Join us as we unpack the armored giant Dunkleosteus terrelli, a late Devonian predator whose four-bar jaw mechanism could snap open in about 20 milliseconds and deliver extraordinary bite force. We’ll reassess famous size estimates—from a legendary 33 feet to a more plausible 11–13.5 feet based on complete skulls and pelvic girdle placement—and explore what that means for its hunting strategy as an open-ocean, active pursuer. Along the way, we’ll examine how new fossil discoveries refine our view of early vertebrate predation and the evolution of armored top predators in the Devonian seas.

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