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| Tyrannosaurus rex v Ankylosaurus magniventris | |
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| Tweet Topic Started: Jan 28 2012, 10:08 PM (48,646 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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| blaze | Nov 24 2017, 06:17 AM Post #316 |
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Carnivore
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Excluding armor, which I don't think will increase the weight by 2-3 tonnes in order to match allometric estimates but I do have to find a way to estimate it with precision. |
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| Thalassophoneus | Nov 24 2017, 06:57 AM Post #317 |
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Pelagic Killer
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From now on, in threads with Tyrannosaurus, are we going to take into account that some specimens like Sue might belong to separate taxa? |
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| blaze | Nov 24 2017, 11:07 AM Post #318 |
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Carnivore
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According to whom and on what basis? |
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| Thalassophoneus | Nov 24 2017, 03:06 PM Post #319 |
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Pelagic Killer
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Well first I noticed on Scott Hartman's skeletals that the skulls of Stan and Sue have a different shape from the skulls of the holotype and the AMNH specimen. It looks like the later two have a shorter snout. Also, on Deviantart bricksmashtv has made several specimens and given them several names. And I also saw a comment of paleo-king, under one of his skeletals, where he claimed that Tyrannosaurus might be separated into three species. https://comments.deviantart.com/1/708506050/4486289500 Edited by Thalassophoneus, Nov 24 2017, 03:28 PM.
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| Meancat | Nov 24 2017, 05:21 PM Post #320 |
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Autotrophic Organism
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I vote for tyrannosaurus. It had the strongest bite of any land animal ever and it had robust teeth. Tyrannosaurine teeth were twice as thick as allosaur teeth of similar length. That, combined with the bite, should be enough to penetrate the ankylosaur's armor. |
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| Spartan | Nov 24 2017, 07:07 PM Post #321 |
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Kleptoparasite
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We can start doing so when a peer reviewed paper makes a convincing case for it. |
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| blaze | Nov 30 2017, 03:54 PM Post #322 |
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Carnivore
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Yeah.... you shouldn't take Paleo-King's word for it when it comes to phylogeny. Known skulls of Tyrannosaurus are not identical but this could be due to several factors, more than one species could be it but so far there is no convincing case put forth in the literature. Paleo-King is following Larson, who has argued in technical books for the existence of robust and gracile morphs and "Tyrannosaurus x" but his methods are restricted to rather simple plots of ratios and have zero consideration for stratigraphy, geography and ontogeny, if we apply the first two to Larson's classification of which specimen belongs to which species and it results in 3 Tyrannosaurus species of almost identical size living in the same places for 2 million years, clearly this is not ecologically realistic. I believe there might be two Tyrannosaurus species, one giving rise to the other through anagenesis as is the case with the two Triceratops and Daspletosaurus species (so no overlap in time) but there is nothing in the literature making that argument, perhaps in the future, with the data obtained in Horner's Hell Creek Census. |
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| Drift | Jan 24 2018, 10:03 PM Post #323 |
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High Spined Lizard
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It's like he purposefully tries to embarrass himself. . . |
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| Thalassophoneus | Jan 25 2018, 04:34 AM Post #324 |
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Pelagic Killer
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I have separated myself T. rex into the Montana form (holotype, AMNH 5027) and the South Dakota form (Stan, Sue) due to similarities in skull shape. Although there is nothing in literature suggesting that they are separate taxa, I am positive that something might come out eventually. Right. Whereas you don't even try and yet you are pretty good at embarassing yourself. This is what happens when you keep posting here without letting go of your nonsensical grudge against other members. Edited by Thalassophoneus, Jan 25 2018, 04:39 AM.
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| blaze | Jan 26 2018, 02:56 AM Post #325 |
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Carnivore
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Consider that Sue comes from low in the Formation and Stan from the very top and South Dakota and Montana are right next to each other, this does not bode well for the existence of the forms you propose. |
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| Wombatman | Jan 27 2018, 01:34 AM Post #326 |
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Herbivore
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I would vote Tyrannosaurus more often than not. Also, I find weird that lots of people lump Tarbosaurus bataar within Tyrannosaurus, despite the amount of anatomical differences, specially in the skull, yet other people want to make Sue a different taxa from T. rex |
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| MarlinMan133 | Jul 5 2018, 01:45 AM Post #327 |
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Autotrophic Organism
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How is tyrannosaurus winning this? This is a heavily one sided fight in favor of the tank with a swear wording boulder on it's tail. Is there even a reason to explain? Tyrannosaurus despite being larger has no defenses unlike the Anky which has incredibly tough armor, It would be smashed instantly. |
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| Black Ice | Jul 5 2018, 03:41 AM Post #328 |
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Drom King
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T. Rex quite literally had jaws capable of punching holes in an ankylosaurs skull. |
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| MarlinMan133 | Jul 6 2018, 01:14 AM Post #329 |
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Autotrophic Organism
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Ankylosaurus quite literally had a massive hunk of bone on it's tail capable of breaking a Tyrannosaurus everything. |
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| Black Ice | Jul 6 2018, 02:14 AM Post #330 |
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Drom King
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Irrelevant. This is what you said.
This is incorrect. |
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