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About Digital Art / Professional Core Member Scott HartmanMale/United States Recent Activity
Deviant for 11 Years
1 Month Core Membership
Statistics 231 Deviations 4,618 Comments 396,999 Pageviews

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Batrachotomus - the 'typical' Triassic loricatan by ScottHartman Batrachotomus - the 'typical' Triassic loricatan :iconscotthartman:ScottHartman 225 16 Opisthocoelicaudia by ScottHartman Opisthocoelicaudia :iconscotthartman:ScottHartman 167 60 Postosuchus big and small by ScottHartman Postosuchus big and small :iconscotthartman:ScottHartman 374 55 Dreadnoughtus - huge, but not the 'hugest' by ScottHartman Dreadnoughtus - huge, but not the 'hugest' :iconscotthartman:ScottHartman 268 62 Poposaurus gracilis sauntering along by ScottHartman Poposaurus gracilis sauntering along :iconscotthartman:ScottHartman 207 34 Teleocrater by ScottHartman Teleocrater :iconscotthartman:ScottHartman 212 46 Confuciusornis by ScottHartman Confuciusornis :iconscotthartman:ScottHartman 168 54 Ixalerpeton by ScottHartman Ixalerpeton :iconscotthartman:ScottHartman 163 27 Dawn 'bird' by ScottHartman Dawn 'bird' :iconscotthartman:ScottHartman 151 13 Jinfengopteryx elegans - the golden phoenix by ScottHartman Jinfengopteryx elegans - the golden phoenix :iconscotthartman:ScottHartman 138 22 Chinese Hunter by ScottHartman Chinese Hunter :iconscotthartman:ScottHartman 152 20 The not-so-gracile Leptoceratops by ScottHartman The not-so-gracile Leptoceratops :iconscotthartman:ScottHartman 151 39 Paleorhinus - not a croc! by ScottHartman Paleorhinus - not a croc! :iconscotthartman:ScottHartman 181 53 A big ichthyosaur by ScottHartman A big ichthyosaur :iconscotthartman:ScottHartman 170 71 Finally, an aetosaur! by ScottHartman Finally, an aetosaur! :iconscotthartman:ScottHartman 204 36 Granddaddy of the armored dinosaurs by ScottHartman Granddaddy of the armored dinosaurs :iconscotthartman:ScottHartman 184 41

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ScottHartman's Profile Picture
Scott Hartman
Artist | Professional | Digital Art
United States
Current Residence: Wisconsin
Favourite genre of music: Anything but country!
Operating System: Windows 10, OSX, & Android
MP3 player of choice: Anything that can connect to Google Music…


Batrachotomus - the 'typical' Triassic loricatan
Though Postosuchus gets more publicity, Middle Triassic Batrachotomus is a better match for the four-legged, big-headed non-sprawling predatory crurotarsan that people imagine when thinking of this time period (or watching Walking with Dinosaurs). Batrachotomus is also pleasantly complete, making restoring it a straightforward process. This skeletal was done in conjunction with the Dawn Dinos project ( ) which I recommend you check out if you haven't already!
Opisthocoelicaudia is an odd sauropod. It's usually found to be related to Alamsaurus and possibly Saltasaurus, it has very robust limbs, and surprisingly short tail, and (thanks to "Nemegtosaurus") a pleasantly complete skull. One thing it's missing are most of the cervicals - here I've started with sub-adult Alamosaurus as a scaling guide and then went just a little shorter. The back slopes up gently to the shoulders, but seems to flex up strongly in the preserve cervicodorsal juncture.
Postosuchus big and small
For such an iconic Triassic archosaur, Postosuchus has proven lots of trouble when it comes to restoring what it looked like and how it got around. Getting the proportions right isn't a trivial matter, as none of the remains are so completely preserved/prepped/described that they can stand in for an entire skeleton. Simple cross-scaling of the specimens isn't possible, as they are of different sizes and exhibit allometric scaling (more on that in a sec).

With a bit of care I've managed to pull together a reasonable composite based on (and scaled to the size of) the type specimen, TTU-P 9000. One of the larger sticking points (in part related to getting the proportions correct) has been if and to what degree Postosuchus was bipedal. While the forelimbs are robust for their size, recent work has noted that the forelimbs are substantially shorter than the hind limbs, which at least in the type specimen I heartily agree with.

