Paleontologists have described an unusual new species of mosasaur based on a fossilized partial jaw and associated tooth crowns from phosphatic deposits at Sidi Chennane, Oulad Abdoun Basin, Morocco. Stelladens mysteriosus. Image credit: Nick Longrich. The newly-discovered mosasaur swam in the Late Cretaceous seas of Morocco, approximately 67 million years ago. Dubbed Stelladens mysteriosus, the ancient reptile was around twice the size of a dolphin. It...