Loss and recovery of wings in stick insects
Michael F. Whiting1, Sven Bradler2 & Taylor Maxwell3
Department of Integrative Biology, Brigham Young University, Provo, Utah 84602, USA
Institut für Zoologie und Anthropologie, Georg August Universität Göttingen, Germany
Washington University, Department of Biology, St Louis, Missuori 63130, USA
Correspondence to: Michael F. Whiting1 Correspondence and requests for materials should be addressed to M.F.W. (e-mail: Email: Michael_Whiting@byu.edu).
The evolution of wings was the central adaptation allowing insects to escape predators, exploit scattered resources, and disperse into new niches, resulting in radiations into vast numbers of species1. Despite the presumed evolutionary advantages associated with full-sized wings (macroptery), nearly all pterygote (winged) orders have many partially winged (brachypterous) or wingless (apterous) lineages, and some entire orders are secondarily wingless (for example, fleas, lice, grylloblattids and mantophasmatids), with about 5% of extant pterygote species being flightless2, 3. Thousands of independent transitions from a winged form to winglessness have occurred during the course of insect evolution; however, an evolutionary reversal from a flightless to a volant form has never been demonstrated clearly for any pterygote lineage. Such a reversal is considered highly unlikely because complex interactions between nerves, muscles, sclerites and wing foils are required to accommodate flight4. Here we show that stick insects (order Phasmatodea) diversified as wingless insects and that wings were derived secondarily, perhaps on many occasions. These results suggest that wing developmental pathways are conserved in wingless phasmids, and that 're-evolution' of wings has had an unrecognized role in insect diversification.
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