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#Deinonychosauria
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Submitted: May 22, 2007
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Utahraptor ... well sort of...by ~Steveoc86

Traditional Art / Drawings / Animals

This image is more to give an idea of its size because it’s not really based on any remains (There’s hardly any described) The dino in the image is based on general dromaeosaur proportions scaled to match a tibia measurement 505mm. The skull is based mostly on Dromaeosaurus. The Premaxilla was decribed and this image takes that into account. It seems blunter than some other dromaeosaurs.

Note: This image has changed from its original version due to comments below.

Update: This has changed a fair bit. It's now based on Achillobator, (because it is one of its closest known relatives and there is a skeletal reconstruction available) scaled to have a tibia the length of the holotypes (which measures 505mm). I have recently gained accessed to the paper describing the animal. Sadly there’s not much described. The authors compare it to a particular specimen of Deinonychus. What they say is that a lot of the bones are about twice the size of the equivalent bones in Deinonychus, except the tibia which is shorter than would be espected. According to a DML post there is another specimen that apparently has a femur measuring 565mm. If Achillobator proportions apply that specimen would be a little larger than the one shown here.

The Holotype has a tibia of 505mm, scaling Jaime Headden’s Achillobator reconstruction to have a tibia of this size gives an animal approximately 5.5m long. The other specimen with the 565mm femur, I get an animal approaching 6m long.

However it should be noted that an abstract from a SVP meeting (2007) claims that ‘’vertebrae suggest a maximum skeletal length of ~4m’’. To me this seems too short for what the limb bones suggest.....unless the animal has extra long legs.....or something. Or maybe the estimate is based the more complete specimens and they have ignored the holotype in this statement due to its incompleteness? (Which only has a few vertebra described which are all caudals).

There have been rumours online of 10m specimens. [link]

Update: 17/9/10 So.......Scott Hartman has just released a skeletal of Utahraptor!! Err.....well.....This is all wrong. Oh Well. I tried. I'll have to update this now.

[link]

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~darkbinder Jan 25, 2008 Student

,i just was saying something that i read.

~JD-man Nov 7, 2007

Of all the life restorations of achillobator I've been able to find online (all 4 of them), yours is the best IMHO. I think it's your drawing style that sets it a apart from the rest. I particularly like achillobator's facial expression in your drawing.

~Steveoc86 Nov 7, 2007

Thanks

, the head isn't really achillobator (which is only known from a maxilla) the rest is based on it though.

~Kawekaweau Oct 4, 2007

Oh, me encantan las escalas.

Directo a mis favoritos.

~Steveoc86 Oct 4, 2007

Thank you, and thanks for the favs
Gracias, y Gracias para el favs

*EWilloughby Aug 27, 2007

I like the shading and texturing you've done here, and the anatomy is pretty good too, especially now that you've taken some other people's advice on feathering and stuff. I especially like the head and the eye.

~Steveoc86 Aug 27, 2007

Thanks

, I wish there were utahraptor skeletal reconscructions avalible, it would really help with the anatomy. Im not shure how much is known of utahraptors' skull now?

~WaylonRowley Aug 12, 2007

Although I would generally agree with Mr. Hartman, I think (and this is purely my opinion, mind you) that function should trump ancestry. Being a large predator that probably got its head and neck covered in blood and other delicious fluids from kills, it seems reasonable to restore it without feathers in these areas. I probably wouldn't put many scales on it, though....I would just give it wrinkled, naked, vulture-ish skin. I also see no need for this animal to have an extensive array going down II, which also probably got its share of abuse and juice-slathering when attacking prey. I suppose that I would leave the feathers off the arm entirely, but I admit to being biased. I'm not a huge fan of feathers in general. Unless they have a sexual-display/territorial-signaling/maneuvering-aerofoil/camoflage purpose, they're just energetically-expensive structures to retain and maintain (if preening was necessary). Again....just my opinion. I think you've got a great pic here.

!JohnFaa Aug 26, 2011 Student Writer

Maniraptors avoid the "too big for integrument" argument because of their air sac pulmonary system, which makes control of body heat more more efficient. In addition, not only do most modern "raptors" (eagles and stuff) have feathered heads, the surface area of most theropods means they would loose much more body heat than modern mammals and birds.

~indigomagpie Sep 14, 2011

But don't all saurischians have an air sac system?

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