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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,124 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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| Tyrant | Nov 13 2014, 05:29 AM Post #3856 |
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Omnivore
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Uh no. You clearly don't understand how a debate works. The one making the claim has to present the evidence, while the one disagreeing isn't obligated to do so. I have seen no evidence suggesting spinosaurus, an animal primarily designed to hunt fish that were smaller than itself could pull down an animal as large as tyrannosaurus.
How is that relevant?
Really? Six to eight ton fish. You have evidence that spinosaurus hunted t.rex sized fish?
What...The...F uck? When did I ever deny the fact that spinosaurus could walk? Seriously when? |
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| Jiggly Mimus | Nov 14 2014, 12:15 AM Post #3857 |
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Heterotrophic Organism
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Sir are you willing to listen or are you willing to be a frustrated and immature and choose not to understand. |
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| theropod | Nov 14 2014, 12:59 AM Post #3858 |
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palaeontology, open source and survival enthusiast
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Disagreeing with a claim doesn't require evidence? BS. It constitutes a claim itself, therefore it also requires evidence. Otherwise, if I claimed that Tyrannosaurus was able to walk I'd be the one obliged to bring egidence, but not whoever diasagrees with it. What you are debating is just who of you is making the more exceptional claim, and therefore requires the stronger arguments. Now I personally fail to see what's so extraordinary about spinosaaurus being able to use its forelimbs as meathooks to pull something down, but I'd also like to see this statement supported by actual evidence. |
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| Jiggly Mimus | Nov 14 2014, 01:39 AM Post #3859 |
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Heterotrophic Organism
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Recent analysis of its teeth and skeleton have suggested that Spinosaurus may have been a semi-aquatic animal, spending most of its time either wading or swimming to catch large fish (sharks included), as well as crocodiles and anything else it could capture. Its strong forearms would aid in swimming and the strong claws would hook, kill and help dismembering large prey. http://listverse.com/ A coelacanth could get up to a size of 198 pounds today which could have been far more in prehistoric times.http://animals.nationalgeographic.com/animals/fish/coelacanth/ Now if you include current you could get those puppies easily swimming faster then 20 mph if you add the weight and how fast it slams into the arms. That spinosaurus could have had a great arm strength. Is that good enough? Edited by Jiggly Mimus, Nov 14 2014, 08:24 AM.
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| Tyrant | Nov 14 2014, 10:29 AM Post #3860 |
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Omnivore
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Lol. You're the one who has twisted my words to the point where you actually acted as if I denied the fact that spinosaurus could walk on land.
When the other side also lacks evidence, yes. I don't see why the one who is skeptical of someone else's assertion is the one required to bring the evidence.
Pull down? As in pull down to the ground, as a lion would pull down a wild beast?.
I know this. It's precisely why I favor tyrannosaurus over spinosaurus.
Okay. I hope you realize that while that fish may be big, it is nowhere near as heavy or strong as a tyrannosaurus would be.
Again, you're either twisting my points or misinterpreting them in a severely dramatic fashion. I never said that spinosaurus's arms were weak, I said that they weren't strong enough to pull down a tyrannosaurus or be a major factor in a fight between them. |
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| Black Ice | Nov 14 2014, 10:32 AM Post #3861 |
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Drom King
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258 pages. Nothing even close to an agreement. RIP. |
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| Jiggly Mimus | Nov 14 2014, 12:09 PM Post #3862 |
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Heterotrophic Organism
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Why could it not sauropods did it with there wait why couldn't spino? |
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| Ceratodromeus | Nov 14 2014, 12:20 PM Post #3863 |
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Aspiring herpetologist
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first off, sauropods don't have fingers. secondly, their forelimbs are (obviously) morphilogically dissimilar to those of theropods. columnar legs really aren't suited for aiding in food gathering in the spinosaurus has been hypothesized to catch fish. the coelocanths and miscellaneous fish it hunted -- along with small dinosaurs -- weigh a minute fraction of what T. rex weighed. i don't think it's going to be dragging the tyrannosaur to the ground |
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| Jiggly Mimus | Nov 14 2014, 12:55 PM Post #3864 |
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Heterotrophic Organism
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You are missunderstanding me I dont want it to be pulled down by the arms alone. I want it to be pulled down enough for the head to bite and land a blow to it and maybe rip at it |
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| The Reptile | Nov 14 2014, 02:07 PM Post #3865 |
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Herbivore
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Scientifically, sauropods do have phalanges, but they do not protrude like in theropods or primates. They are like elephants; their exterior feet were likely supported by thick padding.
Except the thing you are forgetting is that increased robusticity/size proportional to body size would make forearm use on land a much more forgettable idea. Simply because balance would be far too much of a hinderance. The forearms of all theropods really were not that well suited for killing at all, especially when they were reduced like in abelisaurids or tyrannosaurids. Even if they were enhanced to be capable of supporting the weight of the animal in spinosaurus, consider the fact that the creature would be practically unable to move due to weaker hind limbs and balance tipping forward like a seesaw. And are you completely forgetting about the fact that its jaws and teeth were designed first and foremost for gripping fish? If the forearms were more locomotory, then the jaws would have provided even a greater function in grabbing fish, just like modern crocodiles whose limbs have been reduced to complete irrelevance when hunting (and the Indian gharial cannot even high-walk!) Edited by The Reptile, Nov 14 2014, 02:14 PM.
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| Jiggly Mimus | Nov 14 2014, 11:34 PM Post #3866 |
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Heterotrophic Organism
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Then the claws on it were irrelevant. Nature tends to get rid of things with no point. |
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| Tyrant | Nov 15 2014, 02:39 PM Post #3867 |
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Omnivore
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^Or they evolved for a non combative purpose, like catching fish. By the way, I am not claiming that a spinosaurus couldn't use its arms in a fight just that they aren't going to be a significant factor. |
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| theropod | Nov 15 2014, 05:21 PM Post #3868 |
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palaeontology, open source and survival enthusiast
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Quite possible that they did, but that isn't an argument to suggest they were ineffective weapons. |
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| Jiggly Mimus | Nov 16 2014, 02:29 AM Post #3869 |
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Heterotrophic Organism
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In roman times they used spears and nets. Both of witch were originally intended for fishing. These claws with a good swipe would have done a lot of damage. I am thinking no the arms weren't for grappling. I was saying it was to basically pull it down just enough (i know that sounds counter intuitive) to get a good bit in there. |
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| Spartan | Nov 16 2014, 12:18 PM Post #3870 |
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Kleptoparasite
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This battle would be fought with jaws, not claws. I don't think they would play a major role. |
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