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The Dilophosaurus Yawn by Qilong The Dilophosaurus Yawn by Qilong
Dilophosaurus wetherilli is named for the explorer John Wetherill, whose nephew informed the fellows at the University of California's Museum of Paleontology (UCMP) of the finds of several specimens near Kayenta, Arizona in the then-Triassic near-Chinle rocks as they were known. Two skulls have been recovered and noted to date, but the first was in pretty terrible condition, while the second preserved a pair of crests. This gave Samuel P. Welles, then at the UCMP, the honor of naming one of the more famous of Jurassic Park dinosaurs Megalosaurus wetherilli (John Wetherill's great lizard), and then Dilophosaurus wetherilli (John Wetherill's two-crested lizard).

Here, the skulls are shown with jaws agape (left) and closed (right).
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:icongamerey:
Gamerey Featured By Owner Apr 16, 2017
Do you think Dilophosaurus was a coelophysoid or a more derived neotheropod?
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:iconceratopsia:
Ceratopsia Featured By Owner May 7, 2016  Hobbyist General Artist
And may I use this for a drawing I'm  going to make? Again, I will give you full credit.
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:iconceratopsia:
Ceratopsia Featured By Owner May 7, 2016  Hobbyist General Artist
Would it be ok for me to use this skeletal in a clay model I'm making (I will fully credit you)
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:iconthemeekwarrior:
TheMeekWarrior Featured By Owner Aug 7, 2014  Hobbyist General Artist
Love the jaws on these guys. Those teeth look wicked!! Nice illustration! :D
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:iconfragillimus335:
Fragillimus335 Featured By Owner Oct 5, 2013  Hobbyist General Artist
This may be the coolest hunk of bone ever evolved...
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:iconqilong:
Qilong Featured By Owner Oct 6, 2013
It is pretty cool. Not as cool as oviraptorosaurs, though.
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:iconmegalosaurid:
Megalosaurid Featured By Owner Oct 5, 2013
I imagine this carnivore as a slicer, impaling the prey with the teeth and then causing a blood loss, you dont need to have a strong maxillar connection to slice through the prey without holding it, it also possesed very powerful arms and legs that made it an efficient hunter.
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:iconqilong:
Qilong Featured By Owner Oct 6, 2013
There is no evidence that Dilophosoaurus had "weak jaws." The muscle areas for jaw attachment haven't been analyzed, but side-profile leverage models done a LONG time ago suggested the bite force production was relatively low along the jaw, but efficient at the tips. A similar bite profile exists in other long-jawed animals, and isn't necessarily evidence of weak bites. That is, this model would be true of crocodilians, and they are clearly not "weak biters."

The issue of the teeth relevant to biting is mostly in their shape, in which they are efficient piercers with a slicing component, so they may be pressed into the flesh and then drawn through the flesh as the jaw pulls them out. This creates lacerating wounds with small nips, but we don't assume the nips are always small. The head is not an isolated object; it is attached to a neck and a body, and that alters how the head behaves with regards to prey. Like most theropods, Dilophosaurus probably restrained its prey using a combination of feet and hands, and used powerful neck muscles to tear and tear off chunks of food. Nipping bits, prolonged griping bites, and slicing lacerating bites are likely all employed.

