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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,360 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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Gecko
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Maybe we should use Horner's C-rex or UCMP 137538 for Tyrannosaurus because they hold just as much weight as a 2 m Spinosaurus skull does...
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Verdugo
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theropod
Sep 5 2012, 06:10 AM
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Spinosaurus aegyptiacus: 18m
Tyrannosaurus rex: 12,3m

this should put an end to this debate

PS: And YES, this T. rex head is oversized, much more than other theropods skulls would be when scaled to correct body lenght.
now if you tell me spinos head was also too large: ok, but it´s not as much too large as that of T. rex, so it would end up larger compared to it actually, and2m spinosaurus skull is actually not unlikely, at least far far far more likely than a T. rex skull that size. as you see, T. rex measurements are made as long as possible...

Spinosaurus is not as big as 18m, you just favour Spinosaurus in term of size, not to mention Spino's legs are way too long. Yes, i know you are not Spino fanboy, you are not T rex hater either but can you please just STOP overestimate Spinosaurus size. If Spino is really 18m long, the weight base on cube law would be far toooo great for a bipedal, which is extremely unlikely. And Irritator has a skull and body ratio 1/10 so Spinosaurus MUST have the ratio higher than that, because larger Theropod has LARGER head relative to its body than its smaller cousin. Spinosaurus ~ 14-15m sounds much much much much more reasonable than the 18m version
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Fragillimus335
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Just because you think an 18 meter Spinosaurus was too heavy to be bipedal doesn't mean it was. What about all the bipedal ornithischians in the 15-25 ton range?
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SpinoInWonderland
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A 17-meter Spinosaurus isn't too heavy at 11 tonnes...
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Verdugo
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brolyeuphyfusion
Sep 5 2012, 03:25 PM
A 17-meter Spinosaurus isn't too heavy at 11 tonnes...
A 17m Spinosaurus is acutally 14 tons, base on 11m 3,8 tons Suchomimus (using cube law)
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Fragillimus335
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And an 18 meter one is about 17 tons, which is perfectly possible for bipedal animals.
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Jinfengopteryx
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Verdugo
Sep 5 2012, 08:13 PM
brolyeuphyfusion
Sep 5 2012, 03:25 PM
A 17-meter Spinosaurus isn't too heavy at 11 tonnes...
A 17m Spinosaurus is acutally 14 tons, base on 11m 3,8 tons Suchomimus (using cube law)
I think less than 15t are still possible.
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theropod
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I´m sceptical about 3,8t for suchomimus, but assuming it was 3t spinosaurus would still have massed more than 13t at 18m, and this is whithout taking into account that it was far more robust, and that huge crest on its back...
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Verdugo
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Jinfengopteryx
Sep 6 2012, 01:27 AM
Verdugo
Sep 5 2012, 08:13 PM
brolyeuphyfusion
Sep 5 2012, 03:25 PM
A 17-meter Spinosaurus isn't too heavy at 11 tonnes...
A 17m Spinosaurus is acutally 14 tons, base on 11m 3,8 tons Suchomimus (using cube law)
I think less than 15t are still possible.
Yes, but it's very EXTREME (i've explained all) but Spino would probably heavier than Suchomimus at the same size due to its hump
Hey, why don't anyone ask Scott Hartman whether his Spino reconstruction has large head, i don't see anyone on devianart mention that  :-/
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theropod
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Not very extreme imo. When suchomimus would already yield 13t with the same proportions...
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TheROC
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I have no problem with Spinosaurus only being 10 tons or so at 18 meters.

So long as conditionally, all other theropod weights are also downshifted.

Seeing as Suchomimus is an animal on par with Tarbosaurus in size, and would have been comparable in weight.

Basically, everything needs to be kept in proportion to make sense.
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Fragillimus335
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TheROC
Sep 6 2012, 02:20 AM
I have no problem with Spinosaurus only being 10 tons or so at 18 meters.

So long as conditionally, all other theropod weights are also downshifted.

Seeing as Suchomimus is an animal on par with Tarbosaurus in size, and would have been comparable in weight.

Basically, everything needs to be kept in proportion to make sense.
I agree, the real trouble is finding out just how big the air sac system was in large theropods. Although Spinosaurus would likely have less than Tyrannosaurus.
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Drift
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Claim's that an 18 meter Spinosaurus is the only thing keeping this discussion alive, Other than that the victor is this fight is very clear.
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Fragillimus335
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A 16 meter Spinosaurus would still crush a Tyrannosaurus.
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theropod
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Drift
Sep 6 2012, 03:15 AM
Claim's that an 18 meter Spinosaurus is the only thing keeping this discussion alive, Other than that the victor is this fight is very clear.
That was pretty tyrannosaur biased. even a 16m spinosaurus would be too large based on fragillimus comparison
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