What feature characterizes *Xenoceratops*'s parietal ornamentation?
Answer
Blunt and somewhat knob-like bosses
The most striking diagnostic characteristic of *Xenoceratops* that supported its generic distinction lies in the specific structure of the posterior margin of its parietal shield, which forms the frill. While many Centrosaurines feature sharp spikes or hooks projecting backward or sideways from the frill edge, the structures observed on the *Xenoceratops* holotype were described as being notably blunt and resembling knobs or bosses. This unusual, less exaggerated ornamentation on the frill margin sets it apart anatomically from many of its close relatives within the Centrosaurinae lineage.
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