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| Mapusaurus roseae v Tyrannosaurus rex | |
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| Tweet Topic Started: Apr 12 2013, 11:23 AM (13,992 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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| Carnoferox | Oct 24 2017, 03:00 PM Post #46 |
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Herbivore
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Nah, this is the stupid quote of the day:
Edited by Carnoferox, Oct 24 2017, 03:02 PM.
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| Jinfengopteryx | Oct 24 2017, 06:37 PM Post #47 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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He's probably suggesting that Tyrannosaurus actually fought its prey while Mapusaurus only chased and ambushed it. There is little basis for such a claim. Or he suggested that Tyrannosaurus had more intraspecific conflict for which there is even less of a basis. |
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| Thalassophoneus | Oct 24 2017, 08:22 PM Post #48 |
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Pelagic Killer
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I don't understand what this means. |
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| Taipan | Oct 24 2017, 08:38 PM Post #49 |
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Administrator
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Probably armour plated bones. |
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| Grazier | Oct 25 2017, 07:48 AM Post #50 |
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Omnivore
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Well if T Rex was primarily a scavenger it could be adapted specifically for fighting predators off their kills and fighting rival scavengers. Such enormous carcasses would each be quite a big long gladitorial event, drawing in contenders from far and wide over a couple of weeks. If this was t-rex's wheelhouse, more so than the hunt, you could say he was more of a fighter than a hunter. If. |
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| Ausar | Oct 25 2017, 11:02 AM Post #51 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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I don't see any reason to think that either is "more of a hunter than a fighter" (seriously?). As for primarily being a scavenger, theropods weighing between 27 and 1,044 kg would have been the most efficient scavengers of their clade; those at either extremes would have been at an energetic disadvantage compared to their more intermediately sized brethren when it came to scavenging efficiency. Tyrannosaurus, and by extension other giant theropods (including Mapusaurus), which surpass the upper threshold at least six times over, would thus have fulfilled a specialized hyperpredator role. Another paper seems to have concluded the same thing, finding Tyrannosaurus in the middle of the scavenging efficiency spectrum (on another note, I presume this means that giant theropods must have had quite high success rates when hunting; they'd have to if they weren't the most efficient scavengers ever and ate nothing but meat). Of course, we also have evidence of intraspecific combat among theropods, where they bit each others faces. So they should have been quite the fighters as well. References: Kane, A; Healy, K; Ruxton, G.D.; Jackson, A.L. (2016). Body Size as a Driver of Scavenging in Theropod Dinosaurs. The American Naturalist. 187(6): pp. 000-000. DOI: 10.1086/686094 Kane, A; Healy, K; Guillerme, T; Ruxton, G.D.; Jackson, A.L. (2016). A recipe for scavenging in vertebrates – the natural history of a behaviour. Ecography. 40(2); pp. 324-334. DOI: 10.1111/ecog.02817 Tanke, D; Currie, P.J. (1998). Head-biting behavior in theropod dinosaurs: Paleopathological evidence. Gaia. LISBOA/LISBON, DEZEMBRO/DECEMBER, pp. 167-184. |
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| Thalassophoneus | Oct 25 2017, 02:35 PM Post #52 |
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Pelagic Killer
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The theory that Tyrannosaurus was a fighter so that it tactically scared other predators away from their catch is an assumption based on another assumption, which is the unconfirmed theory that it was a scavenger. |
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| Ferreomus | Oct 25 2017, 08:56 PM Post #53 |
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Herbivore
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I said both hunt, but I mean mupasaurus wasnt adapted to fighting. Google always incorrect my spellings Edited by Ferreomus, Oct 25 2017, 08:58 PM.
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| Jinfengopteryx | Oct 25 2017, 09:10 PM Post #54 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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What makes you think so? |
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| Thalassophoneus | Oct 25 2017, 11:06 PM Post #55 |
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Pelagic Killer
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What makes you think so? All animals can fight. |
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| TheBatmeme368 | Nov 11 2017, 06:20 AM Post #56 |
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Autotrophic Organism
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Probably his delusion of T. rex killing fully grown Triceratops' everyday and being more difficult than a fully grown Argentinosaurus... Heck, even adolescent ones could be more dangerous, depending on their age. T. rex likely had Hadrosaurs, young, sick or old ones at that, as its main food source. Prey items are pretty irrelevant for fights like these though... I still support T. rex though, for its sheer bulk and similar (or even superior) size. As I don't really believe in 13.6 metre, 9 tonne carcharodontosaurids. Something around ~12.5 metres and ~6.5+ tonnes is more likely in my opinion. In the same boat as Stan and AMNH 5027, while probably outclassed by CM 9380 and such. 55/45 in favour of Tyrannosaurus. Though, on the very slim chance that Mapusaurus averaged at 13.6 metres and 9(+?) tonnes, than it stomps. I'll withhold my vote for now. |
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| Thalassophoneus | Nov 11 2017, 03:16 PM Post #57 |
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Pelagic Killer
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The largest Mapusaurus would have been around Sue's length but slightly lighter. http://carnivoraforum.com/single/?p=10036038&t=9696455 |
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| bone crusher | Nov 13 2017, 02:33 PM Post #58 |
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Heterotrophic Organism
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The largest Mapu is only 6800 kg compares to 8800 kg for Sue, Trix and a few other large T Rex specimens. At two tons weight advantage it's all over.![]() https://franoys.deviantart.com/art/Giant-predatory-dinosaurs-comparison-616409616 Edited by bone crusher, Nov 13 2017, 02:34 PM.
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| Drift | Jan 24 2018, 10:15 PM Post #59 |
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High Spined Lizard
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For once there's a rather accurate depiction used for scale, A tip of the hat to you. |
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| MarlinMan133 | Jul 3 2018, 09:47 AM Post #60 |
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Autotrophic Organism
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Tyrannosaurus bulk is intense It's bite is also quite impressive but, Mapusaurus could use it's bite as an advantage to sheer off the flesh of the Rex all it would take is a good bite to the leg to put Rex down on the ground. But, Tyrannosaurus would simply crush it before it could bite it, 7/10 for Rex |
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