Cambrian (543 - 490 million years ago) * Anomalocaris * Trilobites * Haikouichthys Ordovician (490 - 443 million years ago) * Cameroceras * Megalograptus Silurian (443 - 417 million years ago) * Cephalaspis * Brontoscorpio * Pterygotus Devonian (417 - 354 million years ago) * Dunkleosteus * Stethacanthus * Hynerpeton * Hyneria Carboniferous (354 - 290 million years ago) * Meganeura * Petrolacosaurus * Arthropleura * Proterogyrinus Permian (290 - 248 million years ago) Triassic (248 - 206 million years ago) Jurassic (206 - 144 million years ago)