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| Gigantoraptor erlianensis v Megalosaurus bucklandii | |
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| Tweet Topic Started: Dec 2 2017, 09:19 PM (734 Views) | |
| Taipan | Dec 2 2017, 09:19 PM Post #1 |
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Gigantoraptor erlianensis Gigantoraptor is a genus of giant oviraptorosaurian theropod dinosaur that lived 70 million years ago during the late Cretaceous Period. It was discovered in 2005 in the Iren Dabasu Formation, Erlian basin, in Inner Mongolia. It was clear to Xu et al. that Gigantoraptor belonged to the Oviraptorosauria, a group named after Oviraptor, but compared to other known members, Gigantoraptor was much larger, approximately three times as long and 35 times more massive than the heaviest earlier discovered oviraptorosaurid Citipati. Xu et al. estimated the length at 8 metres (26 ft) and the weight at 1400 kilogrammes. In 2010 Gregory S. Paul even gave an estimate of two tonnes (2.2 tons). The toothless lower jaws of Gigantoraptor are fused into a broad shovel-like mandibula. They indicate that the unknown skull was over half a metre long and toothless also, probably equipped with a horny beak. The front tail vertebrae have very long neural spines and are heavily pneumaticised with deep pleurocoels. The middle section of the relatively short tail is somewhat stiffened by long prezygapophyses. The back tail vertebrae are lightened by spongeous bone. The front limb is rather long because of an elongated slender hand. The humerus is bowed outwards to an exceptionally large extent and has a very rounded head. The first metacarpal is very short and carries a strongly diverging thumb. The hindlimb is also long because of an elongated lower leg. The thighbone is relatively slender and short with a distinct head and neck. The foot is robust with large and strongly curved toe claws. No direct evidence of feathers was preserved with the skeleton, but Xu et al. (2007) discussed their likely presence on Gigantoraptor. They admitted that despite Gigantoraptor being a member of the Oviraptorosauria, a group that includes the feathered species Caudipteryx and Protarchaeopteryx, it might have been "naked" because it is three hundred times more massive than these species, and very large animals may rely more on mass for temperature regulation, losing the insulating coverings found on their smaller relatives. However, they suggested that at least arm feathers were probably still present on Gigantoraptor, since their primary functions, such as display and covering the eggs while brooding, are not related to the regulation of body heat. ![]() 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). ![]()
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| Carnotaur | Dec 2 2017, 09:47 PM Post #2 |
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Saprotrophic Organism
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It is hard for me to believe that Megalosaurus, at 9 meters, had half the mass of Gigantoraptor, at 8 meters (according to the opening post), considering Megalosaurus was a very robust animal (as you can see on Hartman's skeletal here). If the length estimates for these animals are correct, Megalosaurus should be the one with the size advantage here. Also, it certainly had better weaponry: a very large and robust maw filled with blade-like teeth, against the toothless beak of Gigantoraptor. In such case, Megalosaurus should win almost all the time. If the mass estimates for both animals are correct (something that I sincerely doubt), then Gigantoraptor would have the size advantage, but I'm still not sure if that would be the sufficient to overcome its relatively bad weaponry. |
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| GallirallusAustralis | Dec 2 2017, 09:56 PM Post #3 |
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Autotrophic Organism
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I think Megalo is a bit stronger. |
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| Drift | Jan 24 2018, 10:02 PM Post #4 |
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High Spined Lizard
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Hmm it seems logical to say this is an accurate overview of the situation. |
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| WaffleKing | Jan 30 2018, 12:11 PM Post #5 |
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Heterotrophic Organism
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I think this is a pretty big mismatch in favor of megalosaurus. |
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| ApexBoy | Jun 18 2018, 05:31 AM Post #6 |
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Autotrophic Organism
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Megalosaurus. It was the top predator.
https://en.wikipedia.org/wiki/Megalosaurus#Later_finds_of_Megalosaurus_bucklandii The Gigantoraptor was deemed a speedster herbivore, and not so much bigger than the Megalosaur.
https://en.wikipedia.org/wiki/Gigantoraptor It does not seem drastically bigger than the Megalosaursus, and does not seem to be bulky or armoured, so I give it to Mr. M Edited by ApexBoy, Jun 18 2018, 05:32 AM.
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