Amphibians and squamate reptiles from the late early Miocene (MN 4) of Béon 1 (Montréal-du-Gers, southwestern France) Author Rage, Jean-Claude UMR CNRS 5143, Département Histoire de la Terre, Muséum national d’Histoire naturelle, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) jcrage @ mnhn. fr jcrage@mnhn.fr Author Bailon, Salvador UMR CNRS 6569, Laboratoire départemental de Préhistoire du Lazaret, 33 bis boulevard Franck Pilatte, F- 06300 Nice (France) sbailon @ lazaret. unice. fr text Geodiversitas 2005 27 3 413 441 journal article 10.5281/zenodo.5378363 1638-9395 5378363 Ophisaurus sp. ( Fig. 4C ) MATERIAL EXAMINED. — 1 fragmentary left dentary (Béon 2004 LT 49), and perhaps 1 pterygoid (Béon 2004 LT 50) and 20 vertebrae (Béon 2004 LT 51, 52). COMMENTS On the dentary, the subdental shelf and alveolar surface of the parapet form a single, inclined surface; as a result, the implantation of teeth is subpleurodont. The lamina horizontalis does not project medial to the bases of teeth. The teeth are conical; their apices are pointed, slightly recurved and not striated. Such teeth are reminiscent of those of Ophisaurus ( sensu Klembara 1979 , 1981 ; i.e. Dopasia Gray, 1853 included) of the European type . But a more precise identification is impossible. One pterygoid and 20 vertebrae or so, that display the anguine morphology, are tentatively assigned to this taxon on the basis of size consistency. Moreover, the centrum is less widened anteriorly and the ventral surface more convex than in Pseudopus , and the subcentral ridges are slightly concave in ventral aspect.