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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,203 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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Replies:
blaze
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Yes but I don't remember what it says and I can't access it right now but I think I can wait until I have access again haha
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Jinfengopteryx
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Why can't you access it? Does your computer have problems with PDF files?
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blaze
Carnivore
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My laptop died last thursday, it starts (and the fan spins like mad) but it doesn't boot, it's currently under service (?), supposedly I'm going to be told what's wrong with it this week and maybe it'll be another week until is repaired, in case that's possible of course haha
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Vobby
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I voted T-Rex due to my religious beliefs, then I started reading the thread, trying to actually learn something. I'm at page 16, it's damn a long way. I'm disappointed by how much uncertainty there is around spinosaurus size, weight and sail/hump/crest...
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Ausar
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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Vobby
Sep 25 2013, 07:08 AM
I voted T-Rex due to my religious beliefs, then I started reading the thread, trying to actually learn something. I'm at page 16, it's damn a long way. I'm disappointed by how much uncertainty there is around spinosaurus size, weight and sail/hump/crest...
This thread is 179 pages long, what made you want to read the ENTIRE debate? I learned my lesson back when it was only 60-ish pages long.


As for the thread, Spinosaurus still wins in my honest opinion.
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Vobby
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Well, there is nothing cooler than dinosaurs and, among them, there is nothing cooler than giant theropods, so I fell like I must read what you guys have debated until now about this two incredible beasts.

Edit: actually, there is no way I can go and read every single data, proof, corrections, pdf, book and paper you people have posted here, but if I don't, I just can't have a personal opinion... I guess I just have to decide who to believe (like in the tiger vs lion thread, I just decided to believe Asadas no matter what :P ). So... is there someone who partecipate in this debate who is a paleontologist/biologist or university student of this sciences? This could make everything much easier to me!
Edited by Vobby, Sep 25 2013, 11:17 AM.
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Jinfengopteryx
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Then you can look at Scott Hartmans size comparison:
http://www.skeletaldrawing.com/home/super-spinosaurus6282013
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Teratophoneus
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Vobby
Sep 25 2013, 11:11 AM
Well, there is nothing cooler than dinosaurs and, among them, there is nothing cooler than giant theropods, so I fell like I must read what you guys have debated until now about this two incredible beasts.

Edit: actually, there is no way I can go and read every single data, proof, corrections, pdf, book and paper you people have posted here, but if I don't, I just can't have a personal opinion... I guess I just have to decide who to believe (like in the tiger vs lion thread, I just decided to believe Asadas no matter what :P ). So... is there someone who partecipate in this debate who is a paleontologist/biologist or university student of this sciences? This could make everything much easier to me!
Well, Fragilimus is a university student, but is banned now.
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blaze
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Wait... what? since when? why?
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Jinfengopteryx
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He is banned since the beginning of this year, the explanation can be found here:
http://carnivoraforum.com/topic/9950276/6/
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Vobby
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Jinfengopteryx
Sep 25 2013, 11:00 PM
Then you can look at Scott Hartmans size comparison:
http://www.skeletaldrawing.com/home/super-spinosaurus6282013
Oh thank you! Scott Hartman is basically the man I wanted to be when I was a child... there was a period of my life in which I did nothing but drawing dinosaurs lol
Sadly, I never became good at it, I can only draw a decent running Tyrannosaurus. By the way, going with that size comparison, I would back Sue against that 15,6 m spinosaurus, but of course I'm no sure.
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blaze
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Jinfengopteryx
Sep 26 2013, 12:19 AM
He is banned since the beginning of this year, the explanation can be found here:
http://carnivoraforum.com/topic/9950276/6/
Since the beggining of the year? damn, I have memories of seeing posts of him in the last months, must of been my imagination.
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Super Kaizer Ghidorah
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SpinoInWonderland
Sep 25 2013, 04:20 AM
theropod
Sep 25 2013, 03:58 AM
Super Kaizer Ghidorah
Sep 25 2013, 01:17 AM
{Ignored post}
I hope you realise this is just because it is a wiki article from whose language you can already see it was mainly written by children, and from whose claims and structure you can immediately tell there is absolutely NO scientific data backing it up?

Damn, it claims it was 12m on average and 15 at maximum, and reached 6m tall!

EDIT: I've corrected the BS stated on that page. Let's see how long until some fanboy reverts it...
Ignore him. Most of his posts are guilty of points #1 and #3.

http://sauropodomorphlair.blogspot.com/2013/09/how-to-fight-fire-with-fire-against.html
Hey come on! I said I disagree with that source. I don't think t rex was 12 tons. It is about 7 to 8 tons.
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theropod
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Well, fair enough, on that point you're probably right. I just wanted to make sure you knew sources like that one have zero value anyway.
Edited by theropod, Sep 27 2013, 03:43 AM.
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thesporerex
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SpinoInWonderland
Sep 25 2013, 04:20 AM
theropod
Sep 25 2013, 03:58 AM
Super Kaizer Ghidorah
Sep 25 2013, 01:17 AM
{Ignored post}
I hope you realise this is just because it is a wiki article from whose language you can already see it was mainly written by children, and from whose claims and structure you can immediately tell there is absolutely NO scientific data backing it up?

Damn, it claims it was 12m on average and 15 at maximum, and reached 6m tall!

EDIT: I've corrected the BS stated on that page. Let's see how long until some fanboy reverts it...
Ignore him. Most of his posts are guilty of points #1 and #3.

http://sauropodomorphlair.blogspot.com/2013/09/how-to-fight-fire-with-fire-against.html
Wow that blog post is a new low for you, you take yourself and fanboys waaaaaaaaay to fucking seriously.
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