How were the teeth of Xiphactinus set, distinguishing it from later bony fishes?
Answer
Set in grooves rather than sockets
A critical anatomical feature distinguishing *Xiphactinus* from more advanced bony fishes is the setting of its teeth. Instead of being situated within distinct sockets as seen in later, more derived fish groups, the sharp, backward-curving teeth of *Xiphactinus* were set directly into grooves along the jaw structure. This morphology, identified as plesiomorphic, reflects an older, yet highly effective, adaptation suited for grasping and retaining struggling prey during active pursuit.
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