RE: Ornithischia/Saurischia Ilium Mass Distribution Hypothesis

["Mike Milbocker" <mmilbocker@psdllc.com>]

Jaime A. Headden wrote:

>Perhaps tring *Euoplocephalus* or any ankylosaur, which are decidedly
>front heavy at the acetabulum

The challenge of the ankylosaurids is that their ilia extend laterally (3D,
not planar). To settle this question, a cast is needed and one must follow
the hypothesis by weighing the two parts. However, I feel a good set of
lateral and ventral photos would settle the question. I refer you to the
photo contained at the below site for a good shot of a Talarurus, which
shows the posterio-lateral shelf larger than the anterior.

http://images.google.com/imgres?imgurl=tolweb.org/tree/eukaryotes/animals/ch
ordata/dinosauria/ankylosauromorpha/ankylosauridae/ankylo3.jpg&imgrefurl=htt
p://tolweb.org/tree%3Fgroup%3DAnkylosauridae%26contgroup%3DAnkylosauria&h=22
9&w=500&sz=28&tbnid=BOSOX7VCquUJ:&tbnh=57&tbnw=126&prev=/images%3Fq%3Deuoplo
cephalus%26start%3D140%26hl%3Den%26lr%3D%26ie%3DUTF-8%26oe%3DUTF-8%26sa%3DN

Looking from above the ilium looks triangular, with the vertex pointing
anteriorly.

I will continue to research this subject. However, I trust you are not using
the acetabulum as your point of dissection, because it is clearly posterior
from the point of dissection instructed by the hypothesis.

Regards, Mike Milbocker