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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,332 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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| Grey | Oct 7 2012, 07:25 PM Post #736 |
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Kleptoparasite
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I don't like fanboys but it is normal to have specific likings for one or several types of animals. I don't become some ridiculous hater when I confront someone who not share my views. By the way, the F-boy became the easiest and most pathetic counter-argumentation. So no, a fanboy is still better than a hater. But justly, many haters are fanboys as well. Edited by Grey, Oct 7 2012, 07:26 PM.
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| theropod | Oct 7 2012, 07:27 PM Post #737 |
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palaeontology, open source and survival enthusiast
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as I wrote, every fanboy is a hater as well, because fanboys naturally think "their animal" was by far "better" than every other animal |
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| Grey | Oct 7 2012, 07:30 PM Post #738 |
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Kleptoparasite
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No, a fanboy is not necessary a hater as well, he just likes and hype his favorite beast more than others, he does not necessarily hate another(s) animal(s). Edited by Grey, Oct 7 2012, 07:31 PM.
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| Verdugo | Oct 7 2012, 08:39 PM Post #739 |
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Large Carnivores Enthusiast
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I doubt that Spinosaurus femur and tibia would be just scaled up like that based on Suchomimus, larger animal usually has shorter legs than their smaller relative and due to being non-arctometatarsal, like Cau stated, Spinosaurus would have proportionately shorter leg than T rex. But i agree that Spinosaurus would be taller than T rex, but not by much About Spinosaurus having bigger bite than T rex: I highly doubt about that ![]() ^ That is MSNM V4047 rostrum compare to a human(Andrea Cau) head from a different angle. The MSNM V4047 rostrum is certainly very long, almost 1m in length, but it's actually EXTREMELY narrow if you look at it from a different angle |
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| Grey | Oct 7 2012, 09:20 PM Post #740 |
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Kleptoparasite
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From this viewpoint, it's true that Spinosaurus snout lacks of "badassness", despite my interest for it. Nice pic Verdugo (RE4 player I guess). Edited by Grey, Oct 7 2012, 09:38 PM.
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| SpinoInWonderland | Oct 7 2012, 09:52 PM Post #741 |
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The madness has come back...
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Spinosaurus won't be using it's bite to kill though...so even if Spinosaurus had the bite force of a human(which is impossibly low for an 11-tonne theropod), it would still win |
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| Carcharadon | Oct 7 2012, 09:54 PM Post #742 |
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Shark Toothed Reptile
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Being a hater is worse than being a fanboy, because there is no good reason to hate any animal. |
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| Gecko | Oct 8 2012, 01:01 AM Post #743 |
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Autotrophic Organism
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How is that cherry picking? I can show you six more pictures and the results will be the same... Tyrannosaurs are physically more impressive looking than Spinosaurs (Not counting the arms of course)
Sue's skeleton alone weight almost 2 tons. The new weight estimates (the laser scanned skeletons one) give Sue a minimum weight of 10 tons. The Field Museum says Sue is "more than 7 tons ". @Verdugo nice find. Here's the Tyrannosaurus holotype skull in a similar pose.
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| Fragillimus335 | Oct 8 2012, 01:11 AM Post #744 |
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Omnivore
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Spinosaurus was, at a very conservative 12 tons, more than 12,000 pounds heavier than Tyrannosaurus, that makes it far more massive/strong. Also Spinosaurs likely had stronger bites than Carcharodontosaurs. Spinosaurus is estimated to have a bite between 2-3 tons while rex is 3-6 tons. Also, scaling from such does make Spinosaurus much taller than Tyrannosaurus. The short legged Spinosaurus is a myth repeated by Tyrannosaurus lovers. And of course, Spinosaurus has a much longer skull than T-rex, suit stands to reason that it probably had a much larger gape. |
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| Verdugo | Oct 8 2012, 01:18 AM Post #745 |
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Large Carnivores Enthusiast
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Really nice pic, Gecko . Now it is getting VERY ridiculous for Sue to weigh less than 7 tonnes. Dave Hone suggested Sue would weigh 9 tonnes, the new estimate gives Sue up to 9,5 tonnes.
Edited by Verdugo, Oct 8 2012, 01:18 AM.
