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Phrynosoma (Doliosaurus) platyrhinos
Small to medium sized lizard with off-white horns behind and to the side of the head, darker horns on its back and a spiky tail. Stripe runs the length of its back, and there are four short white markings on the back (two on each side).
Spotted in sandy ground around Horseshoe bend in Arizona.
Thanks for you help identifying this. Have just followed the link you provided - really useful, clear and concise website. Thanks.