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The arthropods
Almost six hundred million years ago, long before vertebrates existed, some sea-dwelling animals evolved a hard, armor-like body covering, and things just haven't been the same since. Those organisms were the ancestors of insects, spiders, centipedes, millipedes, the extinct trilobites, lobsters, and their relatives — an enormously successful group of organisms known as arthropods. And for better or worse, all arthropods have inherited some basic characteristics of those first ancestors, including their armor-like body covering — the exoskeleton (exo = outside).
| Fossil arthropods |
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Modern arthropods |
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Naroia |
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millipede |
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Waptia |
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spider |
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Habelia |
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crab |
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Leancholia |
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beetle |
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