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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,119 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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Aelurodon taxoides
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Why does everyone use Sue for t.Rex? I thought the average t.Rex was closer to 30 feet than 40.Apologies if I am mistaken but it seems unfair to us the largest tyrannosaurs specimen.
Edited by Aelurodon taxoides, Apr 9 2015, 12:35 AM.
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Fist of the North Shrimp
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Why use the specimen from Milan?
And the average T. Rex is somewhat larger than 30 feet .
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Aelurodon taxoides
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Alright, I wasn't sure.
Shouldn't the spinosaur image be updated?
Edited by Aelurodon taxoides, Apr 9 2015, 03:16 AM.
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theropod
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Aelurodon taxoides
Apr 9 2015, 12:34 AM
Why does everyone use Sue for t.Rex? I thought the average t.Rex was closer to 30 feet than 40.Apologies if I am mistaken but it seems unfair to us the largest tyrannosaurs specimen.
30ft is more of a subadult. The smallest adults I’m aware of (B-rex) are somewhere around 10m. The average seems to be closer to 36ft based on typical femur sizes, however it has to be kept in mind that the average is additionally less robust than sue.

You have to figure in other specimens of Spinosaurus too. The Spinosaurus holotype and the material of "S. marocannus" and Sigilmassasaurus are not as large as MSNM v4047 (the rostrum described in 1998 could be an approximate match for the holotype, which is likely an adult, the rest is smaller, but its ontogenetic status is unknown), and if Russell (1996)’s giant humerus is Spinosaurus, as referred by Ibrahim et al, (2014), then that’s another specimen of comparable size.
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Ceratodromeus
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Just how large those Spinosaurus individuals are, though, is a point of contension.

If the average Tyrannosaurus weighs ~7 tons, and you take the supposed 6-7 ton estimate for Spinosaurus, we have a match up much closer then thought in previous years.
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Drift
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Aelurodon taxoides
Apr 9 2015, 02:30 AM
Alright, I wasn't sure.
Shouldn't the spinosaur image be updated?
I agree, the image must be adjusted since the evidence of its correct anatomical posture will accurately depict the animal.No use keeping the outdated guesstimates.
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Grimace
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I say the new spino has a better chance. Its low to the ground, and could brace itself with it's arms.
I could see it grabbing the rex and yanking it down
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Darker
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I'd say by sheer size and claw-striking force the Spino would win. It towers over the Rexie and it's far more massive and savage while the Rexie is just raw power, who usually goes against smaller dinosaurs while Spino had no trouble dealing with dudes that were just as big or maybe even bigger.

If a bite is the only thing that determines Spino losing, I think Rexie will have a hard time trying to get to the Spino's neck. And those claws can do a serious amount of damage. If they can cut an 8-meter long fish like it was butter then imagine what it would do to a dinosaur. The bones are tougher, but the flesh isn't.
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Creeper
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From what I understand, the spinosaurus is far from "towering" over any of the other large theropods.

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Darker
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Apr 26 2015, 03:42 PM
From what I understand, the spinosaurus is far from "towering" over any of the other large theropods.

Posted Image
I wasn't talking about that new redesign, but the old model
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maker
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The old model Spinosaurus wins easily, it can knock down the unbalanced vertical Tyrannosaurus in seconds.
But seriously, interspecific conflict uses the latest description of the combatants.
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Wombatman
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But the old Spinosaurus model is incorrect. Is like using tail dragging 15 m T-rex instead of the current
Edited by Wombatman, Apr 26 2015, 08:41 PM.
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Ausar
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Darker
Apr 26 2015, 05:14 PM
Creeper
Apr 26 2015, 03:42 PM
From what I understand, the spinosaurus is far from "towering" over any of the other large theropods.

Posted Image
I wasn't talking about that new redesign, but the old model
Erm, why exactly?
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Creeper
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Darker
Apr 26 2015, 05:14 PM
Creeper
Apr 26 2015, 03:42 PM
From what I understand, the spinosaurus is far from "towering" over any of the other large theropods.

Posted Image
I wasn't talking about that new redesign, but the old model
In that case I am totally using Kangaroo Rex, tail bounce double bicycle kick FTW!
especially against this guy...

Posted Image

but seriously, the most scientifically up to date info is what we usually go with here. We do have battles in the scifi/fantasy section with debates using outdated dinos and "fanboy" versions of popular animals.
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Choeradodis
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Darker, the claws probably didn't have very sharp edges. They were more hook-like for catching and maybe wrestling with large fish underwater like Mawsonia and Onchopristis (which, even though apparently smaller than 7 meters, was still large). I kind of imagine Spinosaurus as hunting like an otter :)

But still, arms wouldn't really have a major role in this fight. Tyrannosaurus would be much taller and Spinosaurus's head and neck would have much more range, power, speed, and less situational. Posted Image It'd be very hard for Spinosaurus to use its arms as weapons against a significantly taller opponent like Tyrannosaurus

Just in case anyone is curious:

Grizzly bear claw: Posted Image
Spinosaurus claw: Posted Image
(Try to imagine the keratin onto that one ;) )

EDIT: Also Darker, there's no evidence whatsoever for Spinosaurus being a macropredator.

Edited by Choeradodis, Apr 27 2015, 04:06 AM.
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