Semirostrum ceruttii: Scientists Discover Extinct Porpoise with Unique Underbite

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.

The prehistoric marine animal, named Semirostrum ceruttii, is related to living crown porpoises.

The generic name Semirostrum refers to the animal’s unusual jaw – the rostrum is the lower half of the jaw. The species name honors Dr Richard Cerutti, a paleontologist at the San Diego Natural History Museum.
Source: Here