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Speciation, the formation of new and distinct species in the course of evolution. Speciation involves the splitting of a single evolutionary lineage into two or more genetically independent lineages.
Rapid speciation. 1  Â¼ of all insect species are parasitic on plants. 2  Â¼ of all insects are parasitic on the above insects. 3  In addition, many insects and other invertebrates are parasitic on other animals.