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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,373 Views)
Wolf Eagle
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M E G A P H Y S E T E R
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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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Replies:
SpinoInWonderland
The madness has come back...
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Dark allosaurus
Aug 8 2012, 12:45 AM
Rexy wins
I don't think I need to tell why, unless someone wants me to
Previous posts...read them...
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SpinoInWonderland
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Prehistoric Cat
Aug 8 2012, 12:46 AM
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

Posted Image
Did you happen to fail one of the rules in making size comparison images?...Tyrannosaurus rex MUST be smaller than Spinosaurus, Giganotosaurus, and Carcharodontosaurus...follow that rule for more accurate, non-fanboyish size comparisons...
never mind...
Edited by SpinoInWonderland, Aug 8 2012, 12:51 AM.
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Megafelis Fatalis
Carnivore
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brolyeuphyfusion
Aug 8 2012, 12:50 AM
Did you happen to fail one of the rules in making size comparison images?...Tyrannosaurus rex MUST be smaller than Spinosaurus, Giganotosaurus, and Carcharodontosaurus...follow that rule for more accurate, non-fanboyish size comparisons...
never mind...
As i wrote, Tyrannosaurus 1.5m long skull - Spinosaurus 2m long skull - Giganotosaurus 1.9m long skull - Carcharodontosaurus 1.6m long skull.
Why don't you use Scott Hartman skeletals and do the same thing ??
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SpinoInWonderland
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Prehistoric Cat
Aug 8 2012, 12:54 AM
brolyeuphyfusion
Aug 8 2012, 12:50 AM
Did you happen to fail one of the rules in making size comparison images?...Tyrannosaurus rex MUST be smaller than Spinosaurus, Giganotosaurus, and Carcharodontosaurus...follow that rule for more accurate, non-fanboyish size comparisons...
never mind...
As i wrote, Tyrannosaurus 1.5m long skull - Spinosaurus 2m long skull - Giganotosaurus 1.9m long skull - Carcharodontosaurus 1.6m long skull.
Why don't you use Scott Hartman skeletals and do the same thing ??
Do we even have a complete Spinosaurus skull?
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Jinfengopteryx
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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brolyeuphyfusion
Aug 8 2012, 01:01 AM
Prehistoric Cat
Aug 8 2012, 12:54 AM
brolyeuphyfusion
Aug 8 2012, 12:50 AM
Did you happen to fail one of the rules in making size comparison images?...Tyrannosaurus rex MUST be smaller than Spinosaurus, Giganotosaurus, and Carcharodontosaurus...follow that rule for more accurate, non-fanboyish size comparisons...
never mind...
As i wrote, Tyrannosaurus 1.5m long skull - Spinosaurus 2m long skull - Giganotosaurus 1.9m long skull - Carcharodontosaurus 1.6m long skull.
Why don't you use Scott Hartman skeletals and do the same thing ??
Do we even have a complete Spinosaurus skull?
No, but I doubt it was bigger than 2m, still I think 18m are accurate, I can't imagine it having a bigger head/body ratio than Suchomimus, for the reasons stated before.
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Jinfengopteryx
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theropod
Aug 4 2012, 05:12 AM
Rexy had a big cerebellum
I were talking about Cerebrum(Part of the brain for intelligence), NOT cerebellum(Part for muscels).
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Jinfengopteryx
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brolyeuphyfusion
Aug 8 2012, 12:50 AM
Tyrannosaurus rex MUST be smaller than Spinosaurus, Giganotosaurus, and Carcharodontosaurus...follow that rule for more accurate, non-fanboyish size comparisons...
I think he took lower estimates for the Carnosaurs and Spinosaurus, so he does not have to be smaller, at leat not a lot.
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SpinoInWonderland
The madness has come back...
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Jinfengopteryx
Aug 8 2012, 01:28 AM
brolyeuphyfusion
Aug 8 2012, 12:50 AM
Tyrannosaurus rex MUST be smaller than Spinosaurus, Giganotosaurus, and Carcharodontosaurus...follow that rule for more accurate, non-fanboyish size comparisons...
I think he took lower estimates for the Carnosaurs and Spinosaurus, so he does not have to be smaller, at leat not a lot.
Taking the higher estimate for T. rex, while taking the lower estimate for the carnosaurs and Spinosaurus, is biased, there is no way around that rule
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Jinfengopteryx
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The lowest estimates for an adult Tyrannosaurus are 12m, they're not debunked, because we have a skeleton, more than 95% complete(Sue). You can't say the same to the Carnosaurs and Spinosaurus.
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SpinoInWonderland
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Jinfengopteryx
Aug 8 2012, 01:34 AM
The lowest estimates for an adult Tyrannosaurus are 12m, they're not debunked, because we have a skeleton, more than 95% complete(Sue). You can't say the same to the Carnosaurs and Spinosaurus.
But your comparison must NOT be fanboyish, so compare liberal to liberal, conservative to conservative, babies to babies, etc...
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Carcharadon
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brolyeuphyfusion
Aug 8 2012, 01:36 AM
But your comparison must NOT be fanboyish, so compare liberal to liberal, conservative to conservative, babies to babies, etc...
how is it fanboyish if someone just made T.rex larger than Carcharo/Giga in a comparison without being a fanboy?!?
Edited by Carcharadon, Sep 10 2012, 03:37 AM.
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Megafelis Fatalis
Carnivore
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Jinfengopteryx
Aug 8 2012, 01:25 AM
brolyeuphyfusion
Aug 8 2012, 01:01 AM
Prehistoric Cat
Aug 8 2012, 12:54 AM
brolyeuphyfusion
Aug 8 2012, 12:50 AM
Did you happen to fail one of the rules in making size comparison images?...Tyrannosaurus rex MUST be smaller than Spinosaurus, Giganotosaurus, and Carcharodontosaurus...follow that rule for more accurate, non-fanboyish size comparisons...
never mind...
As i wrote, Tyrannosaurus 1.5m long skull - Spinosaurus 2m long skull - Giganotosaurus 1.9m long skull - Carcharodontosaurus 1.6m long skull.
Why don't you use Scott Hartman skeletals and do the same thing ??
Do we even have a complete Spinosaurus skull?
No, but I doubt it was bigger than 2m, still I think 18m are accurate, I can't imagine it having a bigger head/body ratio than Suchomimus, for the reasons stated before.
Using the Old Skeletal, a Spinosaurus with 2m long skull would be ~16.5m long, Using the New Skeletal a Spinosaurus with 2m long skull would be ~ 15m long. The average skull for Spinosaurus is between 1.5m-1.75m long.
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Grey
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Prehistoric Cat,

I need updates.

I saw The ROC models from Hartman, and it seemed clear that Spinosaurus was bigger than what you say. BTW, I didn't saw your last comparison.

Hartman has updated Spinosaurus skeletal model ?

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Megafelis Fatalis
Carnivore
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Grey
Aug 8 2012, 01:22 PM
Prehistoric Cat,

I need updates.

I saw The ROC models from Hartman, and it seemed clear that Spinosaurus was bigger than what you say. BTW, I didn't saw your last comparison.

Hartman has updated Spinosaurus skeletal model ?

I used the new one and the old one, and both have a 2m long skull:
IMAGE
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theropod
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The problem is that those skeletons both show a proportionally larger skull than indicated by Suchomimus
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