The horned lizard, Phrynosoma cornutum, was first desscribed by Harlan as Agama cornuta; in 1831, J. E. Gray transferred the species to the genus Phrynosoma. Much work has been done on the species. Many of the references to Phrynosoma cornutum are of a taxonomic nature, while references to its morphology are few and the material in the papers is scant. Description of the osteology of the skull are lacking.
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Detrie, Arthur J.
"Osteology Of The Skull Of Phrynosoma cornutum (Harlan),"
Field and Laboratory: Vol. 18
Available at: https://scholar.smu.edu/fieldandlab/vol18/iss4/3