It should also be noted that the teeth shown here are probably too long. They have too much of the root exposed, and the teeth are while narrow also much shorter normally. These teeth are slightly loose in the root. We assume therefore that the teeth would be closer in, and the jaw would also close a bit more, but I haven't corrected this.
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:iconorionide5:
Orionide5 Featured By Owner Dec 14, 2012
"Weak-jawed," according to Jurassic Park. I see from those teeth that that would not have mattered one bit. Can I use this reconstruction?
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:iconqilong:
Qilong Featured By Owner Dec 15, 2012
That depends; I am trying to make money off of the illustration, though no one is biting. You can, for instance, look at the print options on DA or at redbubble - [link]. Otherwise, use (personally) might have to be optioned ... or if you wish to do this commercially, with a license to me. The illustration IS covered by CC BY-NC-ND, so it really will depend on what you intend to do with it.
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:iconkazuma27:
Kazuma27 Featured By Owner Jun 17, 2012  Hobbyist General Artist
One of my favorite dinosaurs, that's for sure ;)
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:iconqilong:
Qilong Featured By Owner Jun 17, 2012
It's a fun one! It's the crests, I'm sure ;)
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:iconkazuma27:
Kazuma27 Featured By Owner Jun 17, 2012  Hobbyist General Artist
... Or that gnarly grin ;)
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:icondotb18:
DOTB18 Featured By Owner Sep 14, 2011
Didn't it have a small "spike" at the back end of the crest?
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:iconqilong:
Qilong Featured By Owner Sep 14, 2011
There's something about the preservation that appears to suggest it, but it also seems likely to be an artifact of an incomplete crest margin. In other words, the "spike" is real, but is based on an incomplete rim of the crest, so that when the crest is "complete" it may not actually exist, as I've reconstructed the skull. There is really no analogue to having such a "spike," but if I'm wrong it's not that difficult to fix this.
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:iconbensen-daniel:
bensen-daniel Featured By Owner Aug 24, 2011
Any thoughts on the uses of those long upper teeth?
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:iconqilong:
Qilong Featured By Owner Aug 24, 2011
Not exactly piercing teeth. These teeth are labiolingually compressed, and are quite thin. So while they are long, they are not exactly broad like piscivore teeth. Low aspect teeth like these should reflect penetration-focused slicing teeth, much like sabretooth canines, so imagine a row of "sabreteeth" and you might get a good idea on the jaw function involved. But that's off the top of my head.
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:iconbensen-daniel:
bensen-daniel Featured By Owner Aug 24, 2011
So like GSP described in Predatory Dinosaurs: the teeth inflict a lot of damage, so the animal can sit back and wait for the prey to bleed to death?
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:iconqilong:
Qilong Featured By Owner Aug 24, 2011
No. I am being necessarily vague here, because I will eventually disucss how the teeth work on my blog. Needless to say, the teeth are VERY effective in inflicting long gaping wounds like teeth in Allosaurus. They simply do so in a different manner. GSP argued his case because he thought the jaws were weak, somehow requiring a nip and go bite as in varanids like the Komodo, but the jaws are very, very different indeed.
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:iconbensen-daniel:
bensen-daniel Featured By Owner Aug 24, 2011
:) okay, I'll wait for the blog
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:iconeurwentala:
Eurwentala Featured By Owner Aug 21, 2011  Professional
Those are some damn scary fangs. I hadn't realized they were actually this long. Thanks for the inspiration - I think I'm drawing a Dilophosaurus next.
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:iconzegh8578:
ZEGH8578 Featured By Owner Aug 12, 2011
very nice yes
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:iconkstarrlynn:
KStarrLynn Featured By Owner Aug 12, 2011  Student Traditional Artist
What medium or program do you use for your dinosaur illustrations?
They're really good!
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:iconqilong:
Qilong Featured By Owner Aug 12, 2011
This is stippling, done by hand with a 005 Pigma Micron pen. The lines were done by a 05 Pigma Micron, as an experiment. I scanned the image into Photoshop, but an error forced the scanning resolution to 72dpi, which I can't seem to fix. I had to modify the output resolution to 300dpi, which I then digitally modified the image at, including resizing. The jaw is done separately, so I can move it around. I have to digitally remove sections of the mandible or skull to make the gape or shut images correctly fit together as a real skull would.
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:iconkoeskull:
Koeskull Featured By Owner Aug 12, 2011  Hobbyist Traditional Artist
I never knew it's upper jaw looked like that. Interesting
.
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:iconevil-do:
evil-do Featured By Owner Aug 12, 2011  Hobbyist Traditional Artist
Beautiful. Simply gorgeous.
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:iconnemo-ramjet:
nemo-ramjet Featured By Owner Aug 12, 2011
Were the teeth really that long? I always thought that part of the tooth was embedded inside the jaw.
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:iconqilong:
Qilong Featured By Owner Aug 12, 2011
The holotype skull doesn't preserve all of the teeth, but preserves some of them, and yes, they are this long. It's been argued that the teeth slipped slightly out of their sockets, or were being pushed out by underlying replacement teeth, and thus cannot be taken as the "correct" length. I think this particular argument is problematic, however. Nonetheless, you can check my extended comments here: [link]
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:iconemperordinobot:
EmperorDinobot Featured By Owner Aug 12, 2011
This has always been my favorite dinosaur and will always be my favorite dinosaur. Look at those damn teeth! I remember how back then Dilophosaurus was theorized to go mostly after carrion... Nah these things went after especially slippery prey. Maybe not so much sauropodomorphs, but ornithopods, fish, and other such fauna. It's such a fucking delicious dinosaur.
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:iconqilong:
Qilong Featured By Owner Aug 12, 2011
They MIGHT before slippery prey.... Dilophosaurus has an especially strong posterior jaw bite. It is not marginalized towards the tip or even along the jaws, which we might expect in croc-like jaws suited for rostral precision biting.
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:iconemperordinobot:
EmperorDinobot Featured By Owner Aug 13, 2011
It had very strong jaw muscles.
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:iconqilong:
Qilong Featured By Owner Aug 19, 2011
That ... depends. They don't always have strong jaw muscles. It has somewhat to do with position of the jaw muscles to the posterior margin of the dental row, which increases leverage and strength at the bite point without increasing size or ability of the muscle itself. In this way, the mechanic of the jaw is stronger, rather than just the muscle.
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:iconemperordinobot:
EmperorDinobot Featured By Owner Sep 7, 2011
Still doesn't have the bonebreaking power later...animals had.
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:iconqilong:
Qilong Featured By Owner Sep 8, 2011
Shouldn't need it. Hypercarnivores typically don't mess with bone. They receive their nutrients by metabolizing more meat, or selecting species as food that tend to consume the necessary nutrients. Diloph was certainly a hypercarnivore.
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:iconmorganobrienart:
morganobrienart Featured By Owner Aug 12, 2011
Great work!
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:iconolofmoleman:
olofmoleman Featured By Owner Aug 12, 2011   Digital Artist
Awesome.
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