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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,255 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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TheROC
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Basilisk Lizards have some sort of sail on their back, what do their neural spines look like?

Anyone have a skeleton?
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Black Ice
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TheROC
Jan 31 2013, 01:29 PM
Basilisk Lizards have some sort of sail on their back, what do their neural spines look like?

Anyone have a skeleton?
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From the outlining they look thin like dimetrodons.
Edited by Black Ice, Jan 31 2013, 01:32 PM.
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MightyMaus
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Black Ice
Jan 31 2013, 01:21 PM
MightyMaus
Jan 31 2013, 01:19 PM
Black Ice
Jan 31 2013, 01:11 PM
Godzillaman
Jan 31 2013, 12:58 PM
Black Ice
Jan 31 2013, 12:55 PM
GM- You can't just group the thing on spinos back into either a hump,sail,or ridge, It doesn't work that way.
But it is most likely a muscular ridge out of the three.
On what basis? You keep repeating the same thing. I just CLEARLY explained the whole neural spine deal here and you keep saying it's a ridge most likely?
What do you propose as a better alternative???

IMO the structure is a thin fleshy ridge, that transitions to a thick sail at the top. Roughly 1.5 times as wide as the Planet Dinosaur reconstruction.
Have you seen the spines? They aren't thick at the front. If spino had a muscled ridge, The bones would bend, however a 15t animal doesn't need extra strength to yank a 2t fish out the water. If you read from page 120 on, I explained all of this very clearly.

GM- If you take the time to read brolys previous posts he CLEAERLY agrees with what I said on it not being certain it was a ridge.

EDIT: I keep ninjaing broly lol
Did you answer the damn question? WHat do you think the structure was...if you can't think of something, you can't deny my assumption.
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Black Ice
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MightyMaus
Jan 31 2013, 01:32 PM
Black Ice
Jan 31 2013, 01:21 PM
MightyMaus
Jan 31 2013, 01:19 PM
Black Ice
Jan 31 2013, 01:11 PM
Godzillaman
Jan 31 2013, 12:58 PM
Black Ice
Jan 31 2013, 12:55 PM
GM- You can't just group the thing on spinos back into either a hump,sail,or ridge, It doesn't work that way.
But it is most likely a muscular ridge out of the three.
On what basis? You keep repeating the same thing. I just CLEARLY explained the whole neural spine deal here and you keep saying it's a ridge most likely?
What do you propose as a better alternative???

IMO the structure is a thin fleshy ridge, that transitions to a thick sail at the top. Roughly 1.5 times as wide as the Planet Dinosaur reconstruction.
Have you seen the spines? They aren't thick at the front. If spino had a muscled ridge, The bones would bend, however a 15t animal doesn't need extra strength to yank a 2t fish out the water. If you read from page 120 on, I explained all of this very clearly.

GM- If you take the time to read brolys previous posts he CLEAERLY agrees with what I said on it not being certain it was a ridge.

EDIT: I keep ninjaing broly lol
Did you answer the damn question? WHat do you think the structure was...if you can't think of something, you can't deny my assumption.
Either you're stupid (which I doubt) Or you didn't comprehend my reply (which is sad)
Read it again. I even highlighted the part for you.
Edited by Black Ice, Jan 31 2013, 01:51 PM.
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MightyMaus
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Black Ice
Jan 31 2013, 01:34 PM
MightyMaus
Jan 31 2013, 01:32 PM
Black Ice
Jan 31 2013, 01:21 PM
MightyMaus
Jan 31 2013, 01:19 PM
Black Ice
Jan 31 2013, 01:11 PM
Godzillaman
Jan 31 2013, 12:58 PM
Black Ice
Jan 31 2013, 12:55 PM
GM- You can't just group the thing on spinos back into either a hump,sail,or ridge, It doesn't work that way.
But it is most likely a muscular ridge out of the three.
On what basis? You keep repeating the same thing. I just CLEARLY explained the whole neural spine deal here and you keep saying it's a ridge most likely?
What do you propose as a better alternative???

IMO the structure is a thin fleshy ridge, that transitions to a thick sail at the top. Roughly 1.5 times as wide as the Planet Dinosaur reconstruction.
Have you seen the spines? They aren't thick at the front. If spino had a muscled ridge, The bones would bend, however a 15t animal doesn't need extra strength to yank a 2t fish out the water. If you read from page 120 on, I explained all of this very clearly.

