The oldest known dinosaur species appeared on Earth from the Three Siege Period, 243 million years ago.

The first dinosaurs appeared on Earth images 1
Lizard foot dinosaur Riojasaurus incertus.

  • Lizard foot dinosaur Riojasaurus incertus (227 million years ago): 10m long; weighing 1-2 tons.
  • Alwalkeria animal dinosaur maleriensis (230 million years ago): 1,5 m long; weighs 2kg.
  • Herrerasaurus is dinosaurs isschigualastennis (230 million years ago): 6m long; weighs 350kg.
  • Pisanosaurus mertii (230 million years ago): 1m long; weighs 3-9kg.
  • Staurikosaurus pricei (230 million years ago): 2.25m long; weighs 50kg.
  • Chromogisaurus novasi lizard legs (230 million years ago): 2m long; weighs 20kg.
  • Zooplankton Eoraptor lunensis (231 million years ago): 1m long; weighs 10kg.
  • Saturnalia tupiniquim dinosaur legs (232 million years ago): 1.5m long, weighs 10kg.
  • Spondylosoma absconditum (242 million years ago): 2m long; weighs 20kg.
  • Nyasasaurus parringtoni (243 million years ago): 2-3m long; weighs 80kg.