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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,327 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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| Fragillimus335 | Oct 24 2012, 10:03 AM Post #811 |
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Omnivore
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Agree 100%!!! |
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| theropod | Oct 24 2012, 09:46 PM Post #812 |
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palaeontology, open source and survival enthusiast
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That is a really good signature fragillimus. But why an 11m T. rex? |
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| Archer250 | Oct 24 2012, 10:10 PM Post #813 |
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Autotrophic Organism
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Because I don't think so many T-Rexes lived to Sue's size.
Edited by Archer250, Oct 24 2012, 10:10 PM.
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| Verdugo | Oct 24 2012, 10:56 PM Post #814 |
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Large Carnivores Enthusiast
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Yes, me, Grey, Gecko, Hone, Cau,... don't believe it while you and Fragillimus are the only one believe it
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| Fragillimus335 | Oct 24 2012, 11:11 PM Post #815 |
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Omnivore
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Don't forget the actual scientist who described the material.....Dal Sasso..... |
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| SpinoInWonderland | Oct 24 2012, 11:14 PM Post #816 |
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The madness has come back...
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And the guys who made Planet Dinosaur... |
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| theropod | Oct 25 2012, 12:31 AM Post #817 |
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palaeontology, open source and survival enthusiast
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me, fragillimus, Dal Sasso, Mickey Mortimer, Tom Holtz (his spinosaurus is 16m, I´m saying it is 16m or more)... The only ones And the difference is, we are giving actual logic instead of just "too much" "exagerated" "unlikely", all basing only on the consideration "spinosaurus must have had a proportionally much larger head" |
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| Verdugo | Oct 25 2012, 05:02 AM Post #818 |
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Large Carnivores Enthusiast
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I remember Cau did make some estimates about Spinosaurus size, i will post it later |
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| 7Alx | Oct 25 2012, 05:08 AM Post #819 |
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Herbivore
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I believe in Dal Sasso length estimates, but.... low and average (16-17 m) Edited by 7Alx, Oct 25 2012, 05:15 AM.
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| genao87 | Oct 27 2012, 06:23 AM Post #820 |
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Heterotrophic Organism
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he made some about Spino being 10/11 tons or so but with much shorter legs. however i dispute the height of the legs. |
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| Grey | Oct 27 2012, 07:29 AM Post #821 |
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Kleptoparasite
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The short-legged view will be maybe confirmed by Dal Sasso... And Dal Sasso supports the 16-17 m estimation for Spinosaurus. |
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| Black Ice | Oct 27 2012, 07:49 AM Post #822 |
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Drom King
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Well if the shorter legged 16 to 17 meter estimate is true, then spinosaurus has a better chance than i thought. Wasn't it universally agreed that spinosaurus was most likely only around 14 or 15 meters though? |
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| genao87 | Oct 27 2012, 12:07 PM Post #823 |
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Heterotrophic Organism
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how do you figure it had a better chance if it had shorter legs? it was not universally agreed on the length from my understanding. |
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| Black Ice | Oct 27 2012, 12:32 PM Post #824 |
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Drom King
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It's complicated, but it has to do with its center of gravity. |
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| Jinfengopteryx | Oct 27 2012, 05:29 PM Post #825 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Balance, right? |
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