GM- If you take the time to read brolys previous posts he CLEAERLY agrees with what I said on it not being certain it was a ridge.

EDIT: I keep ninjaing broly lol
Did you answer the damn question? WHat do you think the structure was...if you can't think of something, you can't deny my assumption.
Either you're stupid (which I doubt) Or you didn't comprehend my reply (which is sad)
Read it again. I even highlighted the part for you.
Just write down the words..it's not hard... I am looking for a one word answer!
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MysteryMeat
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brolyeuphyfusion
Jan 31 2013, 11:00 AM
Jinfengopteryx
Jan 31 2013, 02:43 AM
But maybe the sail indeed was just an equivalent to Elephant ears.
That's even more unlikely than a Dimetrodon-like sail...elephant ears can be moved and have no bones, Spinosaurus can't even move it's spines and has broad bones in it!

And again, a sail is the least likely...
I think you misunderstood him completely...
Jinfeng meant sail could have had thermo regulatory properties like elephant ears, not fanning like ears...
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SpinoInWonderland
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MysteryMeat
Jan 31 2013, 02:04 PM
brolyeuphyfusion
Jan 31 2013, 11:00 AM
Jinfengopteryx
Jan 31 2013, 02:43 AM
But maybe the sail indeed was just an equivalent to Elephant ears.
That's even more unlikely than a Dimetrodon-like sail...elephant ears can be moved and have no bones, Spinosaurus can't even move it's spines and has broad bones in it!

And again, a sail is the least likely...
I think you misunderstood him completely...
Jinfeng meant sail could have had thermo regulatory properties like elephant ears, not fanning like ears...
The issue with that is that it's not likely to be a sail at all...

Why is it that people try to keep defending the sail above all others?
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SpinoInWonderland
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Also, a sail would have absorbed more heat than it radiated...
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theropod
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Please guys, it is not that difficult to comprehend that this is largely a matter of speculation and preference.
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Grey
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One part of the next publication is about the vertebras, I guess Ibrahim will discuss the problematic of the spines. The Milan model allegedly based on this displays a sail whatever.
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SpinoInWonderland
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Grey
Jan 31 2013, 08:31 PM
The Milan model allegedly based on this displays a sail whatever.
Just because it displays that doesn't mean it's true. The model should only be used for proportions, NOT what the creature actually looked like.
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SpinoInWonderland
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A true sailback would have thin rods not broad spines, that's what the sail-supporters fail to understand...

The milan model is not based off a mummy...and even it's proportions are highly questionable, looking at relatives. It is very unlikely that the short legs belonged to an MSNM V4047-sized specimen...
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Grey
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brolyeuphyfusion
Jan 31 2013, 08:53 PM
Grey
Jan 31 2013, 08:31 PM
The Milan model allegedly based on this displays a sail whatever.
Just because it displays that doesn't mean it's true. The model should only be used for proportions, NOT what the creature actually looked like.
Do you read posts from others ?

This model is based on the works on going we are waiting.
Perhaps it will be confirmed, perhaps not.
You don't know actually about that part, you speculate like all of us.
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theropod
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the model also displays the animal at a specific color it might not have had either, it being displayed doesn´t imply there is any reason to believe it. The facts are, it is not known and mere speculation.
The spinous processes of the holotype are lost and cannot be examined. Unless they made substantial new findings of vertebrae, there is no material to suggest anything that has more weight than the already proposed speculations.
That model is just a model in many, I too know a model of Arizonasaurus that displays the structure as a crest/ridge, that doesn´t necessarily mean it has any credential in this regard.
As long as there is no info an whether there is actual new information or whether it is just hypothesis, I don´t think the model is important in this regard
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Grey
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The model is important in my opinion because it is based on an study in progress.
Dal Sasso describes the limbs, Ibrahim the vertebras.

Of course it is not finished yet so we can expect updates until it is done.
I wonder why they made the model even before they've completed their work.

But it has not to be undermined even now, nor taken to be a fact either.
This is not a model from deviantart but from the actual guys working on it, so they have my trust until it is finally published.

Regarding the color, that's not important and a factor of its technical and scientific accuracy, but I don't have any problem with that particular color.
Edited by Grey, Jan 31 2013, 10:13 PM.
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