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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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~Yapok96 Jul 2, 2010

Hey, would you mind if I use this as a reference for a 3D model? I don't like the pose of the Achillobator skeletal, this kust seems more neutral.

~Steveoc86 Jul 2, 2010

You may, but use other skeletal reference as well.

Don't just trust the drawing. Utahraptor is so incomplete that it's probably wrong in places. Also if I were to redo this I would do the feathering differently. More like this guys [link] .

Also the arms are probably posed too far forward, I'd rotate them back a bit, more like the angle they are seen in Jamie's skeletal. [link]

You could print out the skeletal, cut it up and repose it?

~Dilong-paradoxus Jul 28, 2008 Hobbyist Photographer

It looks awesome! However, I would put less feathers on it because it was such a large animal.

10m? That's just scary. Even 5m is just...wow.

Anyway, It looks great!

~Steveoc86 Jul 28, 2008

Thanks for the fav!!

I wouldn't take the 10m estimate too seriously. The estimate may be over simplifed.
Nearly all maniraptorans are feathered this way (or somthing similar) and it wouldn't make sence to reduce them too much. Anyway, thanks for commenting!!

~Dilong-paradoxus Jul 28, 2008 Hobbyist Photographer

Yeah, I was wondering about the 10m...

About the feathers, you might be right! I was thinking about it, and I remembered that some similar sized animals today have a full bodily covering (Horses, large bears, etc.)...

You're welcome!

!JohnFaa Aug 26, 2011 Student Writer

Even then, unlike mammals, large maniraptors can afford feathers thanks to a more sophisticated "cooling system". Modern tropical ratites have a more extensive feather coat than similar sized mammals, after all.

~bsu Jan 26, 2008

oh man this is realy beautiful work

~Steveoc86 Jan 26, 2008

Thanks

and thanks for the fav!

~darkbinder Jan 25, 2008 Student

Some says that it could reach 10m in length

¡¡¡ Good job

~Steveoc86 Jan 25, 2008

Thank you! and thanks for the favs!.

Please don't take the reconstruction too seriously...it’s mainly based on a close relative. The 10m estimates contain a lot of assumptions, so again, don’t take them too seriously. Also I’ve read that based on a more recent abstract a length of only 4m...... the above image assumes that Utahraptor has very similar anatomy to Achillobator. Cheers!

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