Nihohae matakoi’s tusk-like teeth suggest adaptive advantages for horizontally procumbent teeth in ancient dolphins. An artist’s impression of Nihohae matakoi. Image credit: Daniel Verhelst. Nihohae matakoi lived during the Late Oligocene epoch, approximately 25.2 million years ago. This extinct dolphin had a long rostrum and symmetrical, conical, procumbent tusk-like teeth. “The diversity of body sizes and feeding strategies in living odontocetes...
