The Banded rock lizard (Petrosaurus mearnsi) is an extremely flat bodied lizard with an olive, brown or grey dorsum and white or bluish spots on dorsum. It has a single black collar, a banded tail, and granular scales on its body with keeled tail and limb scales. It is 6.2 to 8.7 cm long. Males have more pronounced throat patterns and brighter blue coloring than females.
These lizards are associated with boulder hillsides.
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