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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,220 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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| Ausar | Apr 12 2013, 08:56 AM Post #2416 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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Can you prove Carcharodontosaurus, Bahariasaurus, Deltadromeus, and Sauroniops were not as formidable to Spinosaurus than T.rex is to each other in intraspecific conflict? Experience in interspecific conflict>experience in intraspecific conflict especially if the rivals from the former are formidable ones. Why? If you are only fighting individuals from the same species, they practically have the same attributes as you do, thus it's sort of predictable on who's going to win. If you're fighting individuals of a different species, their attributes could be a new challenge for you. Sorry if I'm talking like we're playing PĂłkemon, but all I'm saying is that Spinosaurus has faced formidable theropods when it was still extant. On the other hand, assuming Nanotyrannus (a close relative of Tyrannosaurus) really was somewhere like 30 feet long, it was one of if not the only interspecific rival Tyrannosaurus had. Edited by Ausar, Apr 13 2013, 05:15 AM.
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| theropod | Apr 12 2013, 06:24 PM Post #2417 |
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palaeontology, open source and survival enthusiast
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What short arms? You do realise they simply are not short? Have you seen some shots showing the robusticity of spinosaurid arms?
Not on their own, I never stated so, but all it takes is to topple the opponent over. The arms alone don't even have to do damage as long as they fulfill their function.
the arms of spinosaurus could easily have been just as long when compared to its lenght This is absolutely a factor, because if T. rex falls, its over. And yes, T. rex could with a fair amount of likeliness have made a bipedal less than half its own weight topple over using its arms, given it could reach it, which of course is the critical point. Spinosaurus reaching T. rex however would not be problematic at all, because it had proportionally much longer (not to mention far stronger) arms. The horrible comparison is not what I'm making, its what you are making. |
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| Monitor X | Apr 13 2013, 05:07 AM Post #2418 |
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Autotrophic Organism
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Yes Spinos arms were big, strong, able to crush a car flank and bla and bla...yet we've never seen its arms Perhaps its arms were not adequately positionned and only able to slam toward the ground, as the big fisher it was.
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| theropod | Apr 13 2013, 05:29 AM Post #2419 |
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palaeontology, open source and survival enthusiast
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Veery funny, really I suppose the equivalent in ridiculing T. rex (ignoring the fact that there are really some fanboys around who would do this in all seriousness) would be to compare its jaws to a nuclear bomb... We have see the arms of several other spinosaurs and they all are large and massively constructed. if you doubt that, bring up evidence. For all we know they were positioned just fine for being used in this fight. |
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| Kurtz | Apr 13 2013, 05:32 AM Post #2420 |
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Kleptoparasite
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not a nuclear bomb, but the jaws of spino vs t rex.... t rex all the time! T Rex take this no contest |
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| theropod | Apr 13 2013, 05:45 AM Post #2421 |
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palaeontology, open source and survival enthusiast
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I tought according to you T. rex was "a slow, lumbering scavenger, unable to hunt large prey"? |
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| Monitor X | Apr 13 2013, 05:45 AM Post #2422 |
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Autotrophic Organism
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No, it's you who have to bring evidence that Spino, or any theropod with "large" arms, could use it efficiently in a frontal assault. The contrary is not true for Tyrex jaws, there's no need of stupid analogies with a nuclear bomb for demonstrate the lethal potency of his bite. |
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| SpinoInWonderland | Apr 13 2013, 10:58 PM Post #2423 |
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The madness has come back...
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Again, more nonsense, the jaws are only PART of the factors, there are other factors as well. I hate that "jaws = auto win" line of thought. You once said that Tyrannosaurus was a slow scavenger that was unable to hunt. Now you think that it can easily destroy a creature that is larger than it. And I'm only gonna say this once, it's T. rex, NOT T Rex, you hypocrite. |
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| Jinfengopteryx | Apr 14 2013, 12:21 AM Post #2424 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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There ar emany ways how you can call it. The correct name is T. rex, as in species names, the Genus name can be abbreviated like that, but things like T-rex are valid nicknames. |
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| Spinodontosaurus | Apr 14 2013, 03:35 AM Post #2425 |
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Herbivore
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'T-rex' is just a miss-spelling of the Jurassic Park inspired nickname T. rex. |
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| MightyMaus | Apr 14 2013, 06:23 AM Post #2426 |
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Autotrophic Organism
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It is a fantastic comparison. And you may note the word "generally" in my original post. And your refuting of my statement does nothing but prove my line of thought. Otters, like Spinosaurus, were generally piscivores, but they occasionally took surprisingly massive prey. |
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| Ausar | Apr 14 2013, 07:04 AM Post #2427 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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Even then some of those fish were pretty formidable. Some prey could have included large coelacanths (Mawsonia), sawfish (Onchopristis), and probably even sharks. Edited by Ausar, Apr 14 2013, 07:14 AM.
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| Jinfengopteryx | Apr 14 2013, 11:57 PM Post #2428 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Please remember that for Spinosaurus, this is an assumption. |
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| MightyMaus | Apr 15 2013, 03:51 AM Post #2429 |
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Autotrophic Organism
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I know it is an assumption, but look at cheetahs. They are not very well adapted for taking down prey larger than themselves, but if they weighed 1.5 tons, I have no doubt they would be eating buffalo left and right. Just as Spinosaurus, weighing 12-16 tons, would likely not blink an eye at taking down a 10 ton herbivore. |
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| Jinfengopteryx | Apr 15 2013, 05:40 AM Post #2430 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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I don't know if it would need to do so. We now know that Spinosaurus spent most of it's day in the water ( http://geology.gsapubs.org/content/38/2/139.abstract ) and very likely also hunted there. It may only came out of the water to sleep, rest or to look if it's territory borders are safe. |
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Perhaps its arms were not adequately positionned and only able to slam toward the ground, as the big fisher it was.


2:23 AM Jul 14