Evolution What the Fossils Say and Why it Matters

CambrianOrdovicianSilurianDevonianMiss.Penn.Permian Triassic Jurassic

Hagfishes

Lampreys

Heterostracans

Osteostracans

Anaspids

Placoderms

Ratfish

Acanthodians

Bony fishes

Rhipidistians

Amphibians

Lungfish

Cretaceous Cenozoic

Hagfishhes

H

d

Cartilaginousfishes

Jawless

fishes

Jawed

fishes

Coelacanths

Ray-finned fishes

Sharks

FIGURE 9.1. Evolutionary history of fishes and other early vertebrates. (Drawing by Carl Buell)