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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,375 Views)
Wolf Eagle
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Tyrannosaurus rex
Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. The species Tyrannosaurus rex (rex meaning "king" in Latin), commonly abbreviated to T. rex, is a fixture in popular culture. It lived throughout what is now western North America, with a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 67 to 65.5 million years ago.[1] It was among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event. Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to the large and powerful hindlimbs, Tyrannosaurus forelimbs were small, though unusually powerful for their size, and bore two clawed digits. Although other theropods rivaled or exceeded Tyrannosaurus rex in size, it was the largest known tyrannosaurid and one of the largest known land predators. By far the largest carnivore in its environment, Tyrannosaurus rex may have been an apex predator, preying upon hadrosaurs and ceratopsians, although some experts have suggested it was primarily a scavenger. The debate over Tyrannosaurus as apex predator or scavenger is among the longest running in paleontology. Tyrannosaurus rex was one of the largest land carnivores of all time; the largest complete specimen, FMNH PR2081 ("Sue"), measured 12.8 metres (42 ft) long, and was 4.0 metres (13.1 ft) tall at the hips. Mass estimates have varied widely over the years, from more than 7.2 metric tons (7.9 short tons), to less than 4.5 metric tons (5.0 short tons), with most modern estimates ranging between 5.4 and 6.8 metric tons (6.0 and 7.5 short tons). Packard et al. (2009) tested dinosaur mass estimation procedures on elephants and concluded that dinosaur estimations are flawed and produce over-estimations; thus, the weight of Tyrannosaurus could be much less than usually estimated. Other estimations have concluded that the largest known Tyrannosaurus specimens had a weight exceeding 9 tonnes.

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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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Edited by Taipan, Apr 24 2015, 10:10 PM.
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Jinfengopteryx
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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theropod
Jul 9 2012, 01:32 AM
There was a size comparison earlier on this tread. It made pretty obvious which one wins.
Another thing, I find pretty interessting on the scale, is how close the spines are together. It would be nearly impossible to span enough skin between for a sail. So we can say, the sail theory is debunked, but the humb one too. Recently, I'm believing in a crest(quite similar to a humb).
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theropod
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That seems the most likely explanation. I didn´t mean a hump as heavily built as a Bison´s, that would probably be impossible for a bipedal animal, but rather something slender, crest like, but much thicker than a sail.
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SpinoInWonderland
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Grey
Jul 9 2012, 02:22 AM
cougarlionlover45
Jul 8 2012, 11:24 PM
Tyrannosaurus would win because the bite force the teeth and the Spino's height size isn't really a advantage cause rex could go up and bottom of his to it's throat and bite it so T-Rex
Frankly poor description.

How a 12 m predator could kill a 18 m one almost as dangerously armed at parity ?
Don't take him seriously, he's a T. rex fanboy

Spinosaurus would win, it has claws, size, a good bite, and a psychological advantage that comes with the size and also due to the fact that the sail makes the Spinosaurus look larger than it really is
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theropod
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Or it was a muscular crest that would give it extra strenght.
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Jinfengopteryx
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Some people suggest that the hump was for storing fat. like a camels, I think this is the debunked one. The crest wasn't debbunked. However, a sail is stupid, there would be too low skin, because of the lmited space. The hump could give it muscels for the neck, to draw out fish or to elp it while staying very long in the water(this can cause pain to the neck, if it has to stay bent for a very long time.)

However, a 18m carnivore vs a 12m one, is even in the near of a missmatch. If it's true what grey siad(Spino was bulkier than Baryonyx)it could have been 3 times heavier.
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ArachnidKid
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IMO the piscivore doesn't last very long in a fight,It's bite is inferior ( not saying its weak, its just not as high) along its vision. Tyrannosaurs would be the victor it seems here IMO
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Jinfengopteryx
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Read previous posts!!!
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ArachnidKid
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Jinfengopteryx
Jul 16 2012, 03:46 AM
Read previous posts!!!
The same could be said to you,This time read the comments not written by emotion but by data and proof (i.e., regarding t-rex bite,I.Q.,eye sight) lol
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theropod
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The scale sais it all. Even though a piscivore, spinosaurus is much bigger, probably more muscular considering the muscle attachment-crest on it´s back, it has a relatively strong bite, and fearsome claws. That´s enough to win imo
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Megafelis Fatalis
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Could Spinosaurus reach 18m long ?? and is there is any evidence ??
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theropod
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Wasn´t there once a skull estimated at 2m or even more?
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Megafelis Fatalis
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PLEASE READ FIG 2
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Kronosaurus82
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Godzillasaurus
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tyrannotitan
May 19 2012, 11:02 PM
T rex would win a 40 foot predator vs a 60 foot fish eater rex was made for hunting not spinosaurus
Spinosaurus, though mainly piscivorous, was large and powerful enough to take down dinosaurs. Not to mention how iguanadon fossils have been found in a baryonyx stomach cavity. Compared to baryonyx, spinosaurus was huge, and its snout was much thicker proportionally. False gharials, for example, have taken down deer and monkeys despite having thin snouts.
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Godzillasaurus
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Spinosaurus kills the t-rex, but not easily. Spinosaurus was much larger than tyrannosaurus, and is also heavily underrated. Spinosaurus had long, yet very sturdy jaws, sharp conical teeth, and powerful forearms. Tyrannosaurus had its fair share of decent weaponry too: powerful jaws, thick teeth designed for crushing, and a thick-set skull morphology. If this was at similar sizes and weights, I would have to say the tyrannosaurus has this one down. However, going by their overall largest size estimates, spinosaurus comes out victorious.
Edited by Godzillasaurus, Jul 2 2013, 03:17 AM.
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7Alx
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WTF? Tyrannosaurus looks too big compared to Spinosaurus or spino is too short (at height). Spinosaurus (if 17 m in length and weight 7-14 tons for the largest spino is true) would be taller than T. rex, even though spinosaurids would have proportionally shorter legs than Tyrannosaurids.

I think Tyrannosaurus would win 55 %, but Spino isn't wimp due size advantage and claws.

Ps. We aren't 100 % sure, whether Baryonyx hunted young iguanodon or it scavenged. However this is evidence proofs that Bary ate land dinosaurs too.
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