One thing that is interesting, however, is that the smaller paratype specimen TTU-P 9002 has different limb proportions - the forelimbs are quite a bit longer relative to the hind legs, and in fact are nearly as long as in the substantially larger type specimen. I've scaled down the skull and axial skeleton to match the limbs of 9002 in the smaller skeletal above. It's tempting to infer that the young of Postosuchus were quadrupeds (or at least were _more_ quadrupedal), and as they grew Postosuchus spend more time on its hind legs alone.
Dreadnoughtus - huge, but not the 'hugest'
Massive props to the authors of the Dreadnoughtus papers, this has to be one of the best documented and figured sauropods of all time, and in quite a short span of time (the specimen was just named four years ago!).

Of course what everyone wants to discuss is the size of Dreadnoughtus. The mass has been downsized a few times since the initial description's claim of 59 tonnes; I don't have anything new to add other than what has been said previously (i.e. it wasn't as big as Argentinosaurus, Patagotitan, the Mexico "Alamosaurus" or Puertasaurus).

Length-wise I get 23 meters along the curve of the back, a bit shorter than the 26 meters in the original paper. Most of that is due to my interpreting a large cervical as the 10th rather than the 9th cervical. Doing so has a knock-on effect that shortens the estimate for most of the cervical vertebrae. It's still got a heck of a long neck, even for a titanosaur. I'd be remiss not to point out that there's no way to tell which position is correct at this point - we will need more Dreadnoughtus cervicals to know for certain, but in the absence of any additional data I'm going with the more conservative interpretation.
Poposaurus gracilis sauntering along
The eponymous poposaurid (a group of croc-line archosaurs), it sorta parallelled theropods in becoming bipedal, but was also quite different from theropods in other ways.
Hello DAers!

My long absence due to multiple projects (and teaching, and graduate school) is probably a month away from coming to an end. I apologies for those who sent me IMs and didn't hear back, sometimes for months. If there is a rush it's almost always better to contact me through my website contact form, as I'll see that right away.

Also, I should have lots of fun skeletals to show off in the coming months (and years) thanks in part to the work I put in over the last 9 months. I look forward to chatting with you all again in a few weeks!



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deinocheirusmaster Featured By Owner Jul 31, 2018
Can I use your Stokesosaurus skeletal as a reference. I’m in the beginning of writing a novel called Dominant and theres a Stokeosaurus who is the protagonist of the novel. I just want to make sure his final design is accurate before I post it on my gallery. Check it out thought if you'd like.
Dinopithecus Featured By Owner Jul 3, 2018
Oh my did I forget this? Was I so absorbed in other things that I forgot your birthday?? Oh well. I hope your birthday was the best it could be!

And now, I welcome you back from one of the most important days of your life with...another one of my silly inquiries.

I recently had a talk with an online friend of mine about absolute bite force figures for good ol' Tyrannosaurus rex, whose bite force figures range tremendously when you dig into the scientific literature. It seems that things such as discrepancies between in vivo vs. biomechanical model estimates, peak vs. sustained bite force, pennate or parallel muscles, jaw muscle reconstruction (an obvious one), and muscle tension need to be taken into account. In fact, while I'm 1000% sure the dinosaur could still bite with bone shattering force, the whole thing just seems to be a mess.

As much of a mess as this may be, what do you think is probably the most plausible bite force figure for a living adult Tyrannosaurus and at what body mass (and tooth position?)?
HyperSpaceThePivoter Featured By Owner Jul 3, 2018  Hobbyist Filmographer
Sorry for being late, but happy birthday Scott!
ScottHartman Featured By Owner Jul 3, 2018  Professional Digital Artist
I accept well-wishing at any time, thanks!
Smnt2000 Featured By Owner Jul 3, 2018  Hobbyist Traditional Artist
A bit late, but happy birthday Scott!
ScottHartman Featured By Owner Jul 3, 2018  Professional Digital Artist
Thank you kindly.
MREMILABLE Featured By Owner Jul 2, 2018  Hobbyist General Artist
Happy birthday
ScottHartman Featured By Owner Jul 3, 2018  Professional Digital Artist
MREMILABLE Featured By Owner Jul 3, 2018  Hobbyist General Artist
your welcome
Megalotitan Featured By Owner Jul 2, 2018  Hobbyist Traditional Artist
happy birthday!
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