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| Allosaurus fragilis v Majungasaurus crenatissimus | |
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| Tweet Topic Started: Jul 3 2012, 05:18 PM (7,421 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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| Fishfreak | Jul 3 2012, 08:53 PM Post #2 |
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Friend of the fish
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at max sizes yes. but not at average sizes. |
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| DinosaurMichael | Jul 3 2012, 08:54 PM Post #3 |
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Apex Predator
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Isn't allosaurus like at 3,000-5,000 lbs on average, while Majungasaurus is 2,400 lbs on average. So yes a mismatch both average and parity. |
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| Fishfreak | Jul 3 2012, 09:00 PM Post #4 |
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Friend of the fish
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depends who you ask if you read the top text the theories about the average ranges from 700-2000 kg while majungasaurus was 1100 kg if they were about the same length or the allosaurus was only slightly bigger majungasaurus would hyave a fine chance of winning |
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| DinosaurMichael | Jul 3 2012, 09:02 PM Post #5 |
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Apex Predator
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Well I still think it's a mismatch as it's likely Allosaurus was 3,000-5,000 lbs on average. |
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| yigit05 | Sep 8 2012, 08:47 PM Post #6 |
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Kleptoparasite
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allasauros wins size avantage,weight,paws majungasauros stronger bite |
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| theropod | Sep 8 2012, 11:34 PM Post #7 |
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palaeontology, open source and survival enthusiast
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Allosaurus was much larger, it´s neck muscles make a strong bite force redundant and it has claws and a very wide gape. Mahjungasaurus on the other hand has a bulkeir built and a stronger bite force. Appearantly many people favour such creatures that are smaller, bulkier and have a stronger bite over animals superior in every other point, but I don´t... |
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| Verdugo | Sep 8 2012, 11:46 PM Post #8 |
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Large Carnivores Enthusiast
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Nah, i don't favour Majunga is this fight. Its bite force is relatively less than Tyrannosauridae, its teeth are no where near as deadly as Carcharodontosauridae. Allosaurus is bigger, more powerful, more effective and deadlier bite. Allosaurus wins |
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| theropod | Sep 9 2012, 01:08 AM Post #9 |
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palaeontology, open source and survival enthusiast
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and since when is it´s bite force relatively less than tyrannosaurids? for all we know it solely relied on bite force, and I don´t need to post the actual pictures for you to know that it´s skull is short, powerful and immensely robust. At parity there is no reason why a tyrannosaurid should have a stronger bite. |
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| Verdugo | Sep 9 2012, 02:16 AM Post #10 |
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Large Carnivores Enthusiast
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Its skull is relatively much smaller than that of Tyrannosauridae, how can it bite harder than a T rex at parity |
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| theropod | Sep 9 2012, 02:36 AM Post #11 |
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palaeontology, open source and survival enthusiast
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shorter, not smaller |
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| Verdugo | Sep 9 2012, 07:38 PM Post #12 |
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Large Carnivores Enthusiast
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Not only shorter but also smaller |
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| 7Alx | Sep 10 2012, 12:09 AM Post #13 |
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Herbivore
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90 % for Allosaurus. More agile, faster, useful arms with claws and much taller. It is almost mismatch. |
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| theropod | Sep 15 2012, 02:48 AM Post #14 |
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palaeontology, open source and survival enthusiast
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likely the people who think "allosaurus bite wasn´t strong so it looses", or those who think allosaurus only reached 6m... |
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| Jinfengopteryx | Sep 15 2012, 04:16 AM Post #15 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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What is 6m actually based on? It's stated by every Fanboy, but they can't bring sources. |
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