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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,338 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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Than I can't help you, I have it above Homepage URL.
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Verdugo
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Jinfengopteryx
Sep 28 2012, 03:32 AM
Than I can't help you, I have it above Homepage URL.
Maybe i need to have 2000 + posts to have that option.
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Jinfengopteryx
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Well, broly was able to use it, when he had less than 2000.
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Carcharadon
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Jinfengopteryx
Sep 28 2012, 04:26 AM
Well, broly was able to use it, when he had less than 2000.
I managed to do it too.
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Carcharadon
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Also, that Planet Dino Spinosaurus pic that verdugo found for the OP is definetly the best :D
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Verdugo
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Dark allosaurus
Sep 28 2012, 10:01 AM
Also, that Planet Dino Spinosaurus pic that verdugo found for the OP is definetly the best :D
Of course, that is the best PD picture i can find :D . I see you use as your signature.
But i don't know how long it will take for that picture to be officially used for the OP  :'(
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theropod
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veeeeery long, not even all maniraptoran pics show the animals with feathers...
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Verdugo
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theropod
Sep 29 2012, 01:44 AM
veeeeery long, not even all maniraptoran pics show the animals with feathers...
I think we should make a request to @DinoMike. The OP pics really need a BIG update :angry:
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theropod
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There are enough people who draw accurate reconstructions, finding enough images shouldn´t be a problem actually. DinoMike: if you don´t find an accurate picture you can tell me and I can try to do one if you want.
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Carcharadon
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Verdugo
Sep 28 2012, 03:11 PM
Dark allosaurus
Sep 28 2012, 10:01 AM
Also, that Planet Dino Spinosaurus pic that verdugo found for the OP is definetly the best :D
Of course, that is the best PD picture i can find :D . I see you use as your signature.
But i don't know how long it will take for that picture to be officially used for the OP  :'(
Thanks but its not on my signature anymore
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SpinoInWonderland
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I have made a video explaining why Spinosaurus is the victor.

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Verdugo
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brolyeuphyfusion
Oct 3 2012, 11:46 PM
I have made a video explaining why Spinosaurus is the victor.

Nice video, i think it would be better if you sit and talk, explain and discuss in person :)

But do you think it is necessary ??

I attempted to click thumb down, but it doesn't deserve my effort :)
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SpinoInWonderland
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Verdugo
Oct 3 2012, 11:58 PM
brolyeuphyfusion
Oct 3 2012, 11:46 PM
I have made a video explaining why Spinosaurus is the victor.

Nice video, i think it would be better if you sit and talk, explain and discuss in person :)

But do you think it is necessary ??

I attempted to click thumb down, but it doesn't deserve my effort :)
It is very necessary, fanboys like Palaeosaurus are annoying and can't comprehend the fact that Tyrannosaurus isn't the biggest and baddest

And I like it better that way. I don't like revealing myself in person :D
Edited by SpinoInWonderland, Oct 4 2012, 12:14 AM.
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Gecko
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You know the more and more I read about Spinosaurus, the more and more I doubt it's size advantage. (It did have one but it's not as big as some would think...)

Have you read this blog post comparing the Spinosaurus holotype to Sue. I used google translate so you can kind of read it, and get the idea of it.

Take a look at the images:
Link
Link

Sue is way more robust and comparable in size to Spinosaurus(Sue appears to at least weigh more than the holotype, I'm not sure about the bigger Spinosarus skull but I imagine it wouldn't be much bigger than Sue)
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theropod
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then I guess you are imagining it not as it is. the spinosaurus holotype is merely 13-14m long and it is sub-adult. The dal-sasso specimen is acknowledged to have been much bigger.

interesting images, but imagine a spinosaurus which is 30% bigger in linear dimensions and 2,2 times the weight...
Edited by theropod, Oct 4 2012, 12:58 AM.
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