Classification of the Dinosauria Dinosaurs are vertebrates Evolve - PDF document

Classification of the Dinosauria Dinosaurs are vertebrates • Evolve in the Cambrian along with other multicellular animals • Tissues mineralized with calcium phosphate - teeth, bones, spines, plates, scutes • Spinal cord usually protected by vertebrae. • Cephalized - distinct head with sensory organs and mouth • Eyes • Mobile All vertebrates are fish

Evolution of the Tetrapod Limb “Lobe-fin” fish Tetrapods

Two major dinosaur clades based on hip structure “Lizard-hipped” “Bird-hipped”

Tetanurae

Scelidosaurus Scutellosaurus Detailed and unique similarity of the keels and ventral excavations EXCAVATED KEEL

Ankylosauria broad skull with horns tail club Ankylosaur body spines narrow skull Nodosaur

Cerapoda