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Significance Polyploidy or whole genome duplication (WGD) is considered a major force in plant evolution, but less important in animals. The most diverse group of animals, the insects, are thought to have evolved without ever experiencing a WGD. Our analyses of diverse genomic data found evidence for 18 ancient WGDs and at least six other bursts of gene duplication during the evolution of insects. Further, we found that the functional patterns of gene retention and loss in these insect genomes are consistent with the signatures of WGDs. The expanding collection of genomic data for insects will provide many opportunities to further evaluate the evidence for WGDs and understand the impact of polyploidy on insect evolution.

Multiple large-scale gene and genome duplications during the evolution of hexapods