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The Arthropod Story Table of Contents   

Table of Contents
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1. Introducing the arthropods
Who are these arthropods, and why should we be interested in them?

2. What is an arthropod?
Learn the defining characteristics of arthropods.

3. Meet the Cambrian critters
Travel back in time to the origins of arthropods, and the explosion of new animal groups over a half billion years ago.

4. Tools for success: The exoskeleton and the jointed limb
How have basic arthropod characteristics contributed to the group's success?

5. An evolutionary constraint: Small size
Why haven't arthropods evolved to be as big as elephants?

6. Conclusion: Evolution and the arthropod
Review the stunning history of the arthropods.