DOI: 10.5061/dryad.5mkkwh7gw
title: Structural data and spectra for: Micro-optics in the cuticle of matt-green <em>Chrysina</em> beetles create spatially-projected images

description: Matt-green Chrysina beetles show left-handed circularly polarised light
 reflections produced by a helicoidal chitin-protein fibres structure. We
 provide tables for the Structural Pitch (a full 360 degrees turn) of the
 helicoid of C. chrysopedila, C. boucardi and C. bruyeai. These species
 have an exocuticle with small craters and rims that spread local specular
 reflections in many directions and show up under the microscope as a
 polygonal structure. We provide reflection spectra measured at different
 depths by using a microscope with a coupled variable-aperture
 spectrophotometer. Also, we provide circularly polarized spectra measured
 at the crater centres, off-centres at the slope, and at the rims
 separating the craters.
description: # Structural data and spectra for: Micro-optics in the cuticle of
 matt-green *Chrysina* beetles create spatially-projected images Dataset
 DOI: [10.5061/dryad.5mkkwh7gw](https://doi.org/10.5061/dryad.5mkkwh7gw) ##
 Description of the data and file structure Structural data and spectra for
 three matt-green Chrysina beetles. ### Files and variables #### File:
 Table_S-01a.xlsx **Description:** *Chrysina chrysopedila* bottom of crater
 Bouligand structural pitches measured using spherical mirror fit. Fig. 2
 ##### Variables * chrysopedila depth, µm * chrysopedila full pitch, µm *
 chrysopedila full pitch Loess Residuals, µm span =0.7 * chrysopedila full
 pitch, µm Loess Fit span = 0.7 #### File: Table_S-01b.xlsx
 **Description:** *Chrysina boucardi* bottom of crater Bouligand structural
 pitches measured using spherical mirror fit. Fig. 2 ##### Variables *
 boucardi depth, µm * boucardi full pitch, µm * boucardi full pitch, µm
 Loess Residuals span = 0.7 * boucardi full pitch Loess Fit, µm span = 0.7
 * boucardi full pitch, µm Loess Residuals span = 0.5 * boucardi full pitch
 Loess Fit, µm span = 0.5 #### File: Table_S-01c.xlsx
 **Description:** *Chrysina bruyeai* bottom of crater Bouligand structural
 pitches measured from centres of dark/bright bands, Fig. 2 ##### Variables
 * bruyeai depth, µm * bruyeai full pitch, µm * bruyeai full pitch, µm
 Loess Residuals span = 0.7 * bruyeai full pitch Loess Fit, µm span = 0.7
 #### File: Table_S-02a.xlsx **Description:** *Chrysina chrysopedila*
 non-polarized spectra (VIS) at different focusing depths in µm Fig 4 #####
 Variables * Wavelength, nm * chrysopedila +2.0 µm * chrysopedila +1.5 µm *
 chrysopedila +1.0 µm * chrysopedila +0.5 µm * chrysopedila 0.0 µm *
 chrysopedila -0.5 µm * chrysopedila -1.0 µm * chrysopedila -1.5 µm *
 chrysopedila -2.0 µm * chrysopedila -2.5 µm * chrysopedila -3.0 µm *
 chrysopedila -4.0 µm * chrysopedila -5.0 µm * chrysopedila -6.0 µm ####
 File: Table_S-02b.xlsx **Description:** *Chrysina boucardi* non-polarized
 spectra at different focusing depths in µm Fig 4 ##### Variables *
 Wavelength, nm * boucardi +2.0 µm * boucardi +1.5 µm * boucardi +1.0 µm *
 boucardi +0.5 µm * boucardi 0.0 µm * boucardi -0.5 µm * boucardi -1.0 µm *
 boucardi -1.5 µm * boucardi -2.0 µm * boucardi -2.5 µm * boucardi -3.0 µm
 * boucardi -4.0 µm * boucardi -5.0 µm * boucardi -6.0 µm #### File:
 Table_S-03.xlsx **Description:** *Chrysina chrysopedila* cell polarized
 spectra: VIS (Non polarized), L (LHCP), R (RHCP) data for L and R used up
 to 800 nm in Fig. 6 ##### Variables * Wavelength, nm * chrysopedila center
 L Reflectance, % * chrysopedila center R Reflectance, % * chrysopedila
 center VIS Reflectance, % * chrysopedila rim L Reflectance, % *
 chrysopedila rim R Reflectance, % * chrysopedila rim VIS Reflectance, % *
 chrysopedila slope L Reflectance, % * chrysopedila slope R Reflectance, %
 * chrysopedila slope VIS Reflectance, % #### File: Table_S-04.xlsx
 **Description:** *Chrysina boucardi* cell polarized spectra: VIS (Non
 polarized), L (LHCP), R (RHCP). Data for L and R used up to 800 nm in Fig.
 6 ##### Variables * Wavelength, nm * boucardi center L Reflectance, % *
 boucardi center R Reflectance, % * boucardi center VIS Reflectance, % *
 boucardi rim L Reflectance, % * boucardi rim R Reflectance, % * boucardi
 rim VIS Reflectance, % * boucardi slope L Reflectance, % * boucardi slope
 R Reflectance, % * boucardi slope VIS Reflectance, % #### File:
 Table_S-05.xlsx **Description:** *Chrysina bruyeai* cell polarized
 spectra: VIS (Non polarized), L (LHCP), R (RHCP). Data for L and R used up
 to 800 nm in Fig. 6 ##### Variables * Wavelength, nm * bruyeai center L
 Reflectance, % * bruyeai center R Reflectance, % * bruyeai center VIS
 Reflectance, % * bruyeai rim L Reflectance, % * bruyeai rim R Reflectance,
 % * bruyeai rim VIS Reflectance, % * bruyeai slope L Reflectance, % *
 bruyeai slope R Reflectance, % * bruyeai slope VIS Reflectance, % ###
 Other: Blank Cells are noted as "null"