Ear region of: two specimens of Stenocercus canastra sp. nov.: (12) MPEG 31738, (13) MZUSP 88873, holotype; (14) S. tricristatus, MNHN 6825, holotype; (15) S. dumerilii, MPEG 6036; (16) S. quinarius, MZUSP 94069, holotype; (17) S. squarrosus, MZUSP 94056, holotype. (Ty) Tympanic membrane, (Sc) enlarged ear scale. Note the evident enlarged preauricular scale in S. canastra sp. nov., the relatively small and keeled preauricular scale in S. tricristatus and the virtual absence of this scale in S. dumerilii, S. quinarius, and S. squarrosus.