By Rodrigo Pérez Ortega When dinosaurs and other large predators went extinct some 66 million years ago, lots of creatures evolved to take their place.
But unlike the plankton-hunting anchovies we eat in Caesar salads today, some ancient anchovies evolved into fish-eating predators, according to a new study.Researchers examined a 30-centimeter-long fossil embedded in a rock formation near Chièvres, Belgium, and another partial fossil from Pakistan’s Punjab province.
They were between 41 million and 54 million years old, and both shared a peculiar feature: a single saber tooth on the upper jaw.To get high-resolution images of the fish skulls, the researchers used micro–computed tomography—a scaled-down version of the technique doctors use
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