Tylosaurus was a large marine reptile that lived during the Late Cretaceous period, around 85 to 80 million years ago. Measuring up to 14 meters (46 feet) in length, it was one of the largest members of the mosasaur family. Tylosaurus had a long, streamlined body with powerful flippers, a deep tail fin, and a distinctive elongated snout. Its jaws were filled with sharp, conical teeth adapted for catching and eating a variety of prey, including fish, other marine reptiles, and possibly even seabirds. Fossils of Tylosaurus have been primarily found in North America, offering significant insights into the diversity and adaptations of marine reptiles in the Cretaceous seas.