Figure 1. Phylogenetic relationships between the 28 clades (27 species) of Australian agamid lizards included in this study, with images of representative species from the Ctenophorus andDiporiphora & others (genera Amphibolurus ,Gowidon , Pogona , Rankinia , Tympanocryptis ) clades as well as basal Moloch horridus . Heatmap shows variation in the concentration of total carotenoids and total pteridines among species. Map shows extensive geographic sampling (186 skin samples from 79 individuals across 30 populations) against a measure of habitat productivity (annual mean aridity index: monthly ratio of precipitation to potential evaporation).