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Protochordates
Protochordates Passenger pigeon Bison 1 T. rex 2 Duckbilled Dinosaur Duckbilled Dinosaur 3 Archaeopteryx Archaeopteryx Sauropod 4 5 Neandertals 6 Paleozoic--early Precambrian Early Paleozoic Ostracoderms Trilobite Early Paleozoic 7 Paleozoic--early Paleozoic—mid, late Placoderms Paleozoic—mid, late Paleozoic—mid, late Paleozoic—mid, late Paleozoic—mid, late Tetrapods 8 Paleozoic—mid, late Paleozoic—mid, late Paleozoic—mid, late Paleozoic—mid, late Sailback tetrapods (Pelycosaurs) Paleozoic—mid, late Trilobites 9 Mesozoic Mesozoic Ichthyosaur Plesiosaur Mesozoic Mesozoic Pterosaur Ankylosaur Mesozoic Stegosaur Stegosaur 10 Mesozoic Stegosaur Tricerotops Mesozoic Sauropod Mesozoic Mesozoic 11 12 13
