The frilled shark has a long, eel-like body that can grow up to 6.5 feet (2 meters) in length. The body is dark brown or gray, with a cylindrical shape that tapers into a flattened tail.

These rare deep-sea fish dwell 200 to 2,000 meters deep. The frilled shark, a rare deep-sea “living fossil,” resembles an eel and was spotted in 2007 near Japan's surface, possibly due to ...