Papilio belongs to the impressive Swallowtail butterflies or Nymphalidae. The surface of a wing scale displays very fine veins. The inside of this scale is made up of many layers of chitin that have an exactly defined, same distance to each other. If light hits on it, a strong, green iridescence originates from interferences inside the scale.
Scanning electron microscope, magnification 33 000:1
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© Oliver Meckes