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| Allosaurus fragilis v Majungasaurus crenatissimus | |
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| Tweet Topic Started: Jul 3 2012, 05:18 PM (7,424 Views) | |
| Taipan | Jul 3 2012, 05:18 PM Post #1 |
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Allosaurus fragilis Allosaurus (play /ˌælɵˈsɔrəs/) is a genus of large theropod dinosaur that lived 155 to 150 million years ago during the late Jurassic period (Kimmeridgian to early Tithonian). Allosaurus was a large bipedal predator. Its skull was large and equipped with dozens of large, sharp teeth. It averaged 8.5 meters (28 ft) in length, though fragmentary remains suggest it could have reached over 12 meters (39 ft). Relative to the large and powerful hindlimbs, its three-fingered forelimbs were small, and the body was balanced by a long, heavy tail. As the most abundant large predator in the Morrison Formation, Allosaurus was at the top of the food chain, probably preying on contemporaneous large herbivorous dinosaurs and perhaps even other predators (e.g. Ceratosaurus). Potential prey included ornithopods, stegosaurids, and sauropods. Allosaurus was a typical large theropod, having a massive skull on a short neck, a long tail and reduced forelimbs. Allosaurus fragilis, the best-known species, had an average length of 8.5 meters (28 ft), with the largest definitive Allosaurus specimen (AMNH 680) estimated at 9.7 meters long (32 ft), and an estimated weight of 2.3 metric tons (2.5 short tons). In his 1976 monograph on Allosaurus, James Madsen mentioned a range of bone sizes which he interpreted to show a maximum length of 12 to 13 meters (40 to 43 ft). As with dinosaurs in general, weight estimates are debatable, and since 1980 have ranged between 1500 kilograms (3300 lb), 1000 to 4000 kilograms (2200 to 8800 lb), and 1010 kilograms (2230 lb) for modal adult weight (not maximum). John Foster, a specialist on the Morrison Formation, suggests that 1000 kg (2200 lb) is reasonable for large adults of A. fragilis, but that 700 kg (1500 lb) is a closer estimate for individuals represented by the average-sized thigh bones he has measured. Using the subadult specimen nicknamed "Big Al", researchers using computer modelling arrived at a best estimate of 1,500 kilograms (3,300 lb) for the individual, but by varying parameters they found a range from approximately 1,400 kilograms (3,100 lb) to approximately 2,000 kilograms (4,400 lb). ![]() Majungasaurus crenatissimus Majungasaurus (pronounced /məˌdʒʌŋɡəˈsɔrəs/ mah-JUNG-gə-SOR-əs "Mahajanga lizard") is a genus of abelisaurid theropod dinosaur that lived in Madagascar from 70 to 65 million years ago, at the end of the Cretaceous Period. Only one species (M. crenatissimus) has been identified. This dinosaur was briefly called Majungatholus, a name which is now considered a junior synonym of Majungasaurus. Like other abelisaurids, Majungasaurus was a bipedal predator with a short snout. Although the forelimbs are not completely known, they were very short, while the hindlimbs were longer and very stocky. It can be distinguished from other abelisaurids by its wider skull, the very rough texture and thickened bone on the top of its snout, and the single rounded horn on the roof of its skull, which was originally mistaken for the dome of a pachycephalosaur. It also had more teeth in both upper and lower jaws than most abelisaurids. Majungasaurus was a medium-sized theropod that typically measured 6–7 meters (20–23 ft) in length, including its tail. Fragmentary remains of larger individuals indicate that some adults reached lengths of more than 8 meters (26 ft). Scientists estimate that an average adult Majungasaurus weighed more than 1100 kilograms (2400 lb), although the largest animals would have weighed more. Its 8–9 meter (26–30 ft) relative Carnotaurus has been estimated to weigh 1500 kilograms (3300 lb). ![]() ____________________________________________________________
Edited by Taipan, Nov 13 2016, 02:11 PM.
