Researchers from Yale-NUS College in Singapore and University College Cork (UCC) in Ireland have analysed preserved scales from wing cases of two fossil weevils from the Late Pleistocene era (approx. 13,000 years ago) to better understand the origin of light-scattering nanostructures present in present-day insects.
source https://www.lifetechnology.com/blogs/life-technology-science-news/fossil-record-analysis-hints-at-evolutionary-origins-of-insects-structural-colours