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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,359 Views) | |
| Wolf Eagle | Jan 7 2012, 02:16 AM Post #1 |
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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. ![]() 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).
Edited by Taipan, Apr 24 2015, 10:10 PM.
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| Jinfengopteryx | Sep 6 2012, 05:23 AM Post #331 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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I think it's 50/50 with a 16m Spino, I would give a 17m one an edge over a Sue sized one. A 18m one won't have too big problems and a 20m one vs T rex is a serious mismatch. |
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| theropod | Sep 6 2012, 05:49 AM Post #332 |
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palaeontology, open source and survival enthusiast
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basing on this:![]() i think a 16m one would still have an edge agaisnt sue, but it would be 50/50 if MOR was really larger (then against a ~13m long tyrannosaur) |
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| Jinfengopteryx | Sep 6 2012, 06:49 AM Post #333 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Well, the actual Spinosaurid is rather slender, it looks so big because of it's sail, also you seem to look a lot at who can outmanuver the other. Who is more likely to outmanuver the other, T rex or Spino? |
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| Drift | Sep 6 2012, 03:15 PM Post #334 |
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High Spined Lizard
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In my opinion it wasn't,With the evidence that exists we can suggest that its more difficult for Spinosaurus to take down Tyrannosaurus rather than vice versa.Until there are other Spino fossils that are found to support and prove the ridiculous 18m claims are not rubbish.I won't be able to take user's who base their argument about the winner between these two dinosaurs off of fictional lengths,seriously. |
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| SpinoInWonderland | Sep 6 2012, 03:29 PM Post #335 |
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The madness has come back...
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A 14-meter Spinosaurus is all that's needed... |
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| TheROC | Sep 6 2012, 03:45 PM Post #336 |
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Herbivore
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How is a published length fictional, pray tell? You can disagree with it, and give arguments as to why, but there can be no arbitrary handwaving. |
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| Verdugo | Sep 6 2012, 03:46 PM Post #337 |
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Large Carnivores Enthusiast
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![]() ![]() Base on these size scale, Spinosaurus doesn't have much chance of winning Edited by Verdugo, Sep 6 2012, 03:46 PM.
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| theropod | Sep 6 2012, 04:59 PM Post #338 |
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palaeontology, open source and survival enthusiast
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based on these size comparisons, t. res skull is too large, andit is no sole source to base this on! you have seen arguments why spinosaurus was likely indeed that big, so please give a Real counterargument, and not a study basing on other theropods ar a skeletal that represents one single palaeontologists opinion |
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| Verdugo | Sep 6 2012, 05:13 PM Post #339 |
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Large Carnivores Enthusiast
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That study is the best source we have, and Hartman Suchomimus doesn't have oversized head ![]() The skull of Suchomimus in this scale is ~ 1,2m and the body is ~ 11m compare to the actual size
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| theropod | Sep 6 2012, 05:25 PM Post #340 |
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palaeontology, open source and survival enthusiast
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seriously, you use the henderson study for it? have you also seen that the published lenght estimates which I trust much more at least as far as spinosaurs are concerned suggest up to 9,5m? |
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| Verdugo | Sep 6 2012, 05:52 PM Post #341 |
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Large Carnivores Enthusiast
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No you just need to look at "Skull length" column and the "Published body length" column, Henderson study is not that bad, the weight estimate is definitely biased but the length estimates base on skull length is pretty close to the Published length |
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| theropod | Sep 6 2012, 07:12 PM Post #342 |
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palaeontology, open source and survival enthusiast
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and why should I rather believe the estimates based on unrelated taxa than the published lenght? |
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| Verdugo | Sep 6 2012, 10:44 PM Post #343 |
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Large Carnivores Enthusiast
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No, you misunderstood me, the published length is without doubt more reliable than this estimate.My point is that you just need to look at the the "skull length" column and the "published length" column, this paper provides informations for Suchomimus skull length and published body length |
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| theropod | Sep 7 2012, 12:55 AM Post #344 |
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palaeontology, open source and survival enthusiast
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Oh, ok then, that was what you meant. the suchomimus in the comparison above seems to have a ~1,5m head tough |
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| Jinfengopteryx | Sep 7 2012, 01:29 AM Post #345 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Basing on that, an individual with a 1,75m skull would still be 16m long. If the skull really was 1,9-1,95m long, we get 17,3-17,8m. |
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