How are the large, prominent teeth found in the upper jaw of Xiphactinus described in relation to movement?
Answer
They were fixed in place
The dentition of Xiphactinus clearly defined its raptorial feeding style. Specifically, the large, prominent teeth embedded in the upper jaw were fixed, meaning they were not designed to be retracted or replaced frequently like the dentition found in some other ancient predators, including certain sharks. These fixed teeth, which could reach lengths of about two inches, were primarily adapted for securing and gripping sizable prey items with devastating force. This configuration suggests a feeding strategy focused on immobilizing slippery or powerful victims through a powerful, immediate grip, allowing the fish to potentially swallow large portions of the prey whole.
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