The first dinosaurs appeared on Earth

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

Lizard foot dinosaur Riojasaurus incertus.

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