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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,295 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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Replies:
theropod
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palaeontology, open source and survival enthusiast
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dinosaur
Jan 8 2013, 04:10 PM
brolyeuphyfusion
Dec 26 2012, 02:34 PM
dinosaur
Dec 26 2012, 04:52 AM
Just look at the size of the snout and head of Tyrannosaurus!  :o That should be a very useful weapon.
But is overcome by Spinosaurus' size and strength advantages...
And tyrannosaurus overcomes spinosaurus s abilities with skill, neck and leg muscles twice as powerful, and special weaponary.
My patience is about to come to an end! T. rex leg muscles are totally dwarfed by those Spinosaurus likely had, so stop claiming BS! While T. rex has a far more massive skull and more impressive neck, due to its sheer size spinosaurus can still keep up with it in terms of neck msucularity. And the "skill" is irrelevant. we have evidence for spinosaurus to ahve fought as well, and while T. rex is undoubtedly more used to and also more well suited to deal with large herbivores, Spino can still easily kill it the way it managed to hold its ground agaisnt Carcharodontosaurus saharicus/iguidensis, Deltadromaeus agilis, Bahariasaurus ingens, Sauroniops pachytholus and countless smaller predators like Rugops and Suchomimus (the latter, while characterised as "smaller here" approached T. rex´s dimensional size!).
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Black Ice
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Drom King
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theropod
Jan 2 2013, 06:45 AM
Now that was finally at least a phrase that one could understand! Keep up the good work and soon you will make complete sentences!
lol
Anyways I now favor spinosaurus here coz it's got a sail :D (joking about the sail part)
Anyways has this finally reached mutual agreeance yet? This is just like lion v tiger or wolf vs hyena, total flame war.
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theropod
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not exactly, a lion and a tiger or a hyaena and a wolfe are in the same size range...

That this is so debated is imo mainly due to a fair amount of bias on both sides, which keeps the debate alive, otherwise there would have been some logical conclusions by now.
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SpinoInWonderland
The madness has come back...
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theropod
Jan 9 2013, 01:09 AM
That this is so debated is imo mainly due to a fair amount of bias on both sides\
Mostly on the Tyrannosaurus side though...
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TyrantLizardKing
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I admit there is more bias on the Tyrannosaur's size, but it would still beat Spinosaurus. Spinosaurus was likely smaller than most people believe on this thread. I have a feeling the 16-18 m estimates will be debunked.
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SpinoInWonderland
The madness has come back...
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TyrantLizardKing
Jan 9 2013, 01:30 AM
I have a feeling the 16-18 m estimates will be debunked.
I can't see how they will ever be debunked any time soon, seeing that there is no reason to assume that Spinosaurus has proportionally big-headed compared to it's relatives
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TheROC
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brolyeuphyfusion
Jan 9 2013, 01:54 AM
TyrantLizardKing
Jan 9 2013, 01:30 AM
I have a feeling the 16-18 m estimates will be debunked.
I can't see how they will ever be debunked any time soon, seeing that there is no reason to assume that Spinosaurus has proportionally big-headed compared to it's relatives
Why would you make a prediction like this?

They could just as easily discover something tomorrow that shows that they do.

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SpinoInWonderland
The madness has come back...
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TheROC
Jan 9 2013, 01:58 AM
brolyeuphyfusion
Jan 9 2013, 01:54 AM
TyrantLizardKing
Jan 9 2013, 01:30 AM
I have a feeling the 16-18 m estimates will be debunked.
I can't see how they will ever be debunked any time soon, seeing that there is no reason to assume that Spinosaurus has proportionally big-headed compared to it's relatives
Why would you make a prediction like this?

They could just as easily discover something tomorrow that shows that they do.

It is less speculative than the large-headed Spinosaurus...
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TheROC
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We don't know either way.

We don't have a full body, or even a full skull.
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theropod
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A feeling is not enough. There is currently no reason to suspect so.
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TyrantLizardKing
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I know a feeling is not enough, I never said I believed in the 14 m Spinosaurus, I think that in the future paleontoligists and papers will give lower estimates, such as Andrea Cau's 14,4 m Spinosaurus.
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MysteryMeat
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There's some debate on how big Spinosaurus holotype is exactly. There's no fossils to be measured. We can only go by the drawn figures and listed measurements, which are in some cases contradictory. For example, the size of the dentary compare to the vertebra is not consistent with the numbers listed in the paper.
Secondly, there could be both ontogenetic and systematic differences between these Spinosaurus specimens. The better preserved specimens are not of the same age, and are from the opposite ends of the sahara.
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dinosaur
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brolyeuphyfusion
Jan 8 2013, 04:43 PM
dinosaur
Jan 8 2013, 04:10 PM
brolyeuphyfusion
Dec 26 2012, 02:34 PM
dinosaur
Dec 26 2012, 04:52 AM
Just look at the size of the snout and head of Tyrannosaurus!  :o That should be a very useful weapon.
But is overcome by Spinosaurus' size and strength advantages...
And tyrannosaurus overcomes spinosaurus s abilities with skill, neck and leg muscles twice as powerful, and special weaponary.
Skill is irrelevant, Spinosaurus doesn't fight with it's neck, and Spinosaurus has stronger leg muscles, it needs to support a more massive body! How the hell can an animal only half the size have 2x stronger leg muscles!? Your "special weapons" for Tyrannosaurus are pure fantasy
Like this
http://www.google.com/imgres?q=rex+spino+revenge&um=1&hl=en&tbo=d&biw=1280&bih=876&tbm=isch&tbnid=DIEILjBRYwRW-M:&imgrefurl=http://teratophoneus.deviantart.com/art/Spino-vs-T-rex-the-revenge-205110459&docid=U2M194RxjbNuVM&imgurl=http://fc05.deviantart.net/fs71/i/2011/106/e/6/spino_vs_t_rex_the_revenge_by_teratophoneus-d3e488r.jpg&w=900&h=675&ei=tGvsUK_YIMjyqwGE1IDoCQ&zoom=1&iact=hc&vpx=2&vpy=90&dur=556&hovh=194&hovw=259&tx=136&ty=112&sig=114265578592380353653&page=1&tbnh=140&tbnw=192&start=0&ndsp=32&ved=1t:429,r:0,s:0,i:87
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TheROC
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...I don't see the point of the illustration?

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dinosaur
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brolyeuphyfusion
Jan 8 2013, 04:43 PM
dinosaur
Jan 8 2013, 04:10 PM
brolyeuphyfusion
Dec 26 2012, 02:34 PM
dinosaur
Dec 26 2012, 04:52 AM
Just look at the size of the snout and head of Tyrannosaurus!  :o That should be a very useful weapon.
But is overcome by Spinosaurus' size and strength advantages...
And tyrannosaurus overcomes spinosaurus s abilities with skill, neck and leg muscles twice as powerful, and special weaponary.
Skill is irrelevant, Spinosaurus doesn't fight with it's neck, and Spinosaurus has stronger leg muscles, it needs to support a more massive body! How the hell can an animal only half the size have 2x stronger leg muscles!? Your "special weapons" for Tyrannosaurus are pure fantasy
Like this.
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