An artist's impression shows the 15 metre (50 ft) long "sea monster" found in Arctic Norway that was the biggest of its kind known to science. With dagger-like teeth in a mouth large enough to bite a small car, the 150-million year old dinosaur-era pliosaur, a fierce marine repitle, was about five metres (16 ft 5 in) longer than the previous pliosaur record holder found in Australia, researchers said on February 27, 2008.