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High Spined Reptile by ScottHartman High Spined Reptile by ScottHartman
Acrocanthosaurus atokensis, updated again as part of my ongoing overhaul project.

Edit: Another overhaul; redrew the skull based on the data published this week ([link]) Also made some other minor changes to the postcrania that I'd been meaning to get around to.
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:iconjonagold2000:
JonaGold2000 Featured By Owner Jan 20, 2015  Hobbyist Traditional Artist
Is it accurate if i use this or is it outdated??
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:iconscotthartman:
ScottHartman Featured By Owner Jan 20, 2015  Professional Digital Artist
The pectoral girdle should probably be a half vertebrae more forward, but otherwise it still holds up as far as I know.
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:iconjonagold2000:
JonaGold2000 Featured By Owner Jan 21, 2015  Hobbyist Traditional Artist
OK thanks
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:iconblazze92:
bLAZZE92 Featured By Owner Oct 12, 2014
Is it possible that the legs were shorter? I just noticed that the often mentioned femur lengths of both Fran and the holotype are estimates, with the later being criticized as too long by Harris (1998), that the femora are incomplete, I also just noticed in photos of the mount and the digital scans presented in several of Karl Bates publications that the femur is reconstructed there at ~120cm long, which is roughly what you'll get from isometric scaling comparing the circumference of Fran's femur with that of the only complete Acrocanthosaurus femur (SMU 74646).
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:iconpedrosalas:
PedroSalas Featured By Owner Apr 30, 2014  Hobbyist Traditional Artist
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:iconamadeus450:
amadeus450 Featured By Owner May 11, 2013  Student Traditional Artist
nice cool too
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:iconthediremoose:
thediremoose Featured By Owner Mar 6, 2013
Interesting. The skeleton on exhibit at the NCSM seemed to have unusually short legs in comparison to this. I know the spines were restored too long on the mount, but was that the only mistake?
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:iconscotthartman:
ScottHartman Featured By Owner Mar 6, 2013  Professional Digital Artist
The ribs are also too vertical, which makes the body ridiculously deep and thus makes the legs look shorter. This is a problem with like 95% of all dinosaur mounts.
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:iconlordkaizen:
LordKaizen Featured By Owner Jan 4, 2013
Very lovely. I am curios why there appear to be holes, or notches in the first few caudal neural spines. Did they serve as a way to lighten them?
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:iconscotthartman:
ScottHartman Featured By Owner Mar 6, 2013  Professional Digital Artist
Actually I suspect they are related to the large elastic nuchal ligament that runs between neural spines on the presacrals (and I'm guessing for the first dozen or so caudals, with those gaps showing where the topmost limit is).
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:iconalbertonykus:
Albertonykus Featured By Owner Sep 3, 2012
Saw this recently on a plaque at the Smithsonian NHM.
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:icondinosauru:
dinosauru Featured By Owner May 30, 2012  Student Traditional Artist
was cool
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:iconamadeus450:
amadeus450 Featured By Owner May 22, 2012  Student Traditional Artist
my fav dino
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:iconamadeus450:
amadeus450 Featured By Owner May 22, 2012  Student Traditional Artist
acrocanthosaurus
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:icontrodonto:
Trodonto Featured By Owner Mar 25, 2011
omg! sorry for the mistakes ... :x :rage:
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:icontrodonto:
Trodonto Featured By Owner Mar 25, 2011
Beautiful recontsruction "revisitation" i love it !

Is interesting thet recently the skulls of this and other three theropods was redescribed

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:iconemperordinobot:
EmperorDinobot Featured By Owner Mar 25, 2011
Gd Luis have you nothing smarter to say?
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:iconemperordinobot:
EmperorDinobot Featured By Owner Mar 25, 2011
No. Not really. Ffft. Besides I've already read papers and drawn one, but I had to comment.
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:iconscotthartman:
ScottHartman Featured By Owner Mar 25, 2011  Professional Digital Artist
Lol, could the two of you take this outside and deal with it yourself?

;)
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:iconemperordinobot:
EmperorDinobot Featured By Owner Mar 25, 2011
I'd say it looks better. This is a heavy animal. Apex predator of its time on this side of the world.
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:iconthediremoose:
thediremoose Featured By Owner Sep 23, 2011
Yes. There's so much focus on Deinonychus as being awesome, but an encounter between a group of Deininychus and an Acrocanthosaurus would probably play out just like the end of Jurassic Park.
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:iconemperordinobot:
EmperorDinobot Featured By Owner Sep 24, 2011
I honestly don't care about the following dinosaurs:
Acrocanthosaurus
Allosaurus
Deinonychus
Microraptor
Apatosaurus


They're too mainstream.
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:iconolorotitan:
Olorotitan Featured By Owner Mar 24, 2011
I am very glad that you make new skeletals regularly! The usefulness of these skeletons are not in doubt. Ever since I saw your skeletons and so far I think they are the most accurate. Keep doing the excellent work!

