Figure 5.  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 Download authors' original image