What prominent anatomical feature projects backward from the skull of Xenacanthiformes?
Answer
A backward-pointing spine.
One of the most distinguishing and characteristic features defining the group Xenacanthiformes, to which Xenacanthus belongs, is the presence of a prominent spine that projects specifically backward from the rear of the skull. Although paleontologists continue to debate its exact functional role, the presence of this spine is a key diagnostic characteristic for this order of ancient sharks. This structural element further supports the conclusion that the creature was not specialized for the high-speed pursuit typical of some other predatory fish.
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