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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,379 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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Drift
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Until I find out that these theory's have been accepted by some world rebound expert on therapods,I'm not hopping on the spino's grossly over estimated stat sheet bandwagon.Claims of 20 tonnes and stretching to ridiculous lengths must be the only reasons that people think it would best a Tyrannosaurus in a fight IMO.
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Sicilianu
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I feel like this is a match between a large greyhound and a small pitbull. The spino does have a size advantage, but the T. rex is incredibly powerful, even for its size. I think the T. rex wins more often then not.
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genao87
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Taurus
Jan 16 2012, 08:53 AM
genao87
Jan 16 2012, 04:28 AM
Taurus
Jan 16 2012, 12:32 AM
^ it don't say that it will applied to other theropods as the article do not mention of this.
It is just a new calculation method to measure the size of dinosaurs. It does not apply to just one animal. Yeah that precise article doesnt talk about it, but this new method was discussed in detailed before this forum went down, well the old forum.

If this is correct, dinosaurs weigh more than what we thought, though not much more.


It don't say that the new calculation method will applied to other dinosaurs (which comes in various sizes, length and height?)....
Okay, let me repeat myself again. This is not mentioned in the article. It is a group of scientist who developed a new means of calculating weight. Under this new system, dinos are heavier. This is just an article on how it was applied on T. Rex.

As you know, there are more than one method in trying to find out the size of dinosaurs, this is a new one. I dont know why in the world do you think it can be accounted for only 1 dino. It is just a new calculation method that is all. The article just talks about T. Rex weighing under this new scheme.

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Taurus
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^ So a 20tons Spino is more realistic than a 14tons Spino? Not mentioned that Spino is more gracile...
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7Alx
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20 tons sounds too much, and was Spinosaurus even heavier than 90 ft average Diplodocus, which weight about 16 tons? I don't think so.
I know Therrien and Henderson estimated that Spinosaurus could weigh over 20 over. However they estimated its length of only 12.6 to 14.3 m. Also i heard that these guys estimated Giganotosaurus weight of about 17.4 tons  :o . This must be huge overstimated. Their methods are just BAD, because they made them in the same proportions as other large carnivorous dinosaurs.
Edited by 7Alx, Jan 17 2012, 04:58 AM.
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genao87
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Jan 17 2012, 01:04 AM
^ So a 20tons Spino is more realistic than a 14tons Spino? Not mentioned that Spino is more gracile...
You should read about the Cube Square law or whatever it is called. It was used to escalate the size the spino. TheRoc can give you more information on this and how it helps clear things on Spino's size. Sad all the info was erased, there was probably a 17 page thread about Spino and the Cube Square law.

Generally I believe Spino to be 15-16 tons with this Cube Square or more. Its jaw bite force was second only to T. Rex. So Spino was no joke in the jaws department
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Sicilianu
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Can you provide a source indicating that spinosaurus had noteworthy jaw pressure?
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DinosaurMichael
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Sicilianu
Jan 17 2012, 08:15 AM
Can you provide a source indicating that spinosaurus had noteworthy jaw pressure?
From what I heard. I found out that Spinosaurus has a bite force of 3 tons. I heard it from genao87. Ask him. He probably has the source.
Edited by DinosaurMichael, Feb 3 2012, 11:05 AM.
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Taurus
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DinosaurMichael
Feb 3 2012, 10:59 AM
Sicilianu
Jan 17 2012, 08:15 AM
Can you provide a source indicating that spinosaurus had noteworthy jaw pressure?
From what I heard. I heard about Spinosaurus having a bite force of 3 tons. I heard it from genao87. Ask him. He probably has the source.
A 3 ton bite force for a largest theropod wasn't that much for its size.
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DinosaurMichael
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Taurus
Feb 3 2012, 11:06 AM
DinosaurMichael
Feb 3 2012, 10:59 AM
Sicilianu
Jan 17 2012, 08:15 AM
Can you provide a source indicating that spinosaurus had noteworthy jaw pressure?
From what I heard. I heard about Spinosaurus having a bite force of 3 tons. I heard it from genao87. Ask him. He probably has the source.
A 3 ton bite force for a largest theropod wasn't that much for its size.
Yes, but 3 tons is still quite alot. That's somewhere you still wouldn't want to stick your hand in. :P
Edited by DinosaurMichael, Feb 3 2012, 11:09 AM.
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TheROC
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Made a new scale using Scott Hartman's newest Spinosaurus skeletal that he posted earlier in January. http://shartman.deviantart.com/

The results:

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The smaller Spino is the 14 meter Stromer holotype, the larger is meant to represent MSNM V4047.

Anyway, I promise, that I did not alter the proportions here whatsoever. The results simply ended up that huge surprisingly. I used exactly the skeletals Hartman provided and scaled them accordingly.

Also note, that I used Hartman's skeletal drawing for Stan instead of Sue. The reason for this is because his Sue skeletal drawing does not include
a scale meter bar. Which is what I use to quickly scale one skeletal drawing to another (by making the 1 meter scale bars equal sized between the
two pictures.) Sue is 42 feet vs Stan at 40.1 feet, so about a ~5% difference dimensionally.

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Taurus
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Don't Spino's sizes get changed all times? I won't hold my breathe if the new size is accuate. Anyways the only advantage Spino has is just size but it's also disadvantage too.
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Bright Nights
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Tyrannosaurus rex is the ultimate land predator; grows up to 8 tons, with 10-inch horn-like teeth, and 3 metric tons of force behind those jaws.

I think it could inflict serious wounds on Spinosaurus, but if Spinosaurus can knock the T. rex over with it's overwhelming size, I say he can will as well.
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Wolf Eagle
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Again it really depends upon the size of the Spinosaurus. At parity, I favor the Rex. But the MSNM V4047 Spinosaurus, is way to big. The Rex would lose against that.
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DinosaurMichael
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Bright Nights
Feb 3 2012, 12:17 PM
Tyrannosaurus rex is the ultimate land predator; grows up to 8 tons, with 10-inch horn-like teeth, and 3 metric tons of force behind those jaws.

I think it could inflict serious wounds on Spinosaurus, but if Spinosaurus can knock the T. rex over with it's overwhelming size, I say he can will as well.
Um doesn't T-Rex have a bite force of 6-7 tons? That's what I heard.
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