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| theropod | Sep 15 2012, 06:03 AM Post #16 |
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palaeontology, open source and survival enthusiast
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that´s completely made up actually. even subadult allosaurus specimens like big al and big al two where in the range of 7-8m, adults where larger than 8m, the average for A. fragilis was said to be 8-9m, the largest traditional specimen is 9,7m, the largest possible specimen is 12,1m or so. 6m is a juvenile, nothing else. they just took that number assuming no non tyrannosaurid theropod could possibly exceed 10m, and they thought some other theropods where 6m long, so why not allosaurus |
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| SpinoInWonderland | Oct 4 2012, 11:55 AM Post #17 |
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The madness has come back...
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Nonsense. Allosaurus is much larger and has the very formidable axe head |
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| T-Devil | Oct 4 2012, 12:29 PM Post #18 |
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Unicellular Organism
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allosarus its bigger and probably stronger |
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| DinosaurMichael | Oct 25 2012, 01:29 AM Post #19 |
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Apex Predator
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9 meters may of been just very large ones. Is that was probably it's maxium. The average size Majungasaurus would've been more around 7 meters in length or more. |
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| Verdugo | Oct 25 2012, 01:42 AM Post #20 |
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Large Carnivores Enthusiast
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Majungasaurus didn't have STRONG bite force, it is a BIG MYTH |
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| Fragillimus335 | Oct 25 2012, 01:44 AM Post #21 |
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Omnivore
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Allosaurus fragillis was only 1-1.5 tons in weight, no noticeable size advantage, though I still give the fight to Allosaurus. |
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| DinosaurMichael | Oct 25 2012, 01:46 AM Post #22 |
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Apex Predator
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On average Majungasaurus was 2,400 lbs. So yes Allosaurus has a size advantage. |
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| 7Alx | Oct 25 2012, 02:23 AM Post #23 |
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Herbivore
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Average 8.5 m long A. fragilis is around 2 tons. 1.5 tons is for Big al. |
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| DinosaurMichael | Oct 25 2012, 02:25 AM Post #24 |
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Apex Predator
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Isn't the average size Allosaurus 2.5 tons though. That's 5000 lbs. |
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| 7Alx | Oct 25 2012, 02:39 AM Post #25 |
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Herbivore
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2.5 tons is possible. Based on 1.500 kg (1.5 metric tons) Big al, 8.5 m Allosaurus would be 2.18 metric tons. But adult would be proportionally bulkier. |
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| DinosaurMichael | Oct 25 2012, 02:41 AM Post #26 |
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Apex Predator
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What I'm asking though is isn't 5,000 lbs the average weight of Allosaurus? |
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| Fragillimus335 | Oct 25 2012, 03:19 AM Post #27 |
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Omnivore
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No, most adult specimens cluster between 1500-2500 pounds. John Foster, a specialist on the Morrison Formation, suggests that 1000 kg (2200 lb) is reasonable for large adults of A. fragilis, but that 700 kg (1500 lb) is a closer estimate for individuals represented by the average-sized thigh bones he has measured. Allosaurus f. was not a very large dinosaur. Edited by Fragillimus335, Oct 25 2012, 03:21 AM.
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| 7Alx | Oct 25 2012, 03:54 AM Post #28 |
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Herbivore
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700 kg? That's even lighter than 6.7 m Ceratosaurus, which weight is estimated of 1 ton. Unless the weight is overestimated. Here is paper about Allosaurus Big al MOR 693 http://palaeo-electronica.org/2009_3/186/discus.htm Even though Big al isn't A. fragilis, but it doesn't look bulkier than adult A. fragilis specimens Normal Allosaurus fragilis http://upload.wikimedia.org/wikipedia/commons/3/3a/Allosaurus_SDNHM.jpg Allosaurus sp. Big al http://www.statesymbolsusa.org/IMAGES/Utah/Allosaurus-dinosaur-fossil.jpg |
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| Carcharadon | Oct 25 2012, 09:10 AM Post #29 |
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Shark Toothed Reptile
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No, that is exaggurated. Majungasaurus was really only 7 m long or else possibly 8 m at the maximum
Not a very large dinosaur? Of course it was. Oh and it was 2 tons Any dinosaur over 2000 lbs is actually quite very large |
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| Black Ice | Oct 25 2012, 09:36 AM Post #30 |
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Drom King
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I thought allosaurus was a behemoth, looks like carnotaurus would have been a better match up here. |
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