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| Allosaurus fragilis v Megalosaurus bucklandii | |
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| Tweet Topic Started: Jun 28 2013, 03:59 PM (6,233 Views) | |
| Taipan | Jun 28 2013, 03:59 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). ![]() Megalosaurus bucklandii Megalosaurus (meaning "Great Lizard", from Greek, μεγαλο-/megalo- meaning 'big', 'tall' or 'great' and σαυρος/sauros meaning 'lizard') is a genus of large meat-eating theropod dinosaurs of the Middle Jurassic period (Bathonian stage, 166 million years ago) of Europe (Southern England, France, Portugal). It is significant as the first genus of dinosaur (outside of birds) to be described and named. n many ways, Megalosaurus was your garden-variety theropod dinosaur, indistinguishable from a host of other big-headed, large-toothed carnivores of the late Jurassic period. What really sets this predator apart is the fact that it was the first dinosaur ever to be discovered and named: a fossilized femur of Megalosaurus was dug up in England in 1676, but it wasn't until 150 years later--after further discoveries--that it was given its name, Greek for "great lizard," by the early paleontologist William Buckland. Size about 30 feet long with weight estimates varying from 700 kg (1,500 lbs) to 1,100 kg (2,400 lbs). ![]() ________________________________________________________________________________ Edited by Taipan, Dec 27 2016, 10:29 PM.
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| retic | Jun 29 2013, 09:24 AM Post #2 |
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snake and dinosaur enthusiast
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allosaurus wins. it has the slight size advantage but it won't be easy. |
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| Creed | Jun 29 2013, 11:34 AM Post #3 |
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Heterotrophic Organism
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Allosaurus and Megalosaurus hmmmm?
Edited by Creed, Jun 29 2013, 11:37 AM.
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| theropod | Jun 30 2013, 03:27 AM Post #4 |
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palaeontology, open source and survival enthusiast
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Megalosaurus is so much more enigmatic than one might think... What we have seems to lack a proper review and size figures, and is mostly a bunch of scattered fragments! The largest femora seem to be below 90cm, but what are the largest specimens? |
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| Carcharadon | Jul 2 2013, 08:43 AM Post #5 |
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Shark Toothed Reptile
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Not really sure, but for now i say allosaurus due to a slight size advantage......... a size comparison would really help.
Edited by Carcharadon, Jul 14 2013, 12:51 AM.
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| thesporerex | Jul 6 2013, 06:12 PM Post #6 |
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Kleptoparasite
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its preety ironic that megalosaurus was the first dinosaur that was identified but yet its one of the dinosaurs we know the least about. I am not voting untill I know more about megalosaurus. |
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| vegetarian | May 31 2014, 07:23 PM Post #7 |
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Herbivore
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allosaurus win |
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| TheMechaBaryonyx789 | Jun 3 2014, 12:31 AM Post #8 |
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Herbivore
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I would give this to Allosaurus due to the fact that Megalosaurus was most likely only 6 metres in length and ~500+kg according to its latest size estimates. |
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| Carcharadon | Jun 3 2014, 01:44 AM Post #9 |
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Shark Toothed Reptile
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Except that there is one megalosaurus known from an 83 cm ilium, BMNH R1101, it was probably about 9 m in length, although this is only the largest megalosaurus. The average was probably closer to 8 m, in which allosaurus still seems to be larger, so i favor it. |
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| TheMechaBaryonyx789 | Jun 6 2014, 12:30 AM Post #10 |
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Herbivore
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Seeing that there is only one Megalosaurus specimen that exceeded 8-9 metres in length, I would decipher an average of around 6-7+ metres. Although 8 metres is definitely within its range. |
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| Kaiju King | Jun 16 2014, 01:09 PM Post #11 |
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Unicellular Organism
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Carcharodon, allosaurus was probably around 9-10 meters in length at maximum, with probably a 25 foot average or so. Nonetheless, they were both macrophagous Jurassic theropods that had similar morphology and prey specialization, so size would definitely mean quite a bit, albeit possibly similar in this regard. |
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| theropod | Jun 16 2014, 08:35 PM Post #12 |
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palaeontology, open source and survival enthusiast
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25ft is just 7.6m, that's likely way below average for mature specimens... |
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| Matando Gueros | Dec 5 2014, 05:41 AM Post #13 |
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Heterotrophic Organism
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Were Megalosaurus's jaws really adapted for crushing ? Because if not, I would see Allosaurus prevailing.
Edited by Matando Gueros, Dec 11 2014, 02:41 AM.
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| The Reptile | Dec 6 2014, 08:44 AM Post #14 |
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Herbivore
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Not necessarily. I have heard accounts of megalosaurid feeding apparata being SIGNIFICANTLY better adapted for crushing than those of allosaurids, but they still possessed some rather allosaur-like characteristics (despite being unrelated) including a rather gracile skull construction and sharply-serrated dentition adapted for cutting. Of course I am not a megalosaurid expert, but I believe this is fundamentally the case. In any case, however, they would have nowhere near the tyrannosaurid potential for crushing (whose skulls were very well designed for both transmitting and resisting force, not to mention how their teeth were not even particularly sharp at all) |
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| Spinodontosaurus | Dec 7 2014, 04:40 AM Post #15 |
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Herbivore
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With such a vague 'characteristic' you could just as easily say that baryonychine theropods possessed some 'allosaur-like characteristics'. Full size version. They aren't alike. |
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