Phylogeographic structure across one of the largest intact tropical savannahs: Molecular and morphological analysis of Australia’s iconic frilled lizard Chlamydosaurus kingii

• Genetic data from five loci show three shallow genetic clades within frilled lizards.
• Clades are broadly consistent with clinal variation in frill color.
• Data from 279 specimens shows only subtle morphological differentiation between clades.
• Biogeographic patterns are consistent with other taxa in the Australian monsoon tropics.
• Extremely low divergences suggest recent gene flow between, and extensive gene flow within, clades.