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Fig. 11 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 11. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979 (ROM 66180), from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; lateral wall of neurocranium showing the prominent overhang of the crista prootica in right lateral (A1) and oblique right posteroventral (A2) views.

Fig. 9 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 9. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; partial skull of ROM 60261 in left lateral view.

Fig. 8 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 8. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; partial skull of ROM 60261 in anterior view.

Fig. 6 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 6. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA (A–C) and Brachylophosaurus canadensis Sternberg, 1953, from Oldman Formation (Campanian) of Alberta, Little Sandhill Creek, Canada (D); detail of anterior margins of dorsotemporal fenestrae showing the variable development of overhanging ledges. A. ROM 66181, in oblique left posterodorsal view. B. ROM 60260, in oblique right posterodorsal view. C. ROM 66180, in posterodorsal view. D. CMN 8893, in oblique right posteroventral view, detail of overhanging ledge viewed through the right lateral temporal fenestra. Scale bars 20 mm.

Fig. 3 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 3. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979 (ROM 66182) from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; disarticulated partial nasals. A. Paired posterior parts of nasals in dorsal (A1), anterior (A2), ventral (A3), and medial A4) views. B. Middle part of a nasal in lateral view. C. Anterior part of a nasal in lateral view.

Fig. 2 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 2. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; partial crania in dorsal view. A. ROM 66182. B. ROM 66181. C. ROM 66180. D. ROM 60261. E. ROM 60260.

Fig. 1 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 1. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; partial crania in right lateral view. A. ROM 66182. B. ROM 66181. C. ROM 60261. D. ROM 60260. E. ROM 66180.

Fig. 10 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 10. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979 (ROM 60261), from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; lateral wall of neurocranium showing possible variation in the position of cranial nerve VII in left lateral (A1) and right lateral (A2) views.

Fig. 4 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 4. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979 (ROM 66180), from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; partial skull of in anterior (A1) and anterodorsal (A2) views, with schematic interpretation of prefrontal–nasal crest morphology.

Fig. 12 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 12. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; skulls in posterior view A. ROM 60261. B. ROM 66180. ROM 66180 is photographed in a slightly more posterodorsal perspective than ROM 60261; in actuality, the basipterygoid processes of both specimens project ventral to the occipital condyle.

Fig. 13 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 13. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; basicrania in ventral view. A. ROM 66182. B. ROM 60261. C. ROM 60260. D. ROM 66180. Arrows point to the contact between the basisphenoid (anterior) and basioccipital (posterior), and illustrate the variable orientation of this contact. Scale bars 20 mm.

Fig. 7 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 7. Dorsotemporal bar of hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979 (ROM 60261, A; ROM 66180, C), from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; compared to Brachylophosaurus canadensis Sternberg, 1953 (CMN 8893, B) from the Oldman Formation (Campanian) of Alberta, Little Sandhill Creek, Canada. A, B1 in right lateral view; B2, C in dorsal view. Scale bars 20 mm.

Fig. 5 in Ontogeny and variation in the skull roof and braincase of the hadrosaurid dinosaur Maiasaura peeblesorum from the Upper Cretaceous of Montana, USA

Fig. 5. Hadrosaurid dinosaur Maiasaura peeblesorum Horner and Makela, 1979, from the Two Medicine Formation (Campanian), Linster Quarry, Montana, USA; detail of frontal morphology showing the variable development of frontal depressions. A. ROM 66182, in anterodorsal view. B. ROM 66181, in oblique right anterodorsal view. C. ROM 66180, in oblique right posterodorsal view. Scale bars 20 mm.

Fig. 10 in New hadrosaurid dinosaurs from the uppermost Cretaceous of northeastern China

Fig. 10. The hadrosaurid dinosaur Sahaliyania elunchunorum gen. et sp. nov. from the Upper Cretaceous Yuliangze Formation at the Wulaga quarry, China. A. GMH W103, right ilium in lateral (A1) and medial (A2) views. B. GMH W400−2, right ischium in lateral view. C. GMH W179, left pubis in lateral (C1) and medial (C2) views.

Fig. 9 in New hadrosaurid dinosaurs from the uppermost Cretaceous of northeastern China

Fig. 9. The hadrosaurid dinosaur Sahaliyania elunchunorum gen. et sp. nov. from the Upper Cretaceous Yuliangze Formation at the Wulaga quarry, China. A. GMH W201, right humerus in caudal (A1) and cranial (A2) views. B. Relative growth of the width of the deltopectoral crest (y) and of the length of the humerus (x) in lambeosaurine dinosaurs.

Fig. 6 in New hadrosaurid dinosaurs from the uppermost Cretaceous of northeastern China

Fig. 6. The hadrosaurid dinosaur Sahaliyania elunchunorum gen. et sp. nov. from the Upper Cretaceous Yuliangze Formation at the Wulaga quarry, China. A. GMH W451, left dentary in medial (A1) and lateral (A2) views. B. GMH W153, right dentary in medial (B1) and lateral (B2) views, and detail of dentary teeth (B3).

Fig. 3 in New hadrosaurid dinosaurs from the uppermost Cretaceous of northeastern China

Fig. 3. The hadrosaurid dinosaur Sahaliyania elunchunorum gen. et sp. nov. holotype GMH W453 from the Upper Cretaceous Yuliangze Formation at the Wulaga quarry, China. Braincase in caudal (A, B) and right lateral (C, D) views. Dotted lines indicate hypothetical sutures. Photographs (A, C) and explanatory drawings (B, D).

Fig. 13 in New hadrosaurid dinosaurs from the uppermost Cretaceous of northeastern China

Fig. 13. The hadrosaurid dinosaur Wulagasaurus dongi gen. et sp. nov. from the Upper Cretaceous Yuliangze Formation at the Wulaga quarry, China. GMH WJ1, braincase in dorsal (A, B) and caudal (C, D) views. Photographs (A, C) and explanatory drawings (B, D).

Fig. 1. A in New hadrosaurid dinosaurs from the uppermost Cretaceous of northeastern China

Fig. 1. A. Location of the Amur/Heilongjiang Region in Asia. B. A sketch map of the Amur/Heilongjiang Region (modified from Kirillova 2003). The main dinosaur sites are indicated by solid triangles.

Fig. 17 in New hadrosaurid dinosaurs from the uppermost Cretaceous of northeastern China

Fig. 17. The hadrosaurid dinosaur Wulagasaurus dongi gen et sp. nov. from the Upper Cretaceous Yuliangze Formation at the Wulaga quarry, China. A. GMH W320, right humerus in medial (A1), cranial (A2), lateral (A3), and caudal (A4) views. B. GMH W398−A,?left ischium in?lateral view.