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Spinosaurus aegyptiacus v Tyrannosaurus rex
Topic Started: Jan 7 2012, 02:16 AM (459,286 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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Replies:
Kurtz
Kleptoparasite
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theropod
Jan 14 2013, 05:04 AM
You mean the rostrum/snout, not the nose. Spinosaurus didn have a "nose", it had nasals, it certainly had an olfactory area and it had nares, but it didn have a "nose", which is the external protrusion of cartilage and the nasals.
in short words a king-size nose
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Godzillasaurus
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Kurtz
Jan 14 2013, 06:18 AM
theropod
Jan 14 2013, 05:04 AM
You mean the rostrum/snout, not the nose. Spinosaurus didn have a "nose", it had nasals, it certainly had an olfactory area and it had nares, but it didn have a "nose", which is the external protrusion of cartilage and the nasals.
in short words a king-size nose
What? Spinosaurus had a snout. Not a nose.
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dinosaur
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T.Rex nearly broke spinos neck.
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Ausar
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I think a long rostrum might actually help cause if the T.rex is somewhat farther away, Spino can probably still grab onto him with his jaws.
Edited by Ausar, Jan 14 2013, 06:57 AM.
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theropod
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palaeontology, open source and survival enthusiast
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the long slender shape mainly makes it more exposed to stress due to the long moment arm, however keeping in mind the rostrum is basically a solid piece of bone, characterising it as weak would be premature. Of course a longer snout means a longer reach, but it has far longer reach tghan rexy anyway, due to sheer size and height. The main reason for the elonngated snout is the reduced survace area allowing swift movements in water.
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Kurtz
Kleptoparasite
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theropod
Jan 14 2013, 07:08 AM
the long slender shape mainly makes it more exposed to stress due to the long moment arm, however keeping in mind the rostrum is basically a solid piece of bone, characterising it as weak would be premature. Of course a longer snout means a longer reach, but it has far longer reach tghan rexy anyway, due to sheer size and height. The main reason for the elonngated snout is the reduced survace area allowing swift movements in water.
agree
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Fragillimus335
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My newest Spinosaurus skull reconstruction. Based partially on Theropods recon, Suchomimus, and juvenile Spinosaurus skulls.
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Total length is ~195 cm.
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theropod
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looks great!
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DinosaurMichael
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God will this debate ever end. It's 50/50 everyone. CASE CLOSED!
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Kurtz
Kleptoparasite
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DinosaurMichael
Jan 14 2013, 07:36 AM
God will this debate ever end. It's 50/50 everyone. CASE CLOSED!
T Rex should make a short job of spino
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Fragillimus335
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theropod
Jan 14 2013, 07:35 AM
looks great!
Thanks, Yours inspired me!
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Carcharadon
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dinosaur
Jan 14 2013, 06:55 AM
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T.Rex nearly broke spinos neck.
lol using dinosaur king as your source?
Edited by Carcharadon, Jan 14 2013, 11:16 AM.
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dinosaur
Heterotrophic Organism
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Dark allosaurus
Jan 14 2013, 11:15 AM
dinosaur
Jan 14 2013, 06:55 AM
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T.Rex nearly broke spinos neck.
lol using dinosaur king as your source?
This is what will happen to spino, if tyrannosaurus uses its head.
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Black Ice
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Drom King
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dinosaur
Jan 14 2013, 12:32 PM
Dark allosaurus
Jan 14 2013, 11:15 AM
dinosaur
Jan 14 2013, 06:55 AM
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T.Rex nearly broke spinos neck.
lol using dinosaur king as your source?
This is what will happen to spino, if tyrannosaurus uses its head.
 :-/ ........................
Posted Image
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dinosaur
Heterotrophic Organism
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Black Ice
Jan 14 2013, 12:56 PM
dinosaur
Jan 14 2013, 12:32 PM
Dark allosaurus
Jan 14 2013, 11:15 AM
dinosaur
Jan 14 2013, 06:55 AM
Posted Image


T.Rex nearly broke spinos neck.
lol using dinosaur king as your source?
This is what will happen to spino, if tyrannosaurus uses its head.
 :-/ ........................
Posted Image
What's that saying?
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