Evolution What the Fossils Say and Why it Matters

Coelacanths

Devonian

415 360 317 300 251 200 145 65 0

Miss. Penn. Permian Triassic Jurassic Cretaceous Cenozoic

Lungfish

Temnospondyls

Lissamphibia

Nectridians

Microsaurs

Anthracosauroids

Amniotes

Ichthyostegids

Tetrapods

Rhipidistians

Frogs

Apodans

Salamanders

Mammals

Reptiles

Synapsids

FIGURE 10.1. The relationships of the four-legged animals, or tetrapods. (Drawing by Carl Buell)