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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,174 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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| theropod | Jan 28 2014, 04:31 AM Post #3106 |
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palaeontology, open source and survival enthusiast
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@blaze: Dunno...perhaps in the same place as accurate measurements of its skull bones? |
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| blaze | Jan 28 2014, 04:37 AM Post #3107 |
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Carnivore
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It's more frustrating when you read things like this, from Carrano et al. (2012)
Well yeah but where can I read about all of that?
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| Jinfengopteryx | Jan 28 2014, 04:48 AM Post #3108 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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But does this really matter (for the fight, yes, but I'm talking about the debate)? Vobby already mentioned that T. rex could do the same with Spinosaurus and go for the limbs of the skull. Edited by Jinfengopteryx, Jan 28 2014, 04:51 AM.
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| Hatzegopteryx | Jan 28 2014, 05:04 AM Post #3109 |
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Unicellular Organism
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Oh I get it |
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| Canadianwildlife | Jan 28 2014, 08:32 AM Post #3110 |
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Apex Predator
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Very well said Vobby. |
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| Canadianwildlife | Jan 28 2014, 08:36 AM Post #3111 |
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Apex Predator
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T-rex has a smaller gape, and yet it killed large prey, unlike spinosaurous, all the time, so its used to biting large objects, and attacking large grazers, triceratops, ankolasuorus, ans such, pardon for my spelling. So, the gape isn't big enough theory is totally underrating the t-rex and the capabilities of its jaws. |
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| Hatzegopteryx | Jan 28 2014, 08:46 AM Post #3112 |
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Unicellular Organism
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It's still a very valid theory and what it fed on doesn't matter since that would mean Triceratops was defenceless due to its diet being composed of plants. Ankylosaurus got downsized to ~6 metres in 2013 so it was probably like ~2 tons. T. rex would crush it under its foot. Also that's a myth, Spinosaurus did kill large prey like Rhino-size fish. And if you want to bring naturl enemies up then I should have you know that Spinosaurus has far more known predators in its environment that meant competition. |
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| Canadianwildlife | Jan 28 2014, 08:57 AM Post #3113 |
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Apex Predator
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There is no proof that spinosaurous fed on fish the size of a rhino, and if their is, please post it. T-rex was used to handling large dangerous prey, prey even bigger than itself. But I will admit, spino- is a large predatory theropod, not a plant eater, so it isn't the same, but you see what I'm getting at. Also, Vobby bbrought out a very good point. The rexes teeth were serated, which meant as he said that it could shake its prey violently while sawing and tearing meat off. If the rex manages to bite the spinosaurous, not only will its powerful bite do major crushing damage, but its serated teeth will as well. Edited by Canadianwildlife, Jan 28 2014, 09:02 AM.
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| Ausar | Jan 28 2014, 09:07 AM Post #3114 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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I think there is a part of Planet Dinosaur that shows something from Onchopristis (giant sawfish) stuck in the mouth of a Spinosaurus. While documentaries aren't exactly something where you'd find hard evidence, IIRC, they had an actual picture of it. Plus, rhino-sized fish, theropod at least as big as an elephant that eats fish? In one ecosystem? Edited by Ausar, Jan 28 2014, 09:11 AM.
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| Hatzegopteryx | Jan 28 2014, 09:13 AM Post #3115 |
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Unicellular Organism
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You sure? Onchopristis. What kind of prey is bigger than T. rex? As far as I am aware of, none of its prey items were actually able of killing it more often than not, with exception for Triceratops, which is roughly the size of an African Bush Elephant, and is still about 50/50 against the tyrannosaurid. But why are we talking about prey? As I said, it doesn't matter here. This is not a predator-prey relation, there is no point comparing their hunting habits. And please don't talk like if the spinosaurid wouldn't defend itself from a bite. |
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| Hatzegopteryx | Jan 28 2014, 09:14 AM Post #3116 |
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Unicellular Organism
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Well yeah I had measured it and got ~10.96 metres but I was terrible at measuring along the cruves back then. |
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| Canadianwildlife | Jan 28 2014, 09:54 AM Post #3117 |
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Apex Predator
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A documentary showed it, but that is no proof at all. I agree that spinosaurous could have killed fish that large, but that doesn't mean it did. Edited by Canadianwildlife, Jan 28 2014, 09:56 AM.
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| Hatzegopteryx | Jan 28 2014, 09:57 AM Post #3118 |
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Unicellular Organism
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Except there is evidence of it feeding on those fish that have been said to be Rhno-sized. Once again this is rather pointless debating since what they fed on doesn't matter here. |
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| Canadianwildlife | Jan 28 2014, 10:02 AM Post #3119 |
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Apex Predator
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Then show me this evidence, and I will cratiche it, spelled it wrong I know. My pont is, yes, there may be evidence, but have they proven that it fed on those fish? Edited by Canadianwildlife, Jan 28 2014, 10:05 AM.
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| Hatzegopteryx | Jan 28 2014, 10:04 AM Post #3120 |
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Unicellular Organism
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Canadianwildlife, that is basic knowledge. I can't believe you just asked me a question that is just common knowledge. We all know small sardines won't feed a multi ton spinosaurid. |
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