Crustaceans abundant in Jurassic. Anapsids Synapsids Eurapsids Diapsids Terrestrial vertebrate groups bridged the Permian-Triassic extinction event. Recently, paleontologists at the Field Museum of Natural History in Chicago, announced the discovery of what could be the earliest dinosaurs from Madagascar. Sauropods were quadrupedal herbivores first found in Jurassic. Bipedal and quadrupedal ornithiscians evolve as late Triassic herbivores.
Ornithopods are the bipedal group.
Using computer-modeling techniques, scientists at Sandia National Laboratories have reconstructed the crest of Parasaurolophus based upon the discovery of a unique specimen. It is uncertain whether the Parasaurolophus had vocal cords. Therefore, a variation of sounds with and without vocal cords have been simulated for this organism. This group of vertebrates is the first to achieve true flight . The University of California Museum of Paleontology offers information on Mesozoic terrestrial ecology .