Ancient sea monster remains reveal oldest mega-predatory pliosaur
The fossils of a 170-million-year-old ancient marine reptile from the Age of Dinosaurs have been identified as the oldest-known mega-predatory pliosaur -- a group of ocean-dwelling reptiles closely related to the famous long-necked plesiosaurs. The findings are rare and add new knowledge to the evolution of plesiosaurs.
https://www.sciencedaily.com/releases/2023/10/231020182030.htm