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| Mapusaurus roseae v Tyrannosaurus rex | |
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| Tweet Topic Started: Apr 12 2013, 11:23 AM (13,995 Views) | |
| DinosaurMichael | Apr 12 2013, 11:23 AM Post #1 |
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Apex Predator
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Mapusaurus roseae Mapusaurus ('earth lizard') was a giant carnosaurian dinosaur from the early Late Cretaceous (Cenomanian stage) of what is now Argentina. It was similar in size to its close relative Giganotosaurus, with the largest known individuals estimated as over 12.6 metres (41 ft) in length* and weight estimates of approximately 3 metric tons to 5.5 metric tons. Mapusaurus was excavated between 1997 and 2001, by the Argentinian-Canadian Dinosaur Project, from an exposure of the Huincul Formation (Rio Limay Group, Cenomanian) at Canadon de Gato. It was described and named by paleontologists Rodolfo Coria and Phil Currie in 2006. The fossil remains of Mapusaurus were discovered in a bone bed containing at least seven individuals of various growth stages. Coria and Currie speculated that this may represent a long term, possibly coincidental accumulation of carcasses (some sort of predator trap) and may provide clues about Mapusaurus behavior. Other known theropod bone beds include the Allosaurus-dominated Cleveland Lloyd Dinosaur Quarry of Utah, an Albertosaurus bone bed from Alberta and a Daspletosaurus bone bed from Montana. ![]() 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.
Edited by Taipan, Dec 31 2016, 12:33 PM.
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| theropod | Apr 13 2013, 08:34 PM Post #16 |
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palaeontology, open source and survival enthusiast
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I'm not so fond of that skeletal, the problem may be the way the specimens are mixed up. For example I still cannot believe MCF-PVPH-108.45 was really belonging to a maximum sized Mapusaurus, and this is highly unlikely in any case. Concerning the ribs, I think it is probably exagerated too. The dorsal ribs (undefined MCF-PVPH-108) we have aren't many or complete, and not clearly assigned of course. It is very easy to make a mistake here. Just my opinion tough. imo Mapusaurus is absolutely equal in size, if not slightly larger, than Giganotosaurus. and if you give that mapusaurus there a deeper chest and less puny arms, I think it has an edge here. |
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| 7Alx | Apr 13 2013, 09:55 PM Post #17 |
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Herbivore
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Tyrannotitan holotype had also small arms.
And younger relatives like Giganotosaurus and Mapusaurus would have arms proportionally as short as, if not shorter than in Tyrannotitan. The arms wouldn't be major advantages of Mapusaurus, neither of Tyrannosaurus. |
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| Teratophoneus | May 26 2013, 01:04 AM Post #18 |
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Herbivore
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Same thing with "Giganotosaurus vs Mapusaurus." Mapusaurus has also grown to more than 13 meters in length, and therefore had an advantage of size, but it was more gracile of Tyrannosaurus. 50/50. |
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| theropod | May 26 2013, 06:48 PM Post #19 |
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palaeontology, open source and survival enthusiast
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Short, not that short. Acrocanthosaurus too has short arms, but that doesn't mean they were useless. In Mapusaurus, I am wondering how someone managed to make a reconstruction with such a whimpy pectoral girdle even tough there's a scapular shaft just as large as in Giganotosaurus. and nothing prooves that tiny 30cm-humerus belongs to a large Mapusaurus. Edited by theropod, Aug 11 2013, 07:25 PM.
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| Makaveli7 | Aug 11 2013, 03:28 PM Post #20 |
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Heterotrophic Organism
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Pretty much Giga vs Rex but Mapu was apparently longer but thinner. 50/50 at max sizes. |
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| Jinfengopteryx | Aug 11 2013, 07:00 PM Post #21 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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We don't know if it was thinner. |
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| Ausar | Aug 11 2013, 09:57 PM Post #22 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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Question my beliefs if you want, but I usually think of the Planet Dinosaur Mapusaurus whenever I think of the actual animal itself. It doesn't seem too thin like some skeletals potray it to be, it just seems built like a usual theropod would. In that case I would give this (and every other T.rex vs. similarly sized carnosaur matchup) a 50/50.
Edited by Ausar, Aug 11 2013, 09:58 PM.
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| theropod | Aug 11 2013, 10:55 PM Post #23 |
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palaeontology, open source and survival enthusiast
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PD Mapusaurus was basically Giganotosaurus, just coexisting with Argentinosaurus. Needless to say, they were totally right in their portrayal, there is no sufficient reason imo to say it was a more gracile animal. It's likely pretty much a Giganotosaurus with a slightly different skull shape. The biggest known individual is also marginally larger, but that's due to the bigger sample size. Edited by theropod, Aug 11 2013, 10:56 PM.
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| Palaeogirl | Aug 12 2013, 02:15 AM Post #24 |
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Omnivore
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I'd give a slight edge to T.rex (55%) since T.rex was a bit more robust than most other large theropods. |
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| thesporerex | Aug 12 2013, 05:06 AM Post #25 |
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Kleptoparasite
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I am gonna go with the rex on this one, also what is the largest mapusaurus specimen? |
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| retic | Aug 12 2013, 08:01 AM Post #26 |
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snake and dinosaur enthusiast
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i say 50/50. both were similar in size and they both have deadly weaponry.
Edited by retic, Aug 12 2013, 08:03 AM.
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| Teratophoneus | Sep 10 2013, 07:16 PM Post #27 |
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Herbivore
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@sporex: probably around to 13,4-13,6 m, but a good rough figure would be 13 m. This is a 50/50. Mapusaurus has slicing bite, is slighty larger and has a better mobility. T.rex has a crush bite, is more robust, and is bulkier. Edited by Teratophoneus, Sep 10 2013, 07:17 PM.
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| theropod | Sep 11 2013, 01:49 AM Post #28 |
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palaeontology, open source and survival enthusiast
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Based on Hartman's estimates, It is very likely the biggest Mapusaurus specimen is bigger than the biggest T. rex. Average size for both is trickier since we'd need reliable estimates for all Mapusaurus specimens and determine how much exactly there are/how the remains are distributed among them and how many are immatures. Assuming it's 1,1 times the dimensions of his Giganotosaurus (which is the only figure we have for MCF-PVPH-108.145 and bases on pubic shaft breath and depth) and scales close to isometry, the specimen would have to be ~9t in weight. Considering that's probably still only the largest in a far smaller sample than FMNH PR 2081 in T. rex, that comparison is more than fair. |
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| Composite Gojira | Sep 11 2013, 11:36 AM Post #29 |
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Autotrophic Organism
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55/45 Tyrannosaurus, assuming we use the upper end for Mapusaurus. Same as my answer for Rex vs. Giganotosaurus. |
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| DarkGricer | Sep 11 2013, 12:33 PM Post #30 |
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Omnivore
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I've changed my mind. According to my calculations, 13.6 meter Mapusaurus would weigh 9 tons. At that size I'd favor it over any T.rex. |
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