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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,088 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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Thalassophoneus
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Pelagic Killer
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Jaws
Nov 30 2015, 02:36 PM
SamuelwithDinos
Nov 30 2015, 12:05 PM
Are you talking about the 9 ton one?^
Yes Im talking about FMNH PR 2081
This is Sue. We know how big she is.
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Jaws
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Mantrid
Nov 30 2015, 10:43 PM
Jaws
Nov 30 2015, 02:36 PM
SamuelwithDinos
Nov 30 2015, 12:05 PM
Are you talking about the 9 ton one?^
Yes Im talking about FMNH PR 2081
This is Sue. We know how big she is.
TBH I don't know why you don't think this is a mismatch in favor of Tyrannosaurus: I still think T.rex wins 97/3
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The supersaurus
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Wait, so is Sue 6 tons or 9 tons?
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Spinodontosaurus
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All recent volumetric mass estimates place Sue at over 8,000 kg (8.8 short tons).
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Grimace
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100/0 in favor of trex since spinosaurus was completely immobile on land
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Thalassophoneus
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Grimace
Dec 2 2015, 08:10 PM
100/0 in favor of trex since spinosaurus was completely immobile on land
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WTF???

it needs 5 words at least
This image is just ugly!
Edited by Thalassophoneus, Dec 2 2015, 10:36 PM.
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Wombatman
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If Spinosaurus had lived on a colder and saltwater environment, that wouldnt be so impossible. Well and if that skeleton didnt lack its LEGS
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Vivyx
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I honestly think that the only winner I can see on land is Tyrannosaurus. It just has too much of an environmental advantage (what I mean by this is that it is suited for the environment that the fight will usually be taken place in, which will be land) along with better weaponry.
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Coelophysoid
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Tyrannosaurus was hunting armored prey, that was smaller than T.Rex. This means Tyrannosaurus has never experienced to see something larger than another t'rex, so it wouldn't really be ready to take down a spinosaurus. At that time, spinosaurus lived alongide with larger dinosaurs(Paralititan). To win? Tyrannosaurus has to raise it's heavy head high enough to reach the head\neck\back of Spinosaurus. If it attempts to attack the legs, it will be attacked from above. And finally, the only weapon that a T.Rex can use is it's head, when Spinosaurus has arms as well. Obviously, Spinosaurus would win(but if spinosaurus was less than 16 - 17 m. in length, Tyrannosaurus would stand a chance
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Spartan
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Spinosaurus was just a little bit larger than Triceratops. T. rex itself was also larger than Spinosaurus so it would have seen larger theropods all the time. You also forgot Alamosaurus, one of the largest creatures to ever walk the earth. Even if the pelican posture was right Spinosaurus' head shouldn't be much higher than that of T. rex.
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Thalassophoneus
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Spartan
Jan 12 2016, 12:53 AM
Spinosaurus was just a little bit larger than Triceratops. T. rex itself was also larger than Spinosaurus so it would have seen larger theropods all the time. You also forgot Alamosaurus, one of the largest creatures to ever walk the earth. Even if the pelican posture was right Spinosaurus' head shouldn't be much higher than that of T. rex.
FishFossil found a study published a few days ago that doubts the quadruped Spinosaurus.

I suspect that the quadruped Spinosaurus might be proven false.
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Coelophysoid
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Spartan
Jan 12 2016, 12:53 AM
Spinosaurus was just a little bit larger than Triceratops. T. rex itself was also larger than Spinosaurus so it would have seen larger theropods all the time. You also forgot Alamosaurus, one of the largest creatures to ever walk the earth. Even if the pelican posture was right Spinosaurus' head shouldn't be much higher than that of T. rex.
T-Rex larger than spinosaurus? Have I missed a few new discoveries since 2013?
Edited by Coelophysoid, Jan 12 2016, 01:02 AM.
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Spartan
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Mantrid
Jan 12 2016, 12:56 AM
I suspect that the quadruped Spinosaurus might be proven false.
I always thought so.


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T-Rex larger than spinosaurus? R u kidding or I missed a few new discoveries since 2013?



You missed A LOT. You should at least read the Ibrahim et al paper from 2014, Scott Hartman's response and the response of the authors.
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Thalassophoneus
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Coelophysoid
Jan 12 2016, 01:02 AM
Spartan
Jan 12 2016, 12:53 AM
Spinosaurus was just a little bit larger than Triceratops. T. rex itself was also larger than Spinosaurus so it would have seen larger theropods all the time. You also forgot Alamosaurus, one of the largest creatures to ever walk the earth. Even if the pelican posture was right Spinosaurus' head shouldn't be much higher than that of T. rex.
T-Rex larger than spinosaurus? Have I missed a few new discoveries since 2013?
Spinosaurus is most probably the longest theropod. The holotype has been estimated at somewhere between 14 and 15 m., a length hardly surpassed by other theropods, while MSNM-V4047, which is considered by some a rather dubious specimen, was probably over 15 m. long. It is the specimen upon which the 18 m. estimates are based, but it is now suggested that it was most probably less than 17 m. long.

It's mass is probably around equal or a bit smaller. A mass of 6-7 tons has been suggested, but if you take MSNM-V4047 the mass might be higher, between 8 and 10 t. Tyrannosaurus was 9 t., according to recent estimates that are based on "Sue".
Edited by Thalassophoneus, Jan 12 2016, 01:23 AM.
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Spartan
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You should say him that MSNM V4047 is generally not viewed as a Spinosaurus aegyptiacus, but that you disagree with that notion.
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