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| Tyrannosaurus rex v Ankylosaurus magniventris | |
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| Tweet Topic Started: Jan 28 2012, 10:08 PM (48,648 Views) | |
| Taipan | Jan 28 2012, 10:08 PM Post #1 |
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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. 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. ![]() Ankylosaurus magniventris Ankylosaurus is a genus of ankylosaurid dinosaur, containing one species, A. magniventris. Fossils of Ankylosaurus are found in geologic formations dating to the very end of the Cretaceous Period (about 66.5–65.5 Ma ago) in western North America. Although a complete skeleton has not been discovered and several other dinosaurs are represented by more extensive fossil material, Ankylosaurus is often considered the archetypal armored dinosaur. Other ankylosaurids shared its well-known features—the heavily-armored body and massive bony tail club—but Ankylosaurus was the largest known member of the family. In comparison with modern land animals the adult Ankylosaurus was very large. Some scientists have estimated a length of 9 meters (30 ft). Another reconstruction suggests a significantly smaller size, at 6.25 m (20.5 ft) long, up to 1.5 m (5 ft) wide and about 1.7 m (5.5 ft) high at the hip. Ankylosaurus may have weighed over 6,000 kilograms (13,000 lb), making it one of the heaviest armored dinosaurs yet discovered. The body shape was low-slung and quite wide. It was quadrupedal, with the hind limbs longer than the forelimbs. Although its feet are still unknown, comparisons with other ankylosaurids suggest Ankylosaurus probably had five toes on each foot. The skull was low and triangular in shape, wider than it was long. The largest known skull measures 64.5 centimeters (25 in) long and 74.5 cm (29 in) wide. ![]() ______________________________________________________________________________
Edited by Taipan, May 25 2018, 11:58 PM.
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| Ceratodromeus | Aug 3 2016, 02:28 AM Post #286 |
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Aspiring herpetologist
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It is clearly a defensive adaptation to be so heavily armored. also stop making false statements, no one is denying anything. |
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| Thalassophoneus | Aug 3 2016, 06:42 AM Post #287 |
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Pelagic Killer
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Just to make clear, no animal is "designed to". Tyrannosaurus simply happened to receive this adaptation of 57.000 N bite force. Cause apparently luck was on its side. Whether it could indeed bite through armors is something we need to judge. Edited by Thalassophoneus, Aug 3 2016, 06:42 AM.
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| Spartan | Aug 3 2016, 06:48 AM Post #288 |
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Kleptoparasite
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And how would you know that? |
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| Ausar | Aug 3 2016, 07:18 AM Post #289 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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That's not really how it works. Animals don't get certain characteristics like an exceptionally high bite force because of "luck". Such characteristics are the result of natural selection. |
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| Thalassophoneus | Aug 3 2016, 07:23 AM Post #290 |
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Pelagic Killer
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Such characteristics are derived randomly through evolution. Natural selection is basically the rule that some animals have better traits that will help them survive and some others don't, so they go extinct. Basically it would be right to say that "Tyrannosaurus COULD bite through armor" rather than "Tyrannosaurus WAS DESIGNED TO bite through armor". So my statement is basically that whether it could should be judged based on data. |
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| Ausar | Aug 3 2016, 07:40 AM Post #291 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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I know how natural selection works. It's just that your original comment kind of sounded like you were suggesting that Tyrannosaurus just happened to have a powerful bite without any true reason to it (the reason being that the ecological conditions its ancestors lived under would have made individuals that could bite harder more likely to survive and pass on this trait). Edited by Ausar, Aug 3 2016, 07:41 AM.
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| Jaws | Aug 29 2016, 07:46 AM Post #292 |
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Heterotrophic Organism
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Isn't anky like 2 tons or am I missing something? |
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| Grimace | Aug 29 2016, 08:11 AM Post #293 |
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Kleptoparasite
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More importantly, ankylosaurus has a weapon designed to mow down pretty much anything. I don't think even any of the really big sauropods would handle getting a full on smack in the ankle very well. If we are talking strictly adaptations, what adaptations does a tyrannosaur's skull/legs have to protect it from a huge club being smashing into them? Edited by Grimace, Aug 29 2016, 08:29 AM.
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| Ceratodromeus | Aug 29 2016, 08:18 AM Post #294 |
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Aspiring herpetologist
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They are estimated to be a quite bit larger than this. |
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| Ausar | Aug 29 2016, 08:44 AM Post #295 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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Wait, wait, wait. The "really big sauropods" as in...from what specific size range? |
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| Grimace | Aug 29 2016, 09:10 AM Post #296 |
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Kleptoparasite
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I mean, I wasn't saying it'd just explode out their leg or anything, but even if you're a titanosaur getting bashed in the ankle is going to at least probably hurt a lot. |
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| Ausar | Aug 29 2016, 10:09 AM Post #297 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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Okay, that makes a lot more sense. |
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| Jaws | Aug 30 2016, 11:24 AM Post #298 |
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Heterotrophic Organism
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So like 4 tons? Would't Rexy just step on the anky? |
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| Ceratodromeus | Aug 30 2016, 11:55 AM Post #299 |
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Aspiring herpetologist
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Somewhere around the 4-5 ton range iirc. Step on it? Probably not, no. |
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| spinosaurus rex | Sep 21 2016, 11:04 AM Post #300 |
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Carnivore
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looks like a tyrannosaurus of at least 12 meters can get their gape around an ankylosaurs girth |
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