An osteological description of the syncranium and hyoid apparatus of Ameiva ameiva (Linnaeus, 1758) is presented. By comparison between males and females signiflcant intersexual differences were found in relation to: skull size, frontal, parietal and basisphenoid bones, interpterygoid opening and teeth number and mor-phology. Absence of pterygoid teeth in A. ameiva is verified out. The specimens used for this study carne from Chaco and Formosa provinces (Argentina).
Squamata; Teiidae; Ameiva ameiva; Neotropical región; skull