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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,087 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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Thalassophoneus
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Pelagic Killer
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I'm sure that FishFossil has missed the like button a lot.

Some express doubts that MSNM-V4047 belonged to Spinosaurus stating that it wouldn't fit on the holotype's lower jaw. But personally I wouldn't agree as they do seem to fit really well together.

And no, I'm still not convinced that the shape of the mandible implies an abnormaly wide jaw.
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Ausar
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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Huh? What? Who said what now?

Oh......mkay.
Uhhh......I trust you all know my thoughts here.
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blaze
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The 6-7t estimate is for MSNM-V4047 and is a volumetric estimate based on the most recent reconstruction from 2014, there's no getting around that.
Edited by blaze, Jan 12 2016, 07:44 AM.
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Thalassophoneus
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blaze
Jan 12 2016, 07:40 AM
The 6-7t estimate is for MSNM-V4047 and is a volumetric estimate based on the most recent reconstruction from 2014, there's no getting around that.
Thank you for correcting me.
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genao87
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Mantrid
Jan 12 2016, 12:56 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.
FishFossil found a study published a few days ago that doubts the quadruped Spinosaurus.

I suspect that the quadruped Spinosaurus might be proven false.
oh good, i dont believe that 6-7 ton estimate to begin with and also so low to the ground that it makes it quad type walking dino. people didn't accepted the estimates that made Spino a huge land dino. so im not accepting this. i agree with scott hartman on his analysis with this low quad type Spino.
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Drift
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genao87
Feb 10 2016, 02:03 PM
Mantrid
Jan 12 2016, 12:56 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.
FishFossil found a study published a few days ago that doubts the quadruped Spinosaurus.

I suspect that the quadruped Spinosaurus might be proven false.
oh good, i dont believe that 6-7 ton estimate to begin with and also so low to the ground that it makes it quad type walking dino. people didn't accepted the estimates that made Spino a huge land dino. so im not accepting this. i agree with scott hartman on his analysis with this low quad type Spino.
They didn't accept those estimates because of their lack of disdain for sensationalist optimism,Rather than accepting assumptions based off of little to no fossil evidence they refute grand claims until provided with evidence to suggest otherwise.
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Ragnarr
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If the 15 meters adult Spinosaurus would be indeed 6-7 tonnes and if the reconstruction (beside the debate about the actual stance) as gracilish is accurate, Tyrannosaurus would overpower it.

If Hartman 2013 reconstruction turned out to be closer to the actual animal (we never know with this problematic case), the outcome would probably somewhat differ.
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genao87
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Ragnarr
Feb 29 2016, 03:04 PM
If the 15 meters adult Spinosaurus would be indeed 6-7 tonnes and if the reconstruction (beside the debate about the actual stance) as gracilish is accurate, Tyrannosaurus would overpower it.

If Hartman 2013 reconstruction turned out to be closer to the actual animal (we never know with this problematic case), the outcome would probably somewhat differ.
Somewhat different? That Spino would be too big too strong.
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Mars
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Posted Image Ill just sit back and wait for people to rage on me for posting this . B-)
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Thalassophoneus
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RaptorAttack
Jul 6 2016, 05:26 PM
Posted Image Ill just sit back and wait for people to rage on me for posting this . B-)
Jurassic Park cannot be considered a good source of the outcome. Mainly because it is a film with a standard plot whereas here we are talking about who has more chances of winning. In films there are no chances of who will win. This is part of the plot.

Not to mention scientific innacuracy.
Edited by Thalassophoneus, Jul 6 2016, 05:58 PM.
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Mars
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It was just as a joke
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LeonardosHeir
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I want to revive this conflict and start back up the war shall we?
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bone crusher
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The war is over the moment Spino is made a quadruped and downsized to 6-7t. Not only does t-rex enjoy a far better height advantage, the larger specimens are a good deal heavier.
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Ceratodromeus
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ugh, nevermind this thing .
Edited by Ceratodromeus, Jul 30 2016, 05:22 AM.
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SETA222
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EDIT: Old retarded post, bullfaeces
Edited by SETA222, Dec 19 2016, 01:18 PM.
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