What feature was notably absent along the midline bar of the Xenoceratops frill?
Answer
Any ornamentation
A specific characteristic distinguishing the *Xenoceratops* frill design from some of its relatives is the notable absence of certain structures along a key area. Specifically, the text points out the lack of any ornamentation along the midline bar of the frill itself. This contrasts with the specific features found elsewhere on the frill, such as the two thick central knobs and the single long lateral spikes, reinforcing that its display structures were configured differently than those of later or more extravagant centrosaurines.
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