Cover image: The invention of wings in insects is one of the major key transitions in animal evolution. Wings have fueled the unchallenged radiation of the most successful of all animal taxa, the Pterygota (winged insects). The cover shows the odonate Orthemis ferruginea, the Roseate Skimmer from North America. Photo by Heike Hadrys (Hannover). Submitted by Rob deSalle and Bernd Schierwater, "Key transitions in animal evolution."
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