New dolphin fossil makes a splash

The skull and jaws of Isthminia panamensis, a new fossil dolphin from Panama, provides clues to the evolution of river dolphins in the Americas.
Nicholas D. Pyenson/NMNH Imaging/Smithsonian Institution
The skull and jaws of Isthminia panamensis, a new fossil dolphin from Panama, provides clues to the evolution of river dolphins in the Americas.
Nicholas D. Pyenson/NMNH Imaging/Smithsonian Institution