dafuq does T.rex have better weaponry?

Also spinosaurus weighs over twice as much
It has bone crunching teeth basically. And forget the gape.
Why forget the gape? That's just an excuse. The crushing bite of Tyrannosaurus needed it to sacrifice gape. A small gape means that it can't get a good bite on the flanks of Spinosaurus...
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Bandog
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brolyeuphyfusion
Feb 9 2013, 03:06 PM
mega t.rex the magnificent
Feb 9 2013, 02:37 PM
Dark allosaurus
Feb 9 2013, 02:28 PM
How dafuq does T.rex have better weaponry?

Also spinosaurus weighs over twice as much
It has bone crunching teeth basically. And forget the gape.
Why forget the gape? That's just an excuse. The crushing bite of Tyrannosaurus needed it to sacrifice gape. A small gape means that it can't get a good bite on the flanks of Spinosaurus...
Any theropod targeting flanks in these matchups is destined to fail. Stick with the head and neck.
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Jinfengopteryx
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Why is it gape small? I know it isn't as large as in Carnosaurs, but why does it mean that it's gape is would be that hindering, modern bone crushers are also able to bite opponents.
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Is that a pathethic gape?
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Grey
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The material on which work Dal Sasso et al. comes this summer (not in 2014 like I believed), wait until this.

I like Spinosaurus but some are far too confident in the absolute larger sizes of it. I always laugh when I read some comments like
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Spinosaurus is much more massive...
.

The hints I get are not that sure about this. Stop to be so affirmative regarding this yet poorly known taxon. Broly, will you cry if Spinosaurus is finally not as large as this, only within the first league of the land superpredators ? Or you'll simply reject it ?

Theropod, I suggest you should update your model of Spinosaurus skull which appears far too narrow in my opinion at the back. This sounds more like a scaled up Suchomimus skull in terms of width. Great model that said anyway.
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SpinoInWonderland
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Bandog
Feb 9 2013, 04:14 PM
Any theropod targeting flanks in these matchups is destined to fail.
Ummm, carnosaurs? Their slicing dentition and their wide gape, it seems that they target flanks and succeed...
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SpinoInWonderland
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Jinfengopteryx
Feb 9 2013, 06:29 PM
Why is it gape small? I know it isn't as large as in Carnosaurs, but why does it mean that it's gape is would be that hindering, modern bone crushers are also able to bite opponents.
Posted Image
Is that a pathethic gape?
A crocodile isn't as specialized for crushing as a tyrannosaurid is...
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