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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,368 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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| Black Ice | Aug 24 2012, 01:13 AM Post #196 |
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Drom King
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The reason I said t rex would win is because of several things 1. Spinosaurus had claws and usable arms, but they were short, not even as long as allosaurus limbs. So how would it use them? 2. If you see a spinosaurid and tyrannosaurid skeleton at the same size, the spiny is very gracile compared to a tyrannosaur 3. Spino may be bigger, but due to its gracile build when compared to a tyrannosaur, I doubt its significantly stronger, if at all. ![]() 4. Tyrannosaurus was the more robust,durable, and more powerful specimen, that counters spinos size adv. I just don't see how spino could effectively hurt the tyrannosaur. Edited by Black Ice, Aug 24 2012, 01:19 AM.
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| theropod | Aug 24 2012, 01:20 AM Post #197 |
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palaeontology, open source and survival enthusiast
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1. Why should they be short? we haven´t found them, but seeing it´s relatives had downright huge arms for theropod standarts (even longer than allosaurs, which already have extremely impressive forelimbs), with enlarged claws that certainly serves some purpose, I doubt that spinosaurus arms wouldn´t be a significant factor. 2. First of all, what we have of spino is significantly bulkier than baryonyx or suchomimus, also it has a massive muscular crest and it is twice the weight of T. rex. 3. 12t spino will be much strogner than 6t T. rex, believe it or not, even more so due to it´s more massive built and huge muscle attachment area on the back 4. T. rex might be a bit bulkier and stronger at parity, but that won´t help it compared to a 12t+ animal with huge claws, a decent bite force, strong muscular body... I can see the spinosaur killing Rexy in a variety of ways. it could bite the troat or the neck, it could violently slash at it with its claws, it couls ude it´s size and strong arms to overpower and crush it with it´s feet... |
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| theropod | Aug 24 2012, 01:21 AM Post #198 |
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palaeontology, open source and survival enthusiast
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Keep in mind that the comparison shown above does by no means show spinos max size, as far as I know this is just a 14m spinosaurus. That skeletal isn´t compatible with the CL/TL ratio of relatives like Baryonyx.
Edited by theropod, Aug 24 2012, 01:22 AM.
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| Black Ice | Aug 24 2012, 01:22 AM Post #199 |
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Drom King
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Look at is forelimbs, and take away the sail.![]() Without the sail, it looks nowhere near impressive or bulky. Also it was made by prehistoric cat. Edited by Black Ice, Aug 24 2012, 01:23 AM.
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| Black Ice | Aug 24 2012, 01:26 AM Post #200 |
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Drom King
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This is between charchy and a average and max spino, a good reference, take away the sail and look at the claws, not impressive![]() 13 meter carcharodontosaurus vs 14 meter holotype spinosaurus (which is what Scott Hartman was showing), and scaling it up to show an 18 meter one as well. |
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| SpinoInWonderland | Aug 24 2012, 01:28 AM Post #201 |
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The madness has come back...
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As for Prehistoric cat's size comparison, that's a conservative estimate, Prehistoric Cat always goes by conservative estimates for some reason, 17 meters is more like it. Plus the sail seems like a good attachment place for a load of muscles, giving it immense strength for it's size
Edited by SpinoInWonderland, Aug 24 2012, 01:29 AM.
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| Black Ice | Aug 24 2012, 01:29 AM Post #202 |
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Drom King
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Prehistoric cat made the pic, and is their any evidence for extra muscle in the sail? Looks like more of a camel hump analogy to store extra fat etc. during drought, as it did live in egypt. |
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| SpinoInWonderland | Aug 24 2012, 01:32 AM Post #203 |
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The madness has come back...
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The fact that a camel-like hump would make it too heavy to be possible for a bipedal animal, makes an Acrocanthosaurus-like muscular sail more likely. And Egypt in the Cretaceous was much wetter than what it was today |
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| Black Ice | Aug 24 2012, 01:36 AM Post #204 |
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Drom King
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Well acrocanthosaurus ridge was much shorter and thicker, while spinos was very tall and thin, thus I doubt it was for muscles. Plus acro wasn't a spinosaur, it was a charcharadontosaurid. Edited by Black Ice, Aug 24 2012, 01:38 AM.
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| theropod | Aug 24 2012, 03:52 AM Post #205 |
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palaeontology, open source and survival enthusiast
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Suchomimus has somethign similar, the spines are too broad to be a sail, and a hump would require even stronger ones. all that remains is some sort of muscular crest. Also, most of the body is speculative, it could jsut as well be bulkier. don´t use prehistoric cat´s scale here, it is in disagreement with the ratio of it´s closest relatives we have data on, so just speculation. |
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| Black Ice | Aug 24 2012, 03:56 AM Post #206 |
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Drom King
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So you favor the spinosaurid? |
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| Jinfengopteryx | Aug 24 2012, 04:41 AM Post #207 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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He does. |
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| Carcharadon | Aug 24 2012, 10:59 AM Post #208 |
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Shark Toothed Reptile
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T.rex has a huge bite force advantage As it was faster, more intelligent, and much more advanced. |
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| Superpredator | Aug 24 2012, 11:52 AM Post #209 |
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Apex Predator
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Size, weight, power and arms > Bite-force and agility. |
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| Black Ice | Aug 24 2012, 12:00 PM Post #210 |
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Drom King
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I already addressed that superpredator. |
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