Morphology of the jugal articulation surface of the maxilla.
State 1: joint located on a promontory (rectangles) dorsal and rostral to the ectopterygoid shelf, with
a caudolaterally directed corner (arrow). Exemplified here in a specimen of Bactrosaurus johnsoni
(NHM 6553) in A, lateral and B, dorsal view. C, cf. Telmatosaurus sp. (FGGUB R1010), lateral view.