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| Carcharodontosaurus saharicus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jun 8 2012, 05:34 PM (130,013 Views) | |
| Taipan | Jun 8 2012, 05:34 PM Post #1 |
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Carcharodontosaurus saharicus This huge meat eater was 45 feet long (5 feet longer than T-rex) and weighed 8 tons, making it one of the largest carnivores that ever walked the earth. This African carnosaur had a gigantic 5’4" long skull and enormous jaws with 8" long serrated teeth. It walked on two legs, had a massive tail, bulky body and short arms ending in three-fingered hands with sharp claws. Carcharodontosaurus is one of the longest and heaviest known carnivorous dinosaurs, with various scientists proposing length estimates ranging between 12 and 13 m (39-43.5 ft) and weight estimates between 6 and 15 metric tons. Its long, muscular legs, and fossilized trackways indicate that it could run about 20 miles per hour, though there is some controversy as to whether it actually did, a forward fall would have been deadly to Carcharodontosaurus, due to the inability of its small arms to brace the animal when it landed. Carcharodontosaurus was a carnivore, with enormous jaws and long, serrated teeth up to eight inches long. ![]() 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. ![]() _________________________________________________________________________________
Edited by Taipan, Apr 24 2015, 10:18 PM.
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| Ursus panthera | Nov 14 2012, 01:44 AM Post #196 |
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Artiodactyla
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Joking
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| theropod | Nov 14 2012, 02:00 AM Post #197 |
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palaeontology, open source and survival enthusiast
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The point is that the hands of a theropod are not called paws. they have large claws, but their purpose was rather gripping and positioning, not primarily doing damage |
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| Verdugo | Nov 14 2012, 03:20 AM Post #198 |
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Large Carnivores Enthusiast
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Man, Tyrannosauridae is more agile than a same sized Carnosaur due to being arctometatarsal. I have cited like thousand times =_= And being slender doesn't equal more agile, you just over-simplifying. I wouldn't say a gray wolf is more agile than a cougar because it is slender you know Edited by Verdugo, Nov 14 2012, 03:21 AM.
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| theropod | Nov 14 2012, 03:28 AM Post #199 |
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palaeontology, open source and survival enthusiast
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there is a great difference between grey wolves and cougars because wolves are cursorial. But what about explaining why being arctometatarsal equals being more agile? isn´t that oversimplyfying, especially when you can´t even find an explanation stating why it is advantageaous to have a strangely shaped mid metatarsal kind of jammed between the others? |
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| Verdugo | Nov 14 2012, 03:51 AM Post #200 |
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Large Carnivores Enthusiast
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Cursorial doesn't equal less agile
Edited by Verdugo, Nov 14 2012, 03:58 AM.
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| theropod | Nov 14 2012, 04:14 AM Post #201 |
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palaeontology, open source and survival enthusiast
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still no proper analysis of the mechanical properties, just a deduction without describing why an arctometatarsal should be that much better... |
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| Black Ice | Nov 14 2012, 04:19 AM Post #202 |
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Drom King
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Have they done that same study on other carnosaurs etc. to finalize it? Sounds like they made the assumption based off one type of theropod. |
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| Verdugo | Nov 14 2012, 04:20 AM Post #203 |
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Large Carnivores Enthusiast
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Man, you seriously need an comprehensive explanation ?. I believe that is quite substantial Andrea Cau clearly stated that T rex is more agile, |
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| Black Ice | Nov 14 2012, 04:23 AM Post #204 |
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Drom King
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Did he test it on other carnosaurs????? |
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| theropod | Nov 14 2012, 04:30 AM Post #205 |
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palaeontology, open source and survival enthusiast
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No, he did state it was plausible, without an analysis or further explanation, just a blog post (whose exact meaning might not even have been translated correctly). That´s a big difference. Exactly, before believeing something I want a proper explanation, a mechanical test or a logical explanation, not a claim that it is generally said like that or it would probably have better properties. Is there a paper explaning on the advantages of an arctometatarsal for being more agile than other animals with a generally less bulky built? |
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| theropod | Nov 14 2012, 04:42 AM Post #206 |
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palaeontology, open source and survival enthusiast
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http://www.bio.ucalgary.ca/contact/faculty/pdf/russell/274.pdf
Clear what I mean? the whole thing is not more than a hypothesis, there is obviously no direct evidence for enhanced agility. It might jsut be a different shape that evolved as a more elongated shape like it is typical for small and gracile animals. Tyrannosaurs then retained this trait, that doesn´t mean they have better agility because of it. |
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| Black Ice | Nov 14 2012, 04:55 AM Post #207 |
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Drom King
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I'd love to see that paper too. As the legs aren't the only thing that contributes to agility. You still have the hip placement, ankle sockets and joints etc. you can't just say t.rex is more agile because it has acrometatarsal only. That's not the only thing contributing to agility, even then the term agility is used as an extremely general term. |
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| theropod | Nov 14 2012, 04:59 AM Post #208 |
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palaeontology, open source and survival enthusiast
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A longer leg is not necessarily beneficial for agility, a longer metatarsal in particular ought to make the whole animal less stable is at all. Shorter legs and a less bulky body allow better accelleration (the leg muscles remain similar but the leverage is better). We´ll see about the details of which one is more agile, but claiming T. rex was is premature. |
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| Verdugo | Nov 15 2012, 12:08 AM Post #209 |
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Large Carnivores Enthusiast
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A slender body isn't either
Shorter legs doesn't equal quicker acceleration, why don't you tell that to the cheetah ? And if you notice, T rex has shorter femur => shorter fiber length; more muscular legs which would make it easier to exert its strength and therefore accelerate faster.
And you don't have a single proof to prove that Carnosaur is more agile than same sized Tyrannosaurid ?. At least i still have one, directly claim from scientist, and if you remember, Gecko has showed that Hartman also claims the same thing as Cau
Probably, but claiming Carchar is more agile is unreasonable since there is NO proof, scientist claims or paper to prove that Edited by Verdugo, Nov 15 2012, 12:09 AM.
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| theropod | Nov 15 2012, 12:41 AM Post #210 |
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palaeontology, open source and survival enthusiast
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I have, it is not as bulky, but I´m not the one making the claims here. A shorter femur means you have a shorter lever on the one end, and which do you think takes more force to move and thus longer to accellerate, a shorter or a longer lever? |
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