Parasaurolophus is a genus of ornithopod dinosaur from the Late Cretaceous Period of what is now North America , about 73-76 million years ago . Parasaurolophus ( , commonly also ; meaning `` near crested lizard '' in reference to Saurolophus ) is a genus of ornithopod dinosaur from the Late Cretaceous Period of what is now North America , about 76.5-73 million years ago .