Platysomus parvulus, a species of ray-finned fish that lived 310 million years ago, had a unique way of eating never seen in ray-finned fish from that time — a ‘tongue bite’, using a special set of teeth on the floor and roof of the mouth to help it crush and chew tough food like shells or insects. An artist’s impression of Platysomus parvulus. Image credit: Joschua Knüppe. Platysomus parvulus lived at the beginning of the Pennsylvanian...