Paleontologists led by Dr Rachel Racicot of Yale University have described a new species of extinct porpoise that lived off the coast of what is now California during Pliocene, between 5 and 1.5 million years ago. This is an artist’s impression of Semirostrum ceruttii. Image credit: Bobby Boessenecker. The prehistoric marine animal, named Semirostrum ceruttii, is related to living crown porpoises. The generic name Semirostrum refers to the animal’s...