Figure 3

The reflectance of gammarid eyes is much greater under coaxial illumination than non-coaxial illumination. Example gammarid for which measurements of body transmission and reflectance, as well as eye reflectance were obtained; (a) viewed under 10 × 10 magnification using transmission illumination, scale bar is 100 µm; (b) viewed with coaxial illumination, scale bar is 100 µm. (c) Reflectance and transmittance of the body (n = 19 individuals) and eye (n = 18 for coaxial and n = 10 for non-coaxial reflectance); lines indicate average of measurements, shaded areas indicate standard error of the mean. Inset shows that the highly reflective structures are between ommatidia. Photo credits: Pierre-Paul Bitton.