A pair of paleobiologists have determined that the world’s most numerous and diverse vertebrates — ray-finned fishes — began their ecological dominance of the oceans 66 million years ago, aided by the mass extinction event that killed off dinosaurs.
A pair of paleobiologists have determined that the world’s most numerous and diverse vertebrates — ray-finned fishes — began their ecological dominance of the oceans 66 million years ago, aided by the mass extinction event that killed off dinosaurs.