A Basal Lithostrotian Titanosaur (Dinosauria: Sauropoda) with a Complete Skull: Implications for the Evolution and Paleobiology of Titanosauria
Fig 31
Isolated titanosaur cranial elements from the Cretaceous Chubut Group of southern Chubut Province, central Patagonia, Argentina.
Left premaxilla (UNPSJB-PV 669) in lateral (A) and medial (B) views (modified and redrawn from Powell et al. [51]:fig. 1h, i). Partial left maxilla of Campylodoniscus ameghinoi (MACN A-IOR63) in lateral (C), medial (D), and ventral (occlusal, E) views (modified and redrawn from Huene [9]:pl. 40, fig. 1a–c). Left maxilla (UNPSJB-PV 583) in lateral (F), medial (G), and ventral (occlusal, H) views (modified and redrawn from Sciutto and Martínez [53]:fig. 7; note that a single tooth has been exposed via preparation since that paper was published). Specimens UNPSJB-PV 669 and 583 were unambiguously recovered from the Lower Member of the Bajo Barreal Formation, at the Estancia Ocho Hermanos and Cañadón de Las Horquetas localities, respectively. MACN A-IOR63 was collected from the western flank of the Sierra de San Bernardo west of Lago Musters (i.e., in the vicinity of the Estancia Ocho Hermanos); unfortunately, however, its stratigraphic position within the Chubut Group is not known [7,9]. Scale bars = 5 cm in A–E; 10 cm in F–H.