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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,259 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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| SpinoInWonderland | Jan 30 2013, 01:12 PM Post #1831 |
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The madness has come back...
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They may not attach parellel to spines in living animals, but for Spinosaurus, it may have had...to give extra strength to the legs and torso, it needs it, due to the laws of physics on such a massive biped...and to make fast strikes at swimming fish at the water... And the muscles aren't gonna be that much. It woule be a relatively slender structure, triangular in cross-section, which would have a mass of like 1 tonne at best... And you do realize that one of the spines you see in the image you posted is bent... |
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| Fist of the North Shrimp | Jan 30 2013, 01:16 PM Post #1832 |
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vá á orminum
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Scaling the "Angaturama" specimen of Irritaor gives pretty different results, because the skull is about 70- 80 centimeters for a 6 meter Animal. The actual Femur is about 60 centimeters. |
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| Black Ice | Jan 30 2013, 01:18 PM Post #1833 |
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Drom King
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No, they don't attach like that period for force production. Muscles positioned parallel to the spine are mainly used to keep the spine in place and prevent injuries to the disk.
This added with the previous quote, it seems unlikely. Though I'm up for a light ridge if you can explain how that would help spinosaurus control a animal as robust and powerful as T-rex. ( To set things clear before the accusation fest begins, I favor spinosaurus here purely from size)
The whole bone would bend around the center, not the tip. Edited by Black Ice, Jan 30 2013, 01:26 PM.
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| SpinoInWonderland | Jan 30 2013, 01:26 PM Post #1834 |
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The madness has come back...
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Epic quote fail. Spinosaurus: ![]() Dimetrodon: ![]() Spinosaurus' spines are not thin rods like Dimetrodon's, that's so obvious that I shoudn't even have to point it out... Edited by SpinoInWonderland, Jan 30 2013, 01:31 PM.
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| SpinoInWonderland | Jan 30 2013, 01:34 PM Post #1835 |
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The madness has come back...
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Anyway, even if Spinosaurus' spine was made of jelly, it woudn't really change the outcome by much... |
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| Black Ice | Jan 30 2013, 01:35 PM Post #1836 |
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Drom King
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EPIC MISCOMPREHENSION on your part. Both Dimetrodon AND spinosaurus spines were anchored to the skeleton. Edited by Black Ice, Jan 30 2013, 01:39 PM.
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| SpinoInWonderland | Jan 30 2013, 01:40 PM Post #1837 |
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The madness has come back...
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Why would an animal develop broad spines for a skin-like structure? It would have developed Dimetrodon-esque spines if it had a skin sail, but it didn't.... Spinosaurus just wasn't a sailback... |
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| SpinoInWonderland | Jan 30 2013, 01:42 PM Post #1838 |
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The madness has come back...
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But their shape was very different... |
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| Black Ice | Jan 30 2013, 01:43 PM Post #1839 |
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Drom King
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That wasn't the point of the quote when they were doing the dimetro spino comp.
I don't believe in a sail myself but that part is interesting. Added there's always thermoregulation, mate attracting etc. |
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| Black Ice | Jan 30 2013, 01:44 PM Post #1840 |
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Drom King
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Only if your looking at them from the same perspective....... Though as of right now, no definite answer of what the sail can be made sense there hasn't been any tissue sampling done yet. So it's all just personal preference as of now. Edited by Black Ice, Jan 30 2013, 01:48 PM.
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| SpinoInWonderland | Jan 30 2013, 01:49 PM Post #1841 |
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The madness has come back...
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Oh, okay, I was so agitated by the Spinosaurus haters on youtube that I opposed any similarites between Dimetrodon and Spinosaurus, even though they have nothing to do with what the spine looked like... An endotherm has no need for a large thermoregulation structure...Mate attraction, display, and intimidation can be done with any kind of structure the spines would have formed... Edited by SpinoInWonderland, Jan 30 2013, 01:49 PM.
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| SpinoInWonderland | Jan 30 2013, 01:50 PM Post #1842 |
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The madness has come back...
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Okay, I can do with that, but even if Spinosaurus' spine was made out of playing dough, the outcome woudn't really change by much... |
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| Black Ice | Jan 30 2013, 01:52 PM Post #1843 |
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Drom King
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I already said spinosaurus would win this...... Now had you been theropod this would have taken forever to reach the same conclusion..... Edited by Black Ice, Jan 30 2013, 01:53 PM.
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| SpinoInWonderland | Jan 30 2013, 01:56 PM Post #1844 |
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The madness has come back...
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I know you already said Spinosaurus would win, I just said that to tell others...and you made it seem as if theropod was a really stubborn guy
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| Black Ice | Jan 30 2013, 01:58 PM Post #1845 |
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Drom King
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I'm sure you've seen how he acts when I questioned a muscular ridge ![]() Compare his reaction to your more subtle one and you'd see my point. |
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