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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,311 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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| Fragillimus335 | Dec 23 2012, 11:53 AM Post #1051 |
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Omnivore
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Nope! Well, not me at least!
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| SpinoInWonderland | Dec 23 2012, 02:23 PM Post #1052 |
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The madness has come back...
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Among the ones that are quite kknowledgeable on large theropods, no, Spinosaurus would win, accept it or live in denial |
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| SpinoInWonderland | Dec 23 2012, 02:25 PM Post #1053 |
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The madness has come back...
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The evidence is the proportions of related spinosaurids, they all follow a head:body ratio close to or at 1:10 |
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| SpinoInWonderland | Dec 23 2012, 02:47 PM Post #1054 |
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The madness has come back...
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You know something dinosaur, We're just realizing the facts and drawing the logical conclusion... |
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| SpinoInWonderland | Dec 23 2012, 02:51 PM Post #1055 |
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The madness has come back...
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So much facepalm... Spinosaurus is so much larger than Tyrannnosaurus, that it's size advantage is more than enough to counter Tyrannosaurus' bite And Spinosaurus' jaws are NOT weak |
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| bone crusher | Dec 23 2012, 05:38 PM Post #1056 |
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Heterotrophic Organism
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Sue at 9.5 tons should stand a decent chance of dueling a 12 tons Spino. The is one fight that doesn't have a clear outcome unless more Spino's remain are found and size De-mystified. I give it 50/50. But if we're using a theoretical 17-18m long spino at 18 tons then we have to also use the UCMP137538 rex at 16.5 tons. |
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| SpinoInWonderland | Dec 23 2012, 05:44 PM Post #1057 |
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The madness has come back...
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Sue was not 9.5 tonnes, a 9.5-tonne Tyrannosaurus would be about ~14 meters long UCMP 137538 is not a Tyrannosaurus, it's bone doesn't resemble any Tyrannosaurus toe bone, check it yourself |
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| bone crusher | Dec 23 2012, 06:14 PM Post #1058 |
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Heterotrophic Organism
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Hehe I think I'll trust scientist with the latest method and knowledge than yours broly. |
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| SpinoInWonderland | Dec 23 2012, 06:17 PM Post #1059 |
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The madness has come back...
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Most estimates for Tyrannosaurus are centered around 6 tonnes and those estimates were made by researchers and such... |
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| SpinoInWonderland | Dec 23 2012, 06:18 PM Post #1060 |
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The madness has come back...
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If you use the liberal estimate for Tyrannosaurus, you must also use liberals for other dinosaurs, otherwise it's bias |
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| bone crusher | Dec 23 2012, 06:24 PM Post #1061 |
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Heterotrophic Organism
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Most estimates are from one or two people with very dated methods, the rest just copy and paste the wrong data. Researchers constantly refresh their data when new analysis and studies are published, get in with time man. |
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| bone crusher | Dec 23 2012, 06:26 PM Post #1062 |
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Heterotrophic Organism
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You are dumb beyond comprehension, not all dinosaurs receive a free weight gain coz everything is proportion based. This is why the method is so much more accurate. How many times do I have to repeat myself? |
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| SpinoInWonderland | Dec 23 2012, 07:29 PM Post #1063 |
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The madness has come back...
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Obviously you are biased towards Tyrannosaurus So you would compare a conservative 10-tonne Diplodocus to a liberal 9.5-tonne Tyrannosaurus, despite the size difference? |
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| bone crusher | Dec 23 2012, 07:47 PM Post #1064 |
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Heterotrophic Organism
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If they 3d scanned the Diplodocus maybe it will gain some or loose some weight, nobody knows. |
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| theropod | Dec 23 2012, 08:45 PM Post #1065 |
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palaeontology, open source and survival enthusiast
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And why then do people like Paul and Brochu disagree with your totally up to date estimate? Can you explain to me why it is mainly the 9,5t estimate that is copied and pasted by everybody, ignoring the existence of other estimates? Can you explain to me why you think we should use the highest estimate for T. rex and just the normal ones for all the others? Because so far you haven´t given proper reasons to presume we should make jsut T. rex much heavier and at the same time use lower end estimates for any other animal. |
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Well, not me at least!
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