Brilliant camouflage: photonic crystals in the diamond weevil, Entimus imperialis

Bodo D. Wilts*, Kristel Michielsen, Jeroen Kuipers, Hans De Raedt, Doekele G. Stavenga

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

72 Citaten (Scopus)
563 Downloads (Pure)

Samenvatting

The neotropical diamond weevil, Entimus imperialis, is marked by rows of brilliant spots on the overall black elytra. The spots are concave pits with intricate patterns of structural-coloured scales, consisting of large domains of three-dimensional photonic crystals that have a diamond-type structure. Reflectance spectra measured from individual scale domains perfectly match model spectra, calculated with anatomical data and finite-difference time-domain methods. The reflections of single domains are extremely directional (observed with a point source less than 58), but the special arrangement of the scales in the concave pits significantly broadens the angular distribution of the reflections. The resulting virtually angle-independent green coloration of the weevil closely approximates the colour of a foliaceous background. While the close-distance colourful shininess of E. imperialis may facilitate intersexual recognition, the diffuse green reflectance of the elytra when seen at long-distance provides cryptic camouflage.

Originele taal-2English
Pagina's (van-tot)2524-2530
Aantal pagina's7
TijdschriftProceedings of the Royal Society of London. Series B, Biological Sciences
Volume279
Nummer van het tijdschrift1738
DOI's
StatusPublished - 7-jul.-2012

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