Note: This generic entry is used for extinct carnivorous Marine reptiles.
Pliosauroidea is an extinct clade of marine reptiles. Pliosauroids, also commonly known as pliosaurs, are known from the Jurassic and Cretaceous Periods. These swimming reptiles were not dinosaurs, but distant cousins of modern turtles. The Plesiosauria or plesiosaurs are an order or clade of Mesozoic marine reptiles.