What unique structural characteristic is noted on the rear margin of the Xenoceratops frill?
Answer
Prominent spikes or hooks protruding backward
The rear margin of the frill belonging to Xenoceratops is characterized by a highly distinctive feature: the presence of prominent spikes or hooks that project backward from the bone structure. This ornamentation contributes significantly to the 'strange' aspect of its facial display mentioned in its name. This contrasts with the typical configurations found in some other contemporary centrosaurines, reinforcing its unique morphological standing even among its closer relatives.
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