P.S. "Also, who is this Paul you speak of?" ))) *THUMBS UP*
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:icondinohunter000:
DinoHunter000 Featured By Owner Mar 24, 2011  Hobbyist Traditional Artist
The word of your work shall spread all across the land, and soon everyone will know of the name....Shartman! Haha great work man, I'm loving the new blog too!!
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:iconscotthartman:
ScottHartman Featured By Owner Mar 24, 2011  Professional Digital Artist
Lol. Thanks, I'm working on part 3 right now.
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:icondinohunter000:
DinoHunter000 Featured By Owner Mar 25, 2011  Hobbyist Traditional Artist
Awesome! :)
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:iconweatherfac:
Weatherfac Featured By Owner Mar 24, 2011  Hobbyist General Artist
Love the new head!
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:iconqilong:
Qilong Featured By Owner Mar 24, 2011
I like that the lachrymal finally resembles that of the holotype, which was far more arched than the lachrymal of "Fran" when it was originally discussed and restored (don't worry, Paul didn't arch the lachrymal either).
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:iconscotthartman:
ScottHartman Featured By Owner Mar 24, 2011  Professional Digital Artist
Also, who is this Paul you speak of?
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:iconqilong:
Qilong Featured By Owner Mar 31, 2011
I'm weighing you being sarcastic, or my lack of clarity: G. S. Paul's own Acro lacks the arched lachrymal.
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:iconscotthartman:
ScottHartman Featured By Owner Mar 31, 2011  Professional Digital Artist
Lol, you should have bet on sarcasm. Thanks though, I appreciate the effort :)
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:iconqilong:
Qilong Featured By Owner Mar 24, 2011
Sent too soon: I would like to note, though, that several posterior cervicals, especially from the type and paratype, have anteriorly-oriented neural spines.

There's something funky going on with those caudals (we may have discussed this before).
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:iconscotthartman:
ScottHartman Featured By Owner Mar 24, 2011  Professional Digital Artist
Yeah, I'm still at times splitting the difference between Fran and the type. Some day when I have more time I'll do a rigorous version of both (which is clearly called for) but alas that time is not yet available to me.
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:icontiffanyturrill:
tiffanyturrill Featured By Owner Mar 24, 2011  Professional General Artist
I just want to say, your work is fantastic. Personally, I really appreciate you publishing your work so regularly; you're not only a wonderful draughtsman, you're a great resource for other artists with a scientific bent! Cheers.
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:iconscotthartman:
ScottHartman Featured By Owner Mar 24, 2011  Professional Digital Artist
Thanks, that's one of the nicer compliments I've received. :D
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:iconfatcaiman:
FatCaiman Featured By Owner Feb 5, 2010  Hobbyist Traditional Artist
This looks fantastic. I always find your skeletal drawings to be very helpful. I'm not an expert by any means, but I try to be as accurate as I can. (Even though it's been years since I drew an Acrocanthosaurus.)

What was changed about the arm? I have your old skeletal drawing as well, and it seems like the main difference is in the arm position and the shape and size of the humerus. The spines look a lot more even and natural in this one.

Do you know if any other significant Acrocanthosaurus fossils were found besides Fran? That's the only one I've ever found when looking it up. I hope they find even more complete fossils of this dinosaur one day. :D
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:iconscotthartman:
ScottHartman Featured By Owner Feb 6, 2010  Professional Digital Artist
Thanks, I'm glad you find them useful. No one starts out as an expert, so just keep working on accuracy and learning more and you'll get there (or else get bored and do something else ;) ).

You are right that outside of changing the shape of the humerus the main changes to the forearm were in the position. That's actually not a trivial change though, as it turns out that Acrocanthosaurus had a fairly restricted range of movement at its shoulder joint, and the position I had originally drawn it in was too protracted (it was more forward than it could actually reach without dislocating its arms). Also, a lot more information was available on the wrist, and while it doesn't really show at this resolution, the hand (and the angle it sits at) is now more accurate.

There actually are several specimens of Acrocanthosaurus, although Fran is still the most complete.
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:iconfatcaiman:
FatCaiman Featured By Owner Sep 14, 2011  Hobbyist Traditional Artist
(Extremely late reply is extremely late.)

Do you have the titles of the papers in which the other specimens are described, and would they be available online and/or at a University library, perhaps? =)

I would also certainly be interested in seeing that comparison of Fran versus the other fossils (the holotype?) if you ever get around to it. :D

Again, I can't thank you enough for posting these skeletals since it gives us non-paleontologists a chance to draw our dinosaurs correctly. (Even though it can still be really difficult to get the 3-d shape right, at times...)
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:iconthearchosaurqueen:
TheArchosaurQueen Featured By Owner Jul 9, 2009  Hobbyist Digital Artist
Very nice work :). Although, I rather like the idea of Acrocanthosaurus Atokensis being a member of the Carcharodontosaurida. What about you?
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:iconscotthartman:
ScottHartman Featured By Owner Jul 9, 2009  Professional Digital Artist
I think the idea is interesting (I first heard Phil Currie float it over a decade ago) but functionally Acrocanthosaurus is a lot more like Allosaurus and Sinraptor than like Carcharodontosaurus and Giganotosaurus. Of course function notoriously doesn't always match phylogeny, and it could simply represent different hunt specializations for different environments.

I'm looking forward to future papers to see if the clade holds up.
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:iconthearchosaurqueen:
TheArchosaurQueen Featured By Owner Jul 9, 2009  Hobbyist Digital Artist
Hmm, well that makes sense. I do see more of Sinraptor in your skeletal of Acrocanthosaurus.

But, I‘ll use Saurophaganax as an example. But Saurophaganax has been kicked out of the Allosauridea and reclassified as a Sinraptorid. And its now believed that Carcharodontosaurids arose from the Sinraptorids. So, maybe Acrocanthosaurus along with Saurophaganax, are transitional between the Sinraptorids and Carcharodontosaurids.
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:iconcoolislandsong:
CoolislandSong Featured By Owner Jun 29, 2009
such an awesome animal, you certainly do it justice.
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:iconweatherfac:
Weatherfac Featured By Owner Jun 29, 2009  Hobbyist General Artist
Yay better arm! I'm glad to see this guy redrawn, he's one of my favorite skeletals.
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