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| Spinosaurus aegyptiacus v Tyrannosaurus rex | |
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| Tweet Topic Started: Jan 7 2012, 02:16 AM (459,341 Views) | |
| Wolf Eagle | Jan 7 2012, 02:16 AM Post #1 |
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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. ![]() 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).
Edited by Taipan, Apr 24 2015, 10:10 PM.
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| Fragillimus335 | Sep 25 2012, 05:23 AM Post #601 |
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Omnivore
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If we apply a similar total skull to midline skull measurement form Sue to Spinosaurus, 1.53/1.395=1.1 1.1x1.75=1.925 meters for Spinosaurus's maximim skull measurement. |
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| TheROC | Sep 25 2012, 05:28 AM Post #602 |
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Herbivore
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May I have a link to that paper? http://palaeoblog.blogspot.com/2006/04/new-biggest-t-rex-skull.html According to that, skull measurements are from the 'snout to the back of its skull'. And it also lists Sue's measurement at 55.4 inches long, which is 1.4 meters. The guy I was using as a reference in the picture is not closer to the camera, look at his feet, and you'll see his feet are further in than the outer edge of the platform Sue stands on. Your picture is even better though, you mind showing me the link to the original without the photoshop blend mode? ![]() It illustrates my point better. The guy on the ladder is behind Sue's foot, meaning he's looks slightly smaller than he should. He's on the other side of the ladder as well. But even still if you stack up 2 of him from where the flat of T.Rex's foot is, two of him would still be taller than Sue's hip height; If Sue's height is meant to be even 3.6 meters tall in that crouched position, then that guy would be over 2 meters tall. It gets even worse if Sue is meant to be 3.8 meters in such a stance. And yet he's not even the tallest guy there. If the guy is only 5'11" as you propose, then Sue would be well under 12 feet at the hip in that photo. Edited by TheROC, Sep 25 2012, 05:28 AM.
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| Jinfengopteryx | Sep 25 2012, 05:43 AM Post #603 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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How much of the skull was found, because the blog says only fragments were found, however, maximia and dentary are both shorter, than in Sue. |
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| Gecko | Sep 25 2012, 06:18 AM Post #604 |
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Autotrophic Organism
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Here's the paper but you have to log in to see it. I can't log you in but *cough cough*... I scaled the people to 1.8 m which is around 5'11. Sue is also standing on the tips of her toe's in shartmans skeletal in the photographs she's got 2, almost 3 toes on the ground. If the picture had Sue in the same pose as shartmans skeletal it would be around 3.8 m at the hip. Here's the link to the picture. ![]() If you use the scale bar in Shartman's skeletal it matches perfectly with the scale bar images from Brochus paper. ![]() @Fragillimus335 it's possible it could be applied the same way but the Spinosaurus skull is incomplete and using the scale bar in the Dal Sasso paper the 1.75 m measurement is from the side of the skull. |
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| theropod | Sep 25 2012, 06:25 AM Post #605 |
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palaeontology, open source and survival enthusiast
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thanks, that is clearing up thsoe two figures. and it explains why MOR 008 has 1,5m of skull measurement when it´s maxilla and dentary are so much shorter than sue. so back to the 1,53m T. rex skull... |
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| Gecko | Sep 25 2012, 08:18 AM Post #606 |
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Autotrophic Organism
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I took the image from the 12.29 m Sue paper and scaled it to the 12.29 m length and rotated the legs to a more natural pose and she's still 3.4 m at the hips with no flesh on her.
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| SpinoInWonderland | Sep 25 2012, 02:13 PM Post #607 |
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The madness has come back...
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Btw guys, the Spinosaurus in the Planet Dinosaur Size Comparison Screenshots is more like ~15 meters long...they were showing a ~15-meter long animal in the comparisons, and presenting it as 17-meters long! |
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| theropod | Sep 25 2012, 10:33 PM Post #608 |
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palaeontology, open source and survival enthusiast
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many documentaries do the same to megalodon (prehistoric predators and JFC for example) they don´t check the proportions and in the end they show a bunch of contradictory information |
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| Fist of the North Shrimp | Sep 26 2012, 03:10 AM Post #609 |
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vá á orminum
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Seriously, I like you very much *Cough Cough* |
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| Temnospondyl | Sep 26 2012, 03:29 AM Post #610 |
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Stegocephalia specialist.
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This topic is a fanboy war |
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| Jinfengopteryx | Sep 26 2012, 03:44 AM Post #611 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Here I post it for everyone: ![]()
How's that? Here some quite intelligent posts are made. |
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| theropod | Sep 26 2012, 04:04 AM Post #612 |
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palaeontology, open source and survival enthusiast
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some... jinfeng, unfortunately I can´t see the image |
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| Jinfengopteryx | Sep 26 2012, 04:07 AM Post #613 |
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Aspiring paleontologist, science enthusiast and armchair speculative fiction/evolution writer
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Than, klick on this. |
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| theropod | Sep 26 2012, 04:11 AM Post #614 |
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palaeontology, open source and survival enthusiast
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| Fragillimus335 | Sep 26 2012, 04:43 AM Post #615 |
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Omnivore
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Hmm.. we really need to get a new pic for Spinosaurus in the op, maybe this?![]() The one that's there now looks pretty pathetic. |
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