Biology Today — January 2018

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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