Two analyses of developmental patterning functions of leg and wing genes in a crustacean provide complementary support for the incorporation of proximal leg components into the body wall during the crustacean–insect transition, but lead to duelling models for which portion(s) re-emerged from the body as wings.
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The authors declare no competing interests.
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Smith, F.W., Jockusch, E.L. Into the body wall and back out again. Nat Ecol Evol 4, 1580–1581 (2020). https://doi.org/10.1038/s41559-020-01350-7