Fig. 8 in A new Arctic hadrosaurid from the Prince Creek Formation (lower Maastrichtian) of northern Alaska

Fig. 8. Jugal comparison of Ugrunaaluk kuukpikensis gen. et sp. nov. (A, UAMES 14174, right, size class 3; D, UAMES 4922, left, size class 1) from the Prince Creek Formation, Maastrichtian, Alaska; Edmontosaurus annectens Marsh, 1892 (B, ROM 53518, left, size class 2) from the late Maastrichtian Lance Formation, Wyoming, USA, in medial (B1) and lateral (B2) views; and adult Edmontosaurus regalis Lambe, 1917 (C, CMN 2289, left, reversed) from the late Campanian Edmonton Formation, Alberta, Canda. A, B1, C. Anterior processes in medial views, the dashed lines delineate the posterior border of the anterior process. In U. kuukpikensis this border is angled more strongly than in Edmontosaurus. D, B2. Left jugal in lateral view. Note that U. kuukpikensis has a shallower posterior constriction compared to E. annectens. B2 shows how the dorsal length and the posterior constriction are defined. E. Jugal regression analyses. Dorsal length versus posterior constriction of jugal. This suggests the shallower posterior constriction of U. kuukpikensis is not attributable to ontogeny.