After five years of research, Dr. Takuya Konishi of the Royal Tyrrell Museum of Palaeontology and colleague Dr. Michael Caldwell from the University of Alberta concluded that the mosasaurs they were studying – a group of large marine lizards that dominated the waters 90 - 65 million years ago – conformed to none of the previously known kinds. Instead, they determined these mosasaurs belonged to an entirely new genus.