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251.9–201.4 MYA
Triassic
Dinosaurs' origin story. Small, fast, opportunistic early forms like Eoraptor and Herrerasaurus appear alongside the archosaurs and early mammals they'll eventually outcompete.
How it ends
Triassic–Jurassic extinction
Clears out most competing archosaur lineages, leaving dinosaurs the dominant large land animals for the next 135 million years.
Genera from this era
110 cataloguedAsilisaurusThecodontosaurusLutungutaliNyasasaurusLewisuchusPseudolagosuchusGamatavusDiodorusBagualosaurusAnteavisPendraigHalticosaurusAlwalkeriaTeyuwasuAmanasaurusChromogisaurusSaturnaliaAhvaytumHuayracursorSaltopusPanphagiaFrenguellisaurusHerrerasaurusPampadromaeus
See all 110 in the full index →