Abstract
Trait Development One of the most pronounced examples of a sexually selected trait is the prothoracic horns of scarab beetles, which, in the most extreme cases, can be nearly half as long as the length of the beetle. It is fairly easy to understand how selection might have shaped these horns, but understanding how development shaped them from a hornless ancestor is a much more complex proposition. Hu et al. show that these horns are generated from wing homologs and argue that many other insect traits may have followed similar transcriptional paths (see the Perspective by Nijhout). Science , this issue p. [1004][1]; see also p. [946][2] [1]: /lookup/doi/10.1126/science.aaw2980 [2]: /lookup/doi/10.1126/science.aaz9010
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