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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,110 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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| Thalassophoneus | Jul 1 2015, 05:03 PM Post #4066 |
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Pelagic Killer
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I couldn't see it cause I didn't know were to find it on Windows Media Center. This program isn't really helpful. "Spinosaurus was a fish eater. Tyrannosaurus could kill it easily". Yeah! Right! |
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| Ceratodromeus | Jul 1 2015, 07:09 PM Post #4067 |
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Aspiring herpetologist
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Perhaps the citation will help instead? Here: Ibrahim, Nizar, et al. "Semiaquatic adaptations in a giant predatory dinosaur." Science 345.6204 (2014): 1613-1616. |
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| theropod | Jul 1 2015, 11:27 PM Post #4068 |
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palaeontology, open source and survival enthusiast
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What does windows media center have to do with a paper? |
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| Thalassophoneus | Jul 2 2015, 12:13 AM Post #4069 |
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Pelagic Killer
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Vera sent me some short of copy of the paper and I downloaded it but it could only open with media center. |
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| retic | Jul 2 2015, 05:32 AM Post #4070 |
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snake and dinosaur enthusiast
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the depiction of spinosaurus has changed a lot since i have last posted on carnivora. i feel that if the fight takes place on land, tyrannosaurus would win, but if the fight took place in water, spinosaurus would be too maneuverable for the tyrannosaurus. |
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| DarkGricer | Jul 2 2015, 05:51 AM Post #4071 |
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Omnivore
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Yeah, that seems to be the general consensus of pretty much everyone here (With a couple of exceptions). |
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| Delude | Jul 2 2015, 10:56 AM Post #4072 |
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Unicellular Organism
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I would agree with your assessment with a single caveat; I simply can't imagine a Spinosaurus dragging a Tyrannosaurus into the deep water. In shallow water they might as well be on land and there's no reason for a Tyrannosaurus to ever venture deeper into water than it needs to be in order to get a drink. A fight like this would most likely happen near or at the water's edge, on the bank of a river or something. (Ignoring the wide geographical and time gap between them.) |
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| Frog | Jul 2 2015, 11:24 AM Post #4073 |
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Autotrophic Organism
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I'm really doubting this new spinosaurus design it's proportions seem way off for a large animal that would have spent at least some time on land it's forelimbs seem way too slender in comparison to their length to have any use on land And it's sail with a huge surface area doesn't seem at all adept for speed or stability underwater |
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| Thalassophoneus | Jul 2 2015, 06:26 PM Post #4074 |
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Pelagic Killer
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Animals that can walk both on all four and on two legs are faster on all four or no two? I think ornithopods for example were faster on two, and maybe that was also the case with quadrupedal Spinosaurus, while gorillas for example run faster on all four.
Edited by Thalassophoneus, Jul 2 2015, 06:27 PM.
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| retic | Jul 3 2015, 02:16 AM Post #4075 |
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snake and dinosaur enthusiast
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yeah, i meant deep water. in a neutral environment, i favor t.rex because of it's strength and better weaponry. |
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| Drift | Jul 4 2015, 01:33 AM Post #4076 |
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High Spined Lizard
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Agreed,Good points were just stated,retic. |
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| retic | Jul 5 2015, 03:03 AM Post #4077 |
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snake and dinosaur enthusiast
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thanks. my opinion on this match up has definitely changed since i've joined carnivora. |
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| Jinfengopteryx | Jul 6 2015, 04:13 AM Post #4078 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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So, after almost three years of participation in this thread, I finally voted for Tyrannosaurus due to the recent evidence on Spinosaurus. I really needed a bit time to think.
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| Delude | Aug 3 2015, 12:47 PM Post #4079 |
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Unicellular Organism
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I don't mean to be a pest, but can you support your position with reasoning? That way you might sway some readers to your position. |
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| bone crusher | Aug 3 2015, 02:05 PM Post #4080 |
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Heterotrophic Organism
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Posts like this wont get you very far these days, we don't talk like 9 yr old here son. All the latest evidence seem to suggest T Rex weighed a good deal more than Spino and being much taller, more powerfully built to boot. The Spino today is not the monster from JP3 nor is it a 22ton bipedal steam train from the wildest wet dream of fanboys any more. |
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