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Nature 415, 848-849 (21 February 2002) | doi:10.1038/415848a

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Evolutionary biology: How insects lose their limbs

Mike Levine

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Evolution has produced marvellous variety in the arthropods, and in their various appendages. The evolutionary processes are themselves proving highly diverse.

From the standpoint of diversity in form and sheer number, the arthropods are the most successful animals on Earth. They embrace four remarkable groups: trilobites (sadly extinct), insects, crustaceans (shrimp, lobsters, crabs and so on), and chelicerates (horseshoe crabs, spiders and scorpions).