Guerra-Fuentes RA, Roscito JG, Nunes PMS, Oliveira-Bastos PR, Antoniazzi MM, Carlos J, Rodrigues. 2014. Through the Looking Glass: The Spectacle in Gymnophthalmid Lizards. Anat. Rec. 297(3): 496-504. Hiller U. 1998. The conjunctiva and nictitating membrane of the eyelids in some reptilian species: a SEM overview. Eur. J. Morphol. 36(3): 165-171.