Re: Notarium question

["David Marjanovic" <david.marjanovic@gmx.at>]

> The pterosaur notarium articulation is a new structure, that is, one not
> present on Ichthyostega. I'm trying to think of other such examples in
> tetrapods, but I'm coming up almost blank.

There aren't many, AFAIK. The mammalian 2nd jaw joint ( = only jaw joint in
the crown group, between squamosal and dentary) is one. And the teeth on the
palatal rami of the premaxillae of *Haptodus*
http://tolweb.org/tree/eukaryotes/animals/chordata/synapsid_lichen/synapsida_synapomorphies.html
 -
- pmx teeth are normal, teeth on the palate are normal, but palatal teeth on
the pmx are AFAIK unique. (Unfortunately. A few denticles on mine would be
very practical for munching hard stuff like cornflakes. :-} )

Or do you mean new bones, too? Could the sternum be one, er, two?