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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,374 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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Godzillasaurus
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7Alx
Jul 22 2012, 06:39 PM
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.
Most definitely. Baryonichines were smaller, and had proportionally thinner jaws than those of spinosaurines. But going along with this, the tooth of an irritator (a spinosaurine) was found embedded in the bone of a South American pterosaur. So your point is valid.
Edited by Godzillasaurus, Jul 2 2013, 03:19 AM.
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Megafelis Fatalis
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theropod
Jul 22 2012, 07:08 AM
Wasn´t there once a skull estimated at 2m or even more?
Here is a Spinosaurus with a ~ 2m long skull, and Tyrannosaurus with ~ 1.6m long skull (the largest one until now)
From Wikipedia
Quote:
 
François Therrien and Donald Henderson, in a 2007 paper using scaling based on skull length, challenged previous estimates of the size of Spinosaurus, finding the length too great and the weight too small.[6] Based on estimated skull lengths of 1.5 to 1.75 meters (4.9 to 5.7 ft), their estimates include a body length of 12.6 to 14.3 meters (41 to 47 ft) and a body mass of 12 to 20.9 tonnes (13 to 23.0 short tons).

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genao87
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that spino is too small for it to weigh 12 to 20 tons. if there is a 20 ton version, i highly suspect it to be bigger.
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SpinoInWonderland
The madness has come back...
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Prehistoric Cat
Jul 22 2012, 08:01 AM
PLEASE READ FIG 2
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Kronosaurus82
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Both of those size comparisons are beyond retarded, Tyrannosaurus is SMALLER than Spinosaurus and Giganotosaurus, yes, get over it fanboys, SMALLER than Spinosaurus and Giganotosaurus...
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theropod
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Actually this T rex is smaller, it´s just far too tall, that´s what makes it look so large
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Jinfengopteryx
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ArachnidKid
Jul 22 2012, 06:42 AM
bite,I.Q.,eye sight
Better Bite=Yes
Better IQ=Yes
Better vision=it doesn't look like only Tyrannosaurus has binuclear vision: http://upload.wikimedia.org/wikipedia/commons/4/46/Suchomimus_skeleton.jpg

If Suchomimus, why not Spino?
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theropod
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yeah, spinosaurs seem to have stereoskopic vision. Quite logical, as they had to catch fish. Bettwr IQ is debatable however, it isn´t possible to say how intelligent the animals are. Some T rex fanboys always want to make it a geniums compared to other theropods, while they don´t understand that they don´t know anything about it.
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Jinfengopteryx
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Well, many scientists agree, it was smart.
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theropod
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So far I haven´t read any scientist stating something like T rex being smarter than other theropods. scientists don´t arrogate to themselfes that they´d know an animal being smarter, jsut from studying it´s brain size.
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Jinfengopteryx
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The big Cerebellum seems to be a fact, made up by COTD, however they also suggest it, because it was a coelurosaur and lived later.
However, I'm not uite sure who would win this battle, but I think it is allowed to favour a 18m carnivoran over a 12m one, but scientists don't think so, so I'm unsure.
Edited by Jinfengopteryx, Aug 4 2012, 05:15 AM.
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theropod
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scientists also don´t give explanations about a fight that would never happen, and remember, there are ones that don´t have a proper size scale in mind and say what just comes to mind

Rexy had a big cerebellum, but that is not necessary an indicator for greater intelligence. of course the numbers popular websites often give are irrelevent, because the whole brain size includes the olfactory lobes.
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Jinfengopteryx
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I also wonder why they discuss it, maybe because they're pissed of JPIII.
Or simply because, everybody wants to know who would win this battle, because tey watched JPIII and want to know who would really win.
I think these scientists just want somme attention, so they discuss it.
Here, we also a lot discuss of animal battles that won't happen.
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theropod
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True, but if I had studied palaeontology, I wouldn´t bother giving a statment about such a battle.
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Carcharadon
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Rexy wins
I don't think I need to tell why, unless someone wants me to
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Megafelis Fatalis
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Spinosaurus "Old Skeletal" ~ 2m skull - Spinosaurus "New and accurate Skeletal" ~ 2m skull - Tyrannosaurus ~ 1.5m skull - Giganotosaurus ~ 1.9m skull - Carcharodontosaurus ~ 1.6m skulll

Notes:
1- Open Image in a new tab to see better
2- Giganotosaurus' skull should 5cm longer
3- Carcharodontosaurus' tail should be a little longer

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