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Fine structure of wing scales of butterflies, Euploea mulciber and Troides aeacus |
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| Authors: | Dechkrong Punyavee Jiwajinda Suratwadee Dokchan Paradorn Kongtungmon Mongkol Chomsaeng Natthaphol Chairuangsri Torranin Yu Chih-Chieh Hsiao Chien-Nan Shiojiri Makoto |
| Institution: | aBioresources and Biodiversity Section, Central Laboratory and Greenhouse Complex, Kasetsart University, Kamphaengsaen Campus, Nakhonpathom 73140, Thailand;bEnvironmental Entomology Research and Development Center, Kasetsart University, Kamphaengsaen Campus, Nakhonpathom 73140, Thailand;cElectron Microscopy Research and Service Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;dFaculty of Gems, Burapha University, Chantaburi Campus, Chantaburi 22170, Thailand;eDepartment of Industrial Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;fInstrument Technology Research Center, National Applied Research Laboratories, 20 R&D Rd. VI, Hsinchu Science Park, Hsinchu 30076, Taiwan, ROC;gKyoto Institute of Technology, 1-297 Wakiyama, 618-0091, Japan |
| Abstract: | Wing scales of male Euploea mulciber (E. mulciber) and Troides aeacus (T. aeacus) butterflies were investigated from interest in photonic crystal by scanning electron microscopy and optical reflectance measurement. On the basis of the structural observation, the colouration in different areas in their wings was discussed. It was particularly deduced that a violet-green iridescence characteristic of E. mulciber’s forewing is caused only in a wavelength range from ∼380 to ∼510 nm by multiple interference from a highly tilted, triple-layered cuticle arrangement on the brown scales. It was also found that T. aeacus does not produce a blue-green sheen such as observed by Troides magellanus because its scales have no multiple cuticle layers but microrib layers unable to produce any backscattering diffraction. |
| Keywords: | Butterfly Euploea mulciber Troides aeacus Photonic crystal Field-emission scanning electron microscopy Reflectance |
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