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Re: ANKYLOSAURS AND REVERSALS

> Tetanurae@aol.com wrote:

> > Jon Woolf writes:
> >  <<You say that the perforate acetabulum is a diagnostic feature for
> > Dinosauria --
> >  that is, it's one of the apomorphies that show Dinosauria is a real group,
> > and also
> >  one of the apomorphies that can be used to identify a member of that group.
> > You
> >  also say that ankylosaurs don't have this apomorphy.  Yet, ankylosaurs are
> > still
> >  classified as dinosaurs.  Why?>>
> >
> > Because ankylosaurs REVERSED this feature.
> 
 The Jurassic ankylosaurid Mymoorapelta maysi has a partially closed
 acetabulum.

 Jim Kirkland