The Devonian Ocean: When Fish Started a Prehistoric Arms Race

Around 400 million years ago, the oceans entered a prehistoric arms race. Placoderms covered their bodies in heavy armor. Early sharks chose speed and replaceable teeth. Bony fish rapidly diversified, while lobe-finned fish began moving toward the shallows—and eventually toward land. Above them all was Dunkleosteus, an armored predator with no ordinary teeth. Instead, its jaws carried sharpened bone plates that closed like enormous biological shears. But even the strongest armor could not protect the Devonian rulers when the oceans began losing oxygen. Enter the Age of Fishes and discover how the first great fish empires rose, fought and disappeared. #Devonian #Dunkleosteus #PrehistoricOcean #AncientFish #Paleontology #ExtinctAnimals