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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,086 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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Megasaurus
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Heterotrophic Organism
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LAND-T rex wins,because on land it is faster and it ismobile
WATER-spinosaurus wins
My opinion
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SETA222
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Bump. Anyone interested in this topic?
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LionClaws
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Not even a fight. It's practically a predator-prey relationship. Spino just isn't equipped to kill animals in this size range. There's only one way it can end: an obligate psithophage bleeding out on the ground.
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SETA222
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Quote:
 
Not even a fight. It's practically a predator-prey relationship. Spino just isn't equipped to kill animals in this size range. There's only one way it can end: an obligate psithophage bleeding out on the ground.

Do you see Spinosaurus having atleast little chance of killing T-Rex in an exceptional event? If so, how?
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LeonardosHeir
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I can, if the T. Rex were drinking from a river and the Spino got a surprise bite on its neck and somehow got it to the ground I think the Spino could take this honestly.
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SETA222
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Quote:
 
I can, if the T. Rex were drinking from a river and the Spino got a surprise bite on its neck and somehow got it to the ground I think the Spino could take this honestly.

I don't use hypotetical ambush match ups.
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LionClaws
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SETA222
Dec 19 2016, 02:19 PM
Quote:
 
Not even a fight. It's practically a predator-prey relationship. Spino just isn't equipped to kill animals in this size range. There's only one way it can end: an obligate psithophage bleeding out on the ground.

Do you see Spinosaurus having atleast little chance of killing T-Rex in an exceptional event? If so, how?
It's literally one-in-a-thousand, kid. This animal was heavily adapted for killing things it could swallow whole, at the expense of being able to kill anything else. Maybe, on a good day, it would be able to manage to nick some artery or something, but seeing as it had conical teeth in a longirostrine skull, it probably wouldn't have been able to do any serious bloodletting.

Spino's best hope is to use its apparent size (bout the only thing the sail was useful for, seems like, since it apparently was too thin to hold up any fat, lacked muscle scars, and didn't have the vascularization necessary for thermoregulation) to bluff its way out of a serious fight.
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Carnotaur
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I think this figth would be something alike a Gavial vs. an African Lion.Spinosaurus simply is not going to do well against a terrestrial macrophagous predator of similar size.
Edited by Carnotaur, Dec 19 2016, 09:29 PM.
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zergthe
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According to the site below, Spinosaurus aegyptiacus was actually bigger than previously thought, and deadlier, to be frank:
01542
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Ceratodromeus
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This site corroborates the above
35428
Edited by Ceratodromeus, Apr 2 2017, 12:07 PM.
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FishFossil
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Yeah, I mean it's surprising, but it's confirmed here as well:

According to the site below,
88978
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SquamataOrthoptera
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According to this, Trexs bite force was higher then originally thought.


74500
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Kiryu2012
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Apparently, recent studies of Tyrannosaurus' jaws have shown that its bite force was roughly on par with Megalodon's. You can read about it here.
229841
Edited by Kiryu2012, Apr 2 2017, 12:27 PM.
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Thalassophoneus
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Kiryu2012
Apr 2 2017, 12:25 PM
Apparently, recent studies of Tyrannosaurus' jaws have shown that its bite force was roughly on par with Megalodon's. You can read about it here.
229841
Good one. Really good one.
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Jinfengopteryx
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Guys, we don't need exactly the same joke five times!
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