Yellow structurally modified fluorescence in the longhorn beetles Celosterna pollinosa sulfurea and Phosphorus virescens (Cerambycidae)

► We examine structurally modified fluorescence in two longhorn beetles. ► Reflection and emission are complementary processes in the final visual aspect. ► The specific three-dimensional photonic structure of the scales is the keystone. ► Structure impacts the spatial angular distribution of reflected and emitted light.