Jurassic
On sea and land, evolutionary trends which started in the Upper Triassic continued through the Jurassic. Archosaurian reptiles dominated the land biota. Reptile groups radiated and filled many niches. Dinosaurs, pterosaurs, marine reptiles (ichthyosaurs, plesiosaurs, turtles) all flourished. A recent discovery has shown that pliosaurs (a clade of large plesiosaurs) may have been top predators in the Upper Jurassic.