leprocrastinateur:

Membracidae (treehoppers). Morphological diversity in treehoppers is conveyed by the helmet. © CNRS / Nicolas Gompel.
Research  : Body plan innovation in treehoppers through the evolution of an extra wing-like appendage. Prud’homme et al. Nature, 473: 83-86 (05 May 2011). 

Info en français : ici.