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Tyrannosaurus Snouts In Section by Qilong Tyrannosaurus Snouts In Section by Qilong
Tyrannosaurus Snouts In Section by Qilong (print image)

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Not all Tyrannosaurus rex skulls are equal. Some get pretty banged up in the process of arriving from birth to death, and from death through burial to a fossil, and then even then can get damaged when uncovered and prepared. So its no surprise that when some bones are found, they're not in the best of conditions. This entire process is called Taphonomy, and is a critical science to learning how to interpret fossils. The problem comes from assuming the "found" condition of the bones was the "live" condition. So here is a comparison of three T. rex snouts, cut through the middle of the snout. Black represents bone and grey represents nonbone. Bones are labeled with three letter designations: NAS = nasal, MAX = maxilla, VOM = vomer, DEN = dentary. Tyrannosaur roots run deep, so they are shown in found positions and the sockets are preserved. There's some black on the teeth themselves that represent how much of the tooth shown is enamel.

As I discuss on my blog, qilong.wordpress.com/2014/03/1… , there are many things going on in this image.

On the far left is a typical snout, representing the "classic" mount found at the American Museum of Natural History, known generally as 5027. The infamous Sue is in the middle, but the skull was strongly bent, crushed downward and skewed to the side, so what I'm shoing is only partially what was found, and you can see not just a mandible pushed up into the upper jaw, but also the other side of it skewed to the side. Sue's head was found lying on top of one of her mandibles. Finally, we have "Stan," who was a relatively smaller tyrant than Sue, but had a head about the same size. When it was found, Stan's head was very loosely attached, and the parts could be disassembled easily. What was found with this skull, though, were many defects of the internal regions of the snout, but there are also holes in the mandibles where there aren't normally. Stan also has abnormally short jaws, where 5027 and Sue have "normal" length jaws; but more than that, Stan's right jaw was shorter than the left! which certain makes for awkward eating.

Taken together, it is hard to herald the second or third as perfect, but the first shows fewer defects and we can place it as a "icon" of the species. These are only some of the reasons why using just one or two particulars of a broad collection of particulars is problematic, an informal fallacy known as generalizing the specific. Taken in full, tyran skulls are fairly complex, but ultimately prone to deformation that means we have to look at more than one thing.
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:iconagv120395:
AGV120395 Featured By Owner May 5, 2015
some of Sues' deformities are perimortem, right?
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:iconqilong:
Qilong Featured By Owner May 5, 2015
Unclear. It's likely most of the cranial and postcranial deformities are postmortem, with twisting certainly being postmortem sedimentary-based.
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:iconpr0teusunbound:
Pr0teusUnbound Featured By Owner Mar 21, 2014  Hobbyist General Artist
i always wondered what was going on inside the snouts of therapods. there are so many fenestra sinus and open spaces i cand barely guess at what was actually in there. 
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:iconqilong:
Qilong Featured By Owner Mar 21, 2014
This suggests I can help clear the issue up, but I think Thomas Carr's website on tyrannosaur skull anatomy does a pretty good job: tyrannosauroideacentral.blogsp… as does the website and papers at the WitmerLab: www.oucom.ohiou.edu/dbms-witme… I highly recommend these resources.
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:iconolofmoleman:
olofmoleman Featured By Owner Mar 18, 2014   Digital Artist
Isn't Stan often used as the archetypical Theropod template though? Since the preservation was so good on that fossil, even with the abnormalities.
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:iconqilong:
Qilong Featured By Owner Mar 18, 2014
There's a lot about Stan that is awesome, in the detailed separation and thus accessibility of the parts. But the deformities aren't to be overlooked. Tracy Ford is commenting on the potential of the problems of the mismatch jaws and overbite being potentially more present than we give it credit for, which bears some investigation; but if it were, in specimens studied, it's hardly been remarked upon.
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:iconolofmoleman:
olofmoleman Featured By Owner Mar 23, 2014   Digital Artist
I suppose every specimen has it's faults. Nice cutaway though btw.
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:iconqilong:
Qilong Featured By Owner Mar 23, 2014
I try. Not perfect, and not exact, but effective.
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