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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