What distinguishing feature is noted about the midline bar of the *Xenoceratops* frill?

Answer

It is smooth, lacking any bumps or adornments

A key characteristic setting *Xenoceratops* apart is that the midline bar of its parietal bone, often ornamented in other centrosaurines, appears to be smooth.

What distinguishing feature is noted about the midline bar of the *Xenoceratops* frill?
paleontologyFeaturedinosaurXenoceratops