RE: prearticular picture perhaps

[Jaime Headden <qi_leong@hotmail.com>]

  Tyrannosaur prearticulars are covered substantially in Carr's large papers on 
cranial ontogeny, especially the 1999 one, while Currie (1995) described the 
prearticular for *Dromaeosaurus albertensis*, and Ostrom did the same for 
*Deinonychus antirrhopus*. *Masiakasaurus knopfleri* has a prearticular 
described in all major views, from Carrano, Lowen and Sertich's 2011 
supplemental osteology. Lingual views of *Velociraptor mongoliensis* mandibles 
are few and far between due to the tendency of not preparing the material 
apart, but leaving them _in situ_ for mounts or displays (the same is also true 
of *Shuvuuia deserti*, and I am unaware of CT work presenting the hidden 
information in either). Makovicky et al. describe an angular for *Byronosaurus 
jaffei*, but CT doesn't reveal a prearticular labial to this structure; 
regardless, the structure appears partially disarticulated from the associated 
surangular and slightly underlies it, while possessing a strong upward 
curvature of the rostral half of the preserved bone, implying it may be 
"prearticular-shaped", though it also possesses a broad caudal half, which I 
think firmly ensconces it as an angular with a C-shaped lateral aspect. Brochu 
described the prearticular further for "Sue," while Barsbold (1983) assessed 
the prearticular for MPC-D 100/42 briefly, agreeing with Cracraft's (1940) 
assessment of *Caenagnathus collinsi* in that it is amazingly avian-like, 
shallow and rodlike, and extends rostrally along the dorsal margin of the 
splenial rather than ascends into a C-shaped aspect towards the coronoid 
region. Osmólska (1972) described the prearticular for *Gallimimus bullatus*, 
and Kobayashi and Barsbold (2004) describe the preserved remains of 
prearticulars in *Garudimimus brevipes*, which is rostrally incomplete but 
preserves a gentle slope dorsally as in *Gallimimus*. The prearticular region 
is unfortunately obscured for *Harpymimus okladnikovi,* but partially exposed 
in *Sinornithomimus dongi* (KObayashi & Lü, 2003) in which is preserves the 
same g!
eneral mo
hology in other ornithomimosaurs.

Hope this helps.

Cheers,

  Jaime A. Headden
  The Bite Stuff (site v2)
  http://qilong.wordpress.com/

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)


"Ever since man first left his cave and met a stranger with a
different language and a new way of looking at things, the human race
has had a dream: to kill him, so we don't have to learn his language or
his new way of looking at things." --- Zapp Brannigan (Beast With a Billion 
Backs)


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> Date: Sun, 9 Sep 2012 18:07:06 +0100
> From: df9465@yahoo.co.uk
> To: dinosaur@usc.edu
> Subject: prearticular picture perhaps
>
>
>
> Hi everyone,
>
> I'm trying to find decent images of theropod prearticulars, particularly 
> dromaeosaurids. The figure in the Deinonychus monograph (Ostrom 69) is rather 
> lacking in detail. You can see a bit of the prearticular on the holotype of 
> Velociraptor (so a nice photo of that would be good). Otherwise I'm trawling 
> various theropod literature, but I figured someone here might know off hand 
> where is a good place to look.
>
> Thanks.
>
> DF
>
>
> ----------------------------------
> Denver Fowler
> df9465@yahoo.co.uk
> http://www.denverfowler.com
> http://www.facebook.com/pages/Horner-Paleo-Lab-Museum-of-the-Rockies/230141317002543
> -----------------------------------
>
>
> ________________________________