Understanding Evolution: your one-stop source for information on evolution
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The Arthropod Story Table of Contents   

They’re all over the tree

This evolutionary tree shows that there were many other groups of animals whose origins date back to the Cambrian. In fact, the fossil record shows an "explosion" of new life forms originating during this time.

Many groups of animals have been found in Cambrian fossils

Let's take a closer look at two of the arthropod lineages and examine the reasons for their success.

Classifying Cambrian critters

Tools for success: The exoskeleton and the jointed limb

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