Fig. 1 in Redescription of the type specimens for the Late Jurassic rhynchocephalian Opisthias rarus and a new specimen of Theretairus antiquus from Quarry 9, Morrison Formation, Wyoming, USA

Fig. 1. Teeth in the type specimens of the rhynchocephalian Opisthias rarus Gilmore, 1909, Quarry 9, Como Bluff, Wyoming, USA, Upper Jurassic. A. USNM 2860 (holotype), nearly complete left dentary, in labial (A1, A4), lingual (A2, A5), and occlusal (A3, A6) views. B. USNM 2858 (paratype), partial left dentary, in labial (B1, B4), lingual (B2, B5), and occlusal (B3, B6) views. C. Fragment of rock matrix belonging to the holotype. D. Holotype when it is superimposed to the rock matrix.