Chromaticity diagrams of lungfish cone photoreceptor colour space. Calculations were made for juvenile (A, B) and adult (C, D) lungfish, both with (A, C) and without (B, D) the filtering effects of the yellow ellipsoidal and red oil droplet spectral filters in the MWS and LWS cones. The black star in each diagram is the achromatic point. Large spheres/circles are the body colours (brown, orange, red), rocks and sand substrate (grey) and macrophytes (green) shown in Figs. 4B, C. Small circles represent monochromatic loci at 5nm intervals across the lungfish-visible spectrum. Note the increased separation of the object reflectance spectra and the displacement of the monochromatic loci towards the vertices in both juveniles (B) and adults (D) with spectral filters, relative to the situation without the effects of spectral filters. See Fig. 2 for explanation of abbreviations.
Hart et al. BMC Ecology 2008 8:21 doi:10.1186/1472-6785-8-21