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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,193 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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| Megalosauroid | Nov 22 2013, 10:52 PM Post #2821 |
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Autotrophic Organism
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Thev tail is restored differently, but we must not take seriously the estimates based on fragmentary specimens. I Heard estimates for Giganotosaurus from old books and they round 13-14 m, It was just the tail length that changed but because we have an almost 70% complete skeleton. Using Baryonyx or Suchomimus to get a size estimate for Spinosaurus would be like using Albertosaurus and Gorgosaurus to get a size estimate for Tyrannosaurus, I hope we will find a skeleton of an irritator son. |
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| Megalosauroid | Nov 22 2013, 10:53 PM Post #2822 |
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Autotrophic Organism
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Thev tail is restored differently, but we must not take seriously the estimates based on fragmentary specimens. I Heard estimates for Giganotosaurus from old books and they round 13-14 m, It was just the tail length that changed but because we have an almost 70% complete skeleton. Using Baryonyx or Suchomimus to get a size estimate for Spinosaurus would be like using Albertosaurus and Gorgosaurus to get a size estimate for Tyrannosaurus, I hope we will find a skeleton of an irritator son. |
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| Megalosauroid | Nov 22 2013, 10:57 PM Post #2823 |
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Autotrophic Organism
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So, why is Hartman using the proportions of Baryonychinae spinosaurids if they were so different from Spinosaurus? it is like estimating the body size of a frgamentary T.rex with Albertosaurus or Gorgosaurus... |
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| Megalosauroid | Nov 22 2013, 10:58 PM Post #2824 |
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Autotrophic Organism
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Yes, I am Megalosaurid |
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| Jinfengopteryx | Nov 22 2013, 11:26 PM Post #2825 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Because only they are known from complete enough remains. After all, the great white is also used as a basis for Megalodon, despite the fact that the differences there are even far greater than here. Of course a close relative of Spinosaurus would be better, but even then we'd have great uncertainty. This is the reason why we give estimate ranges. @Spinodontosaurus, thanks for the correction! Edited by Jinfengopteryx, Nov 22 2013, 11:28 PM.
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| Vobby | Nov 23 2013, 01:04 AM Post #2826 |
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Omnivore
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Thanks blaze! I'll try and see how long is Tyrannosaurus's torso now. |
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| blaze | Nov 23 2013, 02:12 AM Post #2827 |
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Carnivore
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@Megalosauroid I do speak Spanish, I'm from mexico. @Vobby You're welcome
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| Drift | Nov 23 2013, 11:49 PM Post #2828 |
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High Spined Lizard
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Agreed, for too long a lack of evidence has given me a migraine due to asinine assumptions of its total length |
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| Megalosauroid | Nov 24 2013, 01:46 AM Post #2829 |
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Autotrophic Organism
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Great I am from México too. |
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| blaze | Nov 24 2013, 03:24 AM Post #2830 |
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Carnivore
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Nice! haha |
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| Vobby | Nov 29 2013, 07:45 PM Post #2831 |
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Omnivore
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Just so you know, Cau udated his old post in which he compared the relative mass and robustness of Tyrannosaurus and Spinosaurus: http://theropoda.blogspot.it/ |
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| retic | Dec 2 2013, 07:18 AM Post #2832 |
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snake and dinosaur enthusiast
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my opinion on this match has chanced a bit since i first came to carnivora. i still think spinosaurus will win more often then not, but i now think it is much closer. if we use the largest specimens for each species, then i think spino will win roughly 65% of the time. however, if we use different specimens the results may differ. IPHG 1912 VS FMNH PR2081: t.rex wins 80% MSMN V4O47 VS FMNH PR2081: spinosaurus wins 65% IPHG 1912 VS AMNH 5027: t.rex wins 60% MSMN V4O47 VS AMNH 5027: spinosaurus wins 80% IPHG 1912 VS BH1 3033: spinosaurus wins 70% MSMN V4O47 VS BH1 3033: spinosaurus wins 90% |
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| Sci Fyena | Dec 3 2013, 03:35 PM Post #2833 |
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Heterotrophic Organism
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Just watch Jurassic Park to see what would REALLY happen. Because that movie is accurate. |
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| Jinfengopteryx | Dec 4 2013, 12:40 AM Post #2834 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Are you serious? This movie is not even meant to be accurate. By the way, we all know what would happen if Tyrannosaurus caught the neck of Spinosaurus and pressed it down at the ground.
Edited by Jinfengopteryx, Dec 4 2013, 12:44 AM.
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| spinosaurus rex | Dec 4 2013, 05:19 AM Post #2835 |
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Carnivore
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the movie is no where near as accurate as what would really happen. first, both the t-rex and spinosaurus were down sized, spinosaurus couldn't articulate its wrists to grab a t-rex, spinosaurus couldn't break a t-rex neck like that, and if the t-rex ever manage to bite a spinosaurus and pin it to the ground( if it could, looks like its at a disadvantage at that arena), it is the combination of a 6 ton bite force and 14-15 tons of dinosaur landing on the ground that will kill it. |
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