and a land bridge connected the island to Cape York. The study upholds C. kingii as one species with the different populations being "shallow allopatric clades". The following cladogram is based on Pyron and colleagues (2013). Description The frilled lizard grows to a total length of around and a head-body length of , and weighs up to . It has a particularly large and wide head; a long neck to accommodate the frill; long legs and a tail that makes most of its total length. The species is sexually dimorphic, males being larger than females and having proportionally bigger frills, heads and jaws. The corners of the frilled lizard's eyes are pointed and the rounded nostrils face away from each other and angle downwards. Most of the lizard's scales are keeled, having a ridge down the centre. From the backbone to the sides, the scales alternate between small and large. The distinctive frill is a flap of skin that extends from the head and neck and contains several folded ridges. When fully extended, the frill is disc-shaped and can reach over four times the length of the animal's torso in diameter. Otherwise it wraps around the body. The frill is laterally symmetrical; the right and left sides are attached at the bottom in a V-shape, and cartilage-like connective tissue (Grey’s cartilage) connects the top ends to each side of the head near the ear openings. The frill is supported by rod-like hyoid bones, and is spread out by movements of these bones, the lower jaw and Grey’s cartilage. This structure mainly functions as a threat display to predators and for communication between individuals. It can also act as camouflage when folded, but this is unlikely to have been a consequence of selection pressure. The frill may be capable of working like a directional microphone, allowing them to better hear sounds directly in front of them but not around them. There is no evidence for other suggested functions, such as food storage, gliding or temperature regulation. Frilled lizards vary between grey, brown, orangish-brown, and black dorsally, the underside being paler white or yellow. Males have a dark belly but a lighter chest. The underside and lateral sides of the species are sprinkled with dark brown markings that merge to create bands on the tail. The colours of the frills vary based on range; lizards west of the Ord River have red-coloured