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Huayangosaurus - a primitive little stegosaur by ScottHartman Huayangosaurus - a primitive little stegosaur by ScottHartman
Huayangosaurus is an odd little fellow - it's clearly a stegosaur (or almost) but it also has a really wide head (not obvious here in side view) and limbs that were not nearly as straight as in later stegosaurs. They also may have had more armor - here I've placed some osteoderms like the ones found as if in a continuing row with the shoulder spike, but the number and position of them isn't certain (they could have gone on down the tail or their could have been multiple rows like in Scelidosaurus, etc.).
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:iconmegalotitan:
Megalotitan Featured By Owner Jan 31, 2016  Hobbyist Traditional Artist
Did stegosaur shoulder spikes, plates, and thagmozizers "evolve" from early thyreophoran ostoderms?
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:iconscotthartman:
ScottHartman Featured By Owner Feb 3, 2016  Professional Digital Artist
Yes, that's pretty much it. And of course even in stegosaurs we see quite a bit of diversity in plate and spike shape.
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:icondracorexius:
Dracorexius Featured By Owner Edited Jan 18, 2016
Could you possibly do Skeletals for Gigantspinosaurus and Dicraeosaurus?
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:iconscotthartman:
ScottHartman Featured By Owner Jan 19, 2016  Professional Digital Artist
Dicraeosaurus is a long shot for this summer. Gigantspinosaurus is not on any of my lists right now, so probably has to wait until some commissions it.
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:iconzegh8578:
ZEGH8578 Featured By Owner Jan 12, 2016
Yeah, Stegosaurid armor needs to do a better job at staying articulated with the skeleton. Last time I was going to give Dacentrurus a go, I found myself just going in circles, as in, arrangement suggestions were based on arrangement suggestions based on arrangement suggestions. In the end, it seemed like that was all it was, a bunch of suggestions, and the spikes or plates could have had any arrangement at all. This really prodded at my OCD, and still does.
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:iconscotthartman:
ScottHartman Featured By Owner Jan 12, 2016  Professional Digital Artist
Yeah, that's the problem with stegosaurs these days, no respect at all for the paleontographer. ;)
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:iconeclecticmanta:
EclecticManta Featured By Owner Jan 9, 2016  Student Digital Artist
A very odd but interesting fellow!! I hope we find more fossils of him to figure out the exact placement of the armor :)
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:iconscotthartman:
ScottHartman Featured By Owner Jan 10, 2016  Professional Digital Artist
You and me both!
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:iconhotshotraptor:
Hotshotraptor Featured By Owner Jan 9, 2016  Hobbyist
hmmm very interesting dinosaur, it sure is a odd stegosaur i might draw this at some point
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:iconarchanubis:
Archanubis Featured By Owner Jan 9, 2016
Got a pretty deep head compared to other stegosaurs, too.  And is that a small club at the end of its tail?
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:iconscotthartman:
ScottHartman Featured By Owner Jan 9, 2016  Professional Digital Artist
Yes to both, although there is some question as to whether the tail club is a real thing or is pathological. To be consistent here I also showed the fused caudal vertebrae, so if it is a pathology I showed all of them.
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:icondontknowwhattodraw94:
Dontknowwhattodraw94 Featured By Owner Jan 9, 2016  Hobbyist Traditional Artist
Interesting features on this one. I'm not so familiar with Thyreophora, but looking at how in this early Stegosaurid osteoderms are present, could it be that those evolved before the typical plates and spikes in Stegosaurids? Would the early members of Thyreophora then look more like something among the lines of Scutellosaurus with less or smaller osteoderms? Just a thought of course.
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:iconscotthartman:
ScottHartman Featured By Owner Jan 9, 2016  Professional Digital Artist
I think the consensus is that the osteoderms came first, and in stegosaurs they specialized some at the expense of others and eventually arrived at the plates and spikes configuration of derived forms. It's worth noting that other taxa, even Stegosaurus have smaller osteoderms associated with them besides the plates and spikes. The "road kill" specimen shows a concentration of them around the neck and throat, while as far back Marsh they were described as being scattered in the quarry and probably covering various parts of the body (we're talking about thumbnail-sized osteoderms here, so more like chainmail). 
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:iconpappasaurus:
Pappasaurus Featured By Owner Jan 8, 2016  Hobbyist Artist
Wow, your skeletal drawing looks awesome!
:) (Smile) 
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:iconscotthartman:
ScottHartman Featured By Owner Jan 8, 2016  Professional Digital Artist
Thanks :)
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:iconpappasaurus:
Pappasaurus Featured By Owner Jan 8, 2016  Hobbyist Artist
You're welcome.
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:iconxstreamchaosofficial:
XStreamChaosOfficial Featured By Owner Jan 8, 2016  Hobbyist Traditional Artist
Wow! I can see the ankylosaur in it XD
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:iconcjcroen:
CJCroen Featured By Owner Jan 8, 2016  Hobbyist Traditional Artist
Neat!
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:iconjeda45:
Jeda45 Featured By Owner Jan 8, 2016
Oooh! I've always really liked stegosaurs. I'm struck by how bent its hind limbs are compared to more derived stegosaurs and the Greg Paul version.

Given the preservation of the material, what are the odds that there would have been more osteoderms than shown here? 

...wait, is that a tiny tail club? I hadn't noticed that before. Huh.
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:iconscotthartman:
ScottHartman Featured By Owner Jan 8, 2016  Professional Digital Artist
I think the odds are quite good that there could be more osteoderms - I debated whether to just leave them off, or go with this version, because it's sort of misleading no matter what I do with them :(
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:iconjeda45:
Jeda45 Featured By Owner Jan 8, 2016
That's good to know. I guess I should be keeping an eye out for reconstructions that show six of the small osteoderms to a side, then, and do my part to shake up those osteoderm counts.
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January 8, 2016
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