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| Fragillimus335 | Oct 8 2012, 01:24 AM Post #746 |
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Omnivore
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A 9 ton Sue is ridiculous. It was nowhere near that fat. I've seen the skeleton in person, and my college professor, (Christopher Brochu) helped describe Sue, and he thinks it weighed 6-7 tons... MAX. |
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| theropod | Oct 8 2012, 01:35 AM Post #747 |
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palaeontology, open source and survival enthusiast
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Evidence for larger animals usually having shorter legs? This is not the case among theropods. At least when compared to length (definitely not weight) the legs of Giganotosaurus are longer than in allosaurus. They do certainly get shorter when compared to the body mass, because it is common that larger animals do get bulkier, but this was not included in my calculation. no-one doubts that spinosaurus was PROPORTIONALLY shorter legged than T. rex (again, here it is compared to the lenght, not weight), but as we all know it was by far larger and thus with a high amount of certainity taller. even the most conservative estimates I calculated in that quote still place it at 16,3m and more than 9t, with a femur of nearly 1,6m, thus larger than any other theropods femur, even taking into account the extrapolated figure for the paratype of giganotosaurus.
sorry, this is frankly wrong. they give it a weight of 9,1t and that is so far the highest of the values in their study that has actually found acceptance among some people. the estimates above it where never regarded as representing a correct weight. And again, in the years mass estimates have always centered below 7t. This 9t T. rex is totally exagerated in bulk and it doesn´t match any other related-theropod-mass-estimate. verdugo, where exactly did hone suggest 9t? and more importantly, was it guess, citing the study or his own estimate? if you think below 7t is ridiculous, what do you think about nother theropods? if you want to tell it from seeing their skulls, what about this one? http://3.bp.blogspot.com/-Q7Oq_jSEyUA/TsOcwSrIEZI/AAAAAAAAGuU/Vv0A5nghaWQ/s1600/carcharodontosaurus.jpg they all would get much heavier using that logic. Ridiculous is only your assumption "look, this T. rex skull is impressive! so it has to be very heavy!" without taking into account that you then obviously underestimated every theropods weight |
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| Gecko | Oct 8 2012, 02:13 AM Post #748 |
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Autotrophic Organism
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Wrong? If I'm not mistaken 9502 kg is 10.4 tons and thats the minimum weight. ![]() Tyrannosaurus weighed more than the other giant theropods(with the exception of Spinosaurus). Tyrannosaurus was much wider then them, that's why they're heavier. David Hone mentioned on a few of the ask a biologists pages that Tyrannosaurus was probably the heaviest of the 3 big one. For one that Carcharodontosaurus was reconstructed way too long. Giganotosaurus recently had it's skull down sized to 1.56 m, Carcharodontosaurus would have been smaller. Two, Tyrannosaurus's skull is twice as wide as other theropod skulls (Even more with Spinosaurus's slender skull). Why don't you post a picture of that skull from the front and see how wide it is... ![]() ![]() ![]() Tyrannosaurus: ![]() ![]() Tyrannosaurus's skull is almost 3 times as wide. Carcharodontosaurus may have been a few cm longer but that's about it. This image is to scale. Edited by Gecko, Oct 8 2012, 02:30 AM.
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| Grey | Oct 8 2012, 02:28 AM Post #749 |
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Kleptoparasite
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In term of skull/head/jaws robustness, I'm quite convinced by the Tyrannosaurus argumentation. I was impressed by the density and surprisingly robust structure of Spinosaurus reconstruction skull, but looking at their respective structure, which the key IMO to determine the greatest killer, I understand why T.rex has still its supporters. Spinosaurus problem is that it remains after all a very enigmatic creature, with no real consensus about its size, the shape/length of its skull, its weaponry potency... And ultimately the common image we have of it could be drastically changed in the next publication... |
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| 7Alx | Oct 8 2012, 04:15 AM Post #750 |
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Herbivore
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Dal Sasso's Spinosaurus and Tyrannosaurus. ![]() |
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. Now it is getting VERY ridiculous for Sue to weigh less than 7 tonnes. Dave Hone suggested Sue would weigh 9 tonnes, the new estimate gives Sue up to 9,5 tonnes.









2:24 AM Jul 14