Perforate acetabulum

Hello, I am back with another question: while I wait for my copy of 'The Complete Dinosaur' to ship, could you point me to a site with a clear picture illustrating the perforate acetabulum?

Andrea wrote-

Gee...it's been so long since we've talked of dinos. I almost forget.

A quick skim seems to indicate that there is none. Sorry. :'<

Andrea - here's one: <http://www.ucmp.berkeley.edu/diapsids/dinomm.html>

FYI, a Google search using the argument 'perforate acetabulum' yields not only 3 pages or so of URLs (of which the above is one) but also asks if you meant 'perforated acetabulum' - and clicking on that search yields another two pages of hits.

Google.com is a VERY useful tool...

Virtually all dinosaurs have perforated acetabula, so ANY close up picture of a dinosaur pelvis should show this. For comparison it might be more helpful to find a picture of a pelvis of a very primitive dinosaur (like Lagosuchus?) with an imperforate acetaculum (or the pelvis of some non-dinosaur). The big question is whether the perforate acetabulum only arose once in dinosaur evolution. There are some indications that it evolved two or three separate times, and thus it may not be a true synapomorphy of Dinosauria.

Small correction

Well, you might want to extend that to basal archosaur/non-archosaur. Crocodylomorphs have perforate acetabula as well. I'd say that a good place to look for a solid acetabulum, is in any lepidosaur skeleton..