Elasmosaurs themselves were some of the some of the largest plesiosaurs–or a group of extinct marine reptiles–to have ever lived. “Plesiosaur fossils have been known for decades in British Columbia,” O’Keefe said in a statement. Our new research published today finally solves this mystery.”[ Related: This giant polar reptile once stalked an ancient super-ocean. ] “With the naming of Traskasaura sandrae, the Pacific Northwest finally has [a] Mesozoic reptile to call its own,” O’Keefe added. “Fittingly, a region known for its rich marine life today was host to strange and wonderful marine reptiles in the Age of Dinosaurs.”