Evolution of Vertebrates
Pelycosaurs
(extinct)
Early reptiles
(extinct)
350
300
250
200
150
100
50
Quaternary
Tertiary
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
0
Thecodonts
(extinct)
Therapsids (extinct)
Sauropsids
Synapsids
Dinosaurs (extinct)
Turtles
Lizards
Snakes
Tuataras
Crocodiles Birds Mammals
Fig.: Representative evolutionary history of vertebrates through geological periods
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