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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,111 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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| Spinodontosaurus | Jun 30 2015, 11:47 PM Post #4051 |
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Herbivore
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Based on what? |
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| Thalassophoneus | Jul 1 2015, 02:21 AM Post #4052 |
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Pelagic Killer
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From "King" of the Theropods, page 65 HERE!!!!!!!!!!!!!! New image. it needs 5 words This is also mine. it needs 5 words Edited by Thalassophoneus, Jul 1 2015, 02:24 AM.
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| DarkGricer | Jul 1 2015, 02:33 AM Post #4053 |
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Omnivore
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The first one, my picture, doesn't prove that a bipedal Spinosaurus would be bulkier then a quadrupedal one. All it does is prove that Baryonyx is bulkier then Spinosaurus. The second picture's Spinosaurus is based off Scott Hartman's Spinosaurus, which has yet to be updated to suite the new remains. Thus, you cannot use it to justify that a bipedal Spinosaurus would be bulkier. You have yet to provide any evidence. |
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| Thalassophoneus | Jul 1 2015, 02:57 AM Post #4054 |
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Pelagic Killer
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Here. I made you the favor to pick quadrupedal Spinosaurus. Spinosaurus has a slighty thinner body. However, at least this depiction, shows a wider neck and tail and don't forget the sail. And another one with biped Spinosaurus. Edited by Thalassophoneus, Jul 1 2015, 03:04 AM.
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| Spartan | Jul 1 2015, 03:26 AM Post #4055 |
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Kleptoparasite
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Lol you made Spinosaurus longer and even then its body is thinner. |
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| Thalassophoneus | Jul 1 2015, 03:32 AM Post #4056 |
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Pelagic Killer
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Were did I make Spinosaurus longer? Try downloading the picture to test it on paint. Would you mind to tell me which Spinosaurus should I choose to see if it was thinner than Baryonyx? There is a bunch of different versions of Spinosaurus. Edited by Thalassophoneus, Jul 1 2015, 03:35 AM.
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| Spartan | Jul 1 2015, 04:06 AM Post #4057 |
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Kleptoparasite
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It looks longer in the second picture. Just try to scale up Baryonyx to Spinosaurus' length and you'll see that it would be a good deal heavier by using the square cube law. |
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| Thalassophoneus | Jul 1 2015, 04:18 AM Post #4058 |
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Pelagic Killer
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Length difference in the second picture is not anything important. You can see it on paint. Square cube law? You mean this? 15/9= 1,666 1,666^3= 4,62 4,67x2,7 (weight of Baryonyx)=12,663 (possible weight of Spinosaurus) |
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| Spartan | Jul 1 2015, 05:07 AM Post #4059 |
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Kleptoparasite
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Yes, Spinosaurus is well below that. |
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| Thalassophoneus | Jul 1 2015, 05:16 AM Post #4060 |
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Pelagic Killer
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Fine. I'll do it again with Suchomimus. 15/11=1,363 1,363^3=2,533 Using lowest estimated weight for Suchomimus (2007 estimates according to Wikipedia) 2,533x2,6=6,5858 tonnes Using highest estimated weight for Suchomimus (2007 estimates according to Wikipedia) 2,533x5,2=13,1716 tonnes KEEP IN MIND THAT... New estimates published in 2014 and based on more complete specimens, supported the earlier research, finding that Spinosaurus could reach lengths greater than 15 m (49 ft). Edited by Thalassophoneus, Jul 1 2015, 05:17 AM.
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| Spartan | Jul 1 2015, 05:24 AM Post #4061 |
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Kleptoparasite
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And you keep in mind that Spinosaurus was estimated by one author of the 2014 paper to weigh 6-7 tons. It's not the monster it used to be, it's now as large as the other biggest theropods. |
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| Thalassophoneus | Jul 1 2015, 05:27 AM Post #4062 |
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Pelagic Killer
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TAKE THAT BACK!!! Do you have some copy or link with this renowned 2014 paper? You know! That paper that has given Tyrannosaurus fans the chance to brag for their loving, stereotypical JP dinosaur? |
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| Spartan | Jul 1 2015, 05:30 AM Post #4063 |
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Kleptoparasite
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Search this thread, it came out in september or so. Science doesn't care how fanboys feel. Personally I think this new reveal made Spinosaurus much more unique and interesting. |
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| Thalassophoneus | Jul 1 2015, 05:55 AM Post #4064 |
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Pelagic Killer
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http://news.nationalgeographic.com/news/2014/09/140911-spinosaurus-fossil-discovery-dinosaur-science/ The carnivore probably ate fish, ancient crocodiles, and anything else afloat. That was for all those people who say that Spinosaurus was a fish eater. "Spinosaurus could only kill tiny fish while Tyrannosaurus was searching for larger prey". It's not Spinosauru's fault if the largest animals of the era were on the land rather than in the water. I haven't found anything important regarding weight. |
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| Ceratodromeus | Jul 1 2015, 12:33 PM Post #4065 |
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Aspiring herpetologist
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Link to the paper: http://www.sciencemag.org/content/suppl/2014/09/10/science.1258750.DC1/Ibrahim.SM.pdf Simone magnuco has already expressed Spinosaurus weighed ~6-7 tons, him being the author of the paper above obviously lends credibility.
People who use this paper as some sort of denouncement of spinosaurus shouldnt be taken seriously to begin with. |
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