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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,366 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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| Megafelis Fatalis | Aug 26 2012, 03:26 AM Post #226 |
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Carnivore
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Source ? If Spinosaurus was 18 tons, it would be more than 22m long !! There is ZERO Evidence about that !! Spinosaurus wasn't the largest Theropod, the title belong to one of three, Giganotosaurus - Tyrannosaurus - Carhcarodontosaurs |
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| DinosaurMichael | Aug 26 2012, 03:28 AM Post #227 |
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Apex Predator
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Don't have the source, but ask TheROC by PMing him. There's no doubt there's a possiblity that Spinosaurus would've been the big at max sizes. TheROC's a very intelligent user. Also it's confirmed that Spinosaurus is the largest Theropod and the largest land Carnivore that ever lived. At max weights. It could of gotten to 60 feet or more. Edited by DinosaurMichael, Aug 26 2012, 03:33 AM.
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| Megafelis Fatalis | Aug 26 2012, 03:33 AM Post #228 |
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Carnivore
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He debated with someone on Deviantart, and he said at last "Until an official peer-reviewed study that contradicts the Dal Sasso estimates are brought forth, the estimates stand" |
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| DinosaurMichael | Aug 26 2012, 03:35 AM Post #229 |
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Apex Predator
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Still there's doubt Spinosaurus is the largest Theropod and Land Carnivore. The OP says so. |
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| SpinoInWonderland | Aug 26 2012, 03:40 AM Post #230 |
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The madness has come back...
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there is no use continuing that argument, Prehistoric Cat will always use conservative estimates for any non-tyrannosaurid theropod, no matter what...he is biased, believe me, he even thinks that sauropods are defenseless! |
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| DinosaurMichael | Aug 26 2012, 03:41 AM Post #231 |
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Apex Predator
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I know that. About the fact he thinks Sauropods are defenseless. If they were. They probably wouldn't have evolved, or became extinct right away, when they lived for millions of years. |
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| 7Alx | Aug 26 2012, 04:27 AM Post #232 |
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Herbivore
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More than 60 ft? I don't think so. Even based on Baryonyx skull, Spinosaurus specimen MSNM V4047 was more like ~17 m (55 ft) in length. There is not longer skull than 1.75 m and there is not larger specimen than MSNM V4047. 18-21 m (60-70 ft) and 2 m skull are centairly oversized. Edited by 7Alx, Aug 26 2012, 04:28 AM.
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| DinosaurMichael | Aug 26 2012, 04:29 AM Post #233 |
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Apex Predator
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I wouldn't be surprise if it were at least 60 feet long at max. I know on average it wouldn't be that long. Edited by DinosaurMichael, Aug 26 2012, 04:38 AM.
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| theropod | Aug 26 2012, 04:35 AM Post #234 |
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palaeontology, open source and survival enthusiast
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But you appearantly think bite force is everything. This fight just isn´t fair at max size. Spinosaurus will be double the weight of T. rex, that´s just a fact. scaling the specimen Dal Sasso estimated at baryonyx proportions, we get 17,5m, and it is more likely that spinosaurus´ more robust, massive skull was proportionally shorter, 18m isn´t that unlikely. now for the weight: I don´t think there are any serious, recent estimates lower than 11t. when we use suchomimus we already get 13t, and it was much more slender and didn´t have a larger crest on it´s back. Also that picture you can see on top of the dinosaur section is terribly inaccurate (I know there´s no need to tell that to the ones who have knowledge about dinosaurs). the alrgest T. rex skulls are 1,4m, maybe 1,5m (MOR 008, butn that wa smost liekly a wrong reconstruction or a confusion of skull and mandible lenght just like in sue). the skull of spinosaurus was 1,75m long. |
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| 7Alx | Aug 26 2012, 04:36 AM Post #235 |
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Herbivore
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@Dino Mike If paleontologists will find larger specimen than MSNM V4047... Ps. Other specimens who are found would be around 14 m in length, although ~14 m the holotype was described as subadult (however these bones are destroyed, so there is not newer research about this specimen), but second MNHN SAM 124 is estimating to be in almost the same size was adult. Edited by 7Alx, Aug 26 2012, 04:38 AM.
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| Megafelis Fatalis | Aug 26 2012, 04:39 AM Post #236 |
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Carnivore
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You always repeat that, but you never give an evidence !! |
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| DinosaurMichael | Aug 26 2012, 04:40 AM Post #237 |
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Apex Predator
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True, 7Alx. Also for all we know there could of been freak specimens that exceeded to more than 60 feet like maybe 65-70 feet long, but like I said. That would have to be a freak specimens. We'll just have to wait and see though. Edited by DinosaurMichael, Aug 26 2012, 04:47 AM.
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| 7Alx | Aug 26 2012, 04:47 AM Post #238 |
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Herbivore
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There might be, but it doesn't mean there must be. Although honestly it isn't ruled. |
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| DinosaurMichael | Aug 26 2012, 04:47 AM Post #239 |
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Apex Predator
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Yes, indeed. Anything can be possible for all we know anyway. Edited by DinosaurMichael, Aug 26 2012, 04:49 AM.
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| Jinfengopteryx | Aug 26 2012, 05:20 AM Post #240 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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I've did some calculations based on MNHN SAM 124 and I got 17,35m and ~13t, for the 1,75m Individual. |
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