Re: MORE BASAL ORNITHISCHIAN STUFF

[TWILLIAMS@canr1.cag.uconn.edu]

On _Pisanosaurus_...
 
> Didn't say they were exactly like heterodontosaurid teeth. That would be too
> easy. But they lack cingulum, are closely spaced, and are more or less chisel-
> shaped--as in heterodontosaurids and unlike virtually all other ornithischian
> teeth, except, interestingly, psittacosaur & protoceratopid teeth. Differ in
> details, of course, as might be expected.

Actually, I like the idea of heterodontosaurs as basal 
marginocephalians.  I've seen this brought up several times, and not 
just on this list.  Does anybody have a reference for when this was 
first proposed?

While on the topic, what's the latest on _Chaoyangosaurus_?  Is 
Sereno about to describe this thing as a ceratopsian more derived 
than the psittacosaurs?