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| Allosaurus fragilis (Pack of 5) v Spinosaurus aegyptiacus | |
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| Tweet Topic Started: Oct 25 2012, 09:11 PM (19,016 Views) | |
| DinosaurMichael | Oct 25 2012, 09:11 PM Post #1 |
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Apex Predator
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Allosaurus fragilis (Pack of 5) 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). ![]() This picture will be used from now on when more than 1 Allosaurus is requested in a fight. Spinosaurus aegyptiacus Spinosaurus is a genus of theropod dinosaur which lived in what is now North Africa, from the lower Albian to lower Cenomanian stages of the Cretaceous period, about 112 to 97 million years ago. Spinosaurus may be the largest of all known carnivorous dinosaurs, even larger than Tyrannosaurus and Giganotosaurus. Estimates published in 2005 and 2007 suggest that it was 12.6 to 18 metres (41 to 59 ft) in length and 7 to 20.9 tonnes (7.7 to 23.0 short tons) in weight. The skull of Spinosaurus was long and narrow like that of a modern crocodilian. Spinosaurus is thought to have eaten fish; evidence suggests that it lived both on land and in water like a modern crocodilian. The distinctive spines of Spinosaurus, which were long extensions of the vertebrae, grew to at least 1.65 meters (5.4 ft) long and were likely to have had skin connecting them, forming a sail-like structure, although some authors have suggested that the spines were covered in fat and formed a hump. Multiple functions have been put forward for this structure, including thermoregulation and display. Dal Sasso et al. (2005) assumed that Spinosaurus and Suchomimus had the same body proportions in relation to their skull lengths, and thereby calculated that Spinosaurus was 16 to 18 meters (52 to 59 ft) in length and 7 to 9 tonnes (7.7 to 9.9 short tons) in weight. The Dal Sasso et al. estimates were criticized because the skull length estimate was uncertain, and (assuming that body mass increases as the cube of body length) scaling Suchomimus which was 11 meters (36 ft) long and 3.8 tonnes (4.2 short tons) in mass to the range of estimated lengths of Spinosaurus would produce an estimated body mass of 11.7 to 16.7 tonnes (12.9 to 18.4 short tons). ![]() ______________________________________________________________________________
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| spinosaurus rex | Dec 24 2013, 12:16 AM Post #91 |
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Carnivore
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there are fossilized tracks of a group of theropods hunting a suropod. the theropods identity are believed to be acrocanthosaurus. also mupasuarus bones were found jumbled together, suggesting they could have been in a pack. |
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| Vobby | Dec 24 2013, 12:40 AM Post #92 |
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Omnivore
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Yes: pack hunting is almost non existing amongst reptilia. Archosaurs and reptiles in general may often be gregarious, but to hunt like a pack is a completely different matter. Allosaurus hunting like wolves would be extraordinary, so it is this that needs to be proven, not the opposite. |
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| Jinfengopteryx | Dec 24 2013, 01:12 AM Post #93 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Normally, claims have to be proven, and not disproven (you know this burden of proof story). |
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| Drift | Dec 24 2013, 01:17 PM Post #94 |
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High Spined Lizard
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I still believe 5 is overkill, we know that's enough to wear down any other therapod and take it out.I feel this topic would be better with 3 imo |
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| spinosaurus rex | Dec 24 2013, 01:36 PM Post #95 |
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Carnivore
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how is it overkill? I feel this is a 50/50 match. the allosaurs did have numbers, but they are all outmatched by this carnivore who can potentially outweigh them all with an impressive array of defensive and offensive strikes. not to mention the allosaurs coordination as a pack will also come to questioning. we are not sure if they even coordinated a strike. and the fact that larger animals nearly always dominate smaller pack predators. this fight might actually be more lenient towards the spinosaurs favor. |
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| Carcharadon | Dec 24 2013, 01:38 PM Post #96 |
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Shark Toothed Reptile
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Spinosaurus should win this, i suppose more allosaurus will be needed. |
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| Bistahieversor | Dec 24 2013, 03:42 PM Post #97 |
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Unicellular Organism
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I think there is also a big issue to do with speed to consider here. Spinosaurus, while gargantuan and terrifying, would probably be hampered in its movement by that large sail. Correct me if I'm wrong, but I imagine that having such tall neural spines, all connected by thick tissue (perhaps extra muscle or even fat, in the case of the "fatty-hump" hypothesis) is going to limit overall mobility to some degree; something the Allosaurs will most definitely have. While a Spinosaurus could certainly bum-rush an Allosaur and put it on its back, it could also be very likely that controlling its massive bulk could prove difficult, meaning that quick turns or agile movements might be out of the question for the Spino, meaning that it could have trouble keeping up with smaller, less bulky predators.
Edited by Bistahieversor, Dec 24 2013, 03:44 PM.
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| spinosaurus rex | Dec 24 2013, 04:01 PM Post #98 |
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Carnivore
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all true points. but remember the allosaurs are going to be forced to coming within range of spinosaurus in order to attack it. and if they foolishly decide to mob it head on, its an allosaur massacre. also, despite being a lot smaller then spinosaurus, these allosaurus could weigh 2 tons max themselves. so to be able to attack and dodge a counter attack from the spinosaurus is easier said then done. not to mention that spinosaurus is used to catching fish out of water. for a creature that size, I will call that impressive reflexes. note I am not questioning the allosaurs agility. its quite obvious the allosaurus is much more agile. but I'm saying that to effectively attack a spinosaurus and to avoid a retaliation offence from the spinosaur might be a bit difficult. ps: if a spinosaurus bum rush an allosaurus, that thing is as good as dead. and then it can do it to the next one, then the next one, then the remainder will likely give up and flee. Edited by spinosaurus rex, Dec 24 2013, 04:21 PM.
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| Bistahieversor | Dec 24 2013, 04:34 PM Post #99 |
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Unicellular Organism
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^ I agree that if a Spinosaurus bum rushes an Allosaurus that the Allosaur is toast. Even picking a middle value between the estimated 7 - 23 tons that Spinosaurus could have been leaves you with a monster that could probably generate enough force to crush an Allosaurus, so I imagine any one of the Allosaurs not paying enough attention could easily get caught in the force vector if it was foolish enough to go for the head. Also, another thought: considering the great size of Spinosaurus, an Allosaur's head roughly lines up with those massive claws on the hands of the Spino, which says to me that even if an Allosaurus were able to rush in and try to bite at the stomach, it's going to very quickly learn why that's a bad idea (the jaws of the Spino, in this case, being thought of as its primary weapon and its claws secondary). |
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| spinosaurus rex | Dec 24 2013, 04:42 PM Post #100 |
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Carnivore
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not to mention some of the fish spinosaurus ate can actually weigh more then an average allosaurus, so spinosaurus might actually be able to toss these creatures like ragdolls
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| Bistahieversor | Dec 24 2013, 05:35 PM Post #101 |
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Unicellular Organism
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You know, I actually don't know much about any of the fish that were contemporaries of Spinosaurus that it would have been eating. Info/links? I'm not sure I can imagine a Spinosaurus tossing an Allosaurus with its jaws, but what I like to imagine is the carnage that would result from a straight-up slap with those massive claws. Imagine the gouging and tearing those claws might be capable of if an animal got too close, especially another angry carnivore! |
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| spinosaurus rex | Dec 24 2013, 05:50 PM Post #102 |
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Carnivore
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well, I know they were many large coelacanth and lungfish that can reach lengths of 20 ft or more. as known, lobbed finned fish are extremely dense bodies and can weigh well over a ton. possibly even 2 tons.( 1.5 is probably more likely.) that's about the weight of an allosaurus so yeah, spinosaurus can indeed lift a allosaurus in its jaws. but don't take my last comment too seriously, I really don't think spinosaurus would be tossing them like ragdolls. just mauling them. |
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| spinosaurus rex | Dec 24 2013, 05:54 PM Post #103 |
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Carnivore
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found some picture s of spinosaurus favorite snacks![]() ![]()
Edited by spinosaurus rex, Dec 24 2013, 06:15 PM.
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| spinosaurus rex | Dec 24 2013, 06:18 PM Post #104 |
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Carnivore
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these fish are no joke
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| Vobby | Dec 25 2013, 12:15 AM Post #105 |
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Omnivore
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I somewhat doubt those fishes were commonly found in the brackish waters in which Spinosaurus usually hunted. Consider that Spinosaurus neck have adaptations to strike fast, but not to violently shake, tt's much more a stork than a crocodile. The reason it still wins is that 4 Allosaurus wouldn't be a pack at all. |
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s of spinosaurus favorite snacks

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