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Figure 15 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 15. Fused sacral vertebrae of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in left lateral (A) and dorsal (B) views. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Hatched areas represent incomplete bone surface. White areas represent plaster reconstruction.

Figure 13 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 13. Dorsal vertebral series of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in dorsal (A) and left lateral (B) views. Anterior vertebrae show the dissociation of neural arches and centra. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Dashed lines indicate extrapolated margins of the element. Hatched areas represent incomplete bone surface. White areas represent plaster reconstruction.

Figure 11 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 11. Braincase of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in anterior (A), posterior (B), internal ventral (C), internal dorsal (D), ventral (E), dorsal (F), and left lateral (G) views. See list in text for an explanation of anatomical abbreviations. Dashed lines indicate extrapolated margins of the element. Hatched areas represent incomplete bone surface. White areas represent plaster reconstruction. Roman numerals denote cranial nerve foramina.

Figure 7 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 7. Left jugal of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in right (A) and left (B) lateral views. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Dashed lines indicate extrapolated margins of the element.

Figure 12 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 12. Left quadrate of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in medial (A), anterior (B), posterior (C), and lateral (D) views. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Dashed lines indicate extrapolated margins of the element. Hatched areas represent incomplete bone surface.

Figure 10 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 10. Right dentary of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in medial (A), dorsal (B), lateral (C), and ventral (D) views. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Hatched areas represent incomplete bone surface.

Figure 2 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 2. Chronostratigraphy of the Late Cretaceous of Alberta, Saskatchewan, and Montana, Wyoming, and North and South Dakota, showing approximate time equivalence. Numbers on the left are in millions of years before present. Formations in white are terrestrial, and those in grey are marine; DMT, Drumheller Marine Tongue. Complied from Eberth, 2004; Brinkman DB. 2003; Koppelhus EB, Braman DR. 2010; Hamblin and Abrahamson, 1996; McIver 2002.

Figure 6 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 6. Left squamosal of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in dorsal (A), ventral (B), medial (C), and lateral (D) views. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Dashed lines indicate extrapolated margins of the element. Hatched areas represent incomplete bone surface. White areas represent plaster reconstruction.

Figure 5 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 5. Left palpebral of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in ventral (A), dorsal (B), lateral (C), and medial (D) views. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Dashed lines indicate extrapolated margins of the element.

Figure 4 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 4. The skull roof of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in dorsal (A) and ventral (B) views. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Dashed lines indicate extrapolated margins of the element. Hatched areas represent incomplete bone surface. White area represents plaster reconstruction.

Figure 1 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 1. Diagrams of the skeletons of relatively complete articulated Thescelosaurus specimens (A–I) and Parksosaurus (J), showing their comparative size and degree of completeness. Bones present in each specimen are represented in white. A, LACM 33542; B, SDSM 7210; C, MOR 979; D, NCSM 15728; E, USNM 7757; F, USNM 7758; G, CMN 8537; H, LACM 33543; I, RSM P 1225.1; J, ROM 804. Skeletons are scaled isometrically based on femur and tibia length, when available. Skeletons lacking both tibiae and femora were scaled using the following elements: anteroposterior thickness of orbit for SDSM 7210; length of the dentary for LACM 33543; and length of the humerus for USNM 7758. Proportions for specimens of Thescelosaurus represent those of USNM 7757, and do not illustrate proportional changes that would be evident because of allometric scaling. Scale equals 1 m. Modified from Boyd et al. 2009.

Figure 8 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 8. Right pterygoid of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, in medial (A), lateral (B), dorsal (C), and ventral (D) views. See list in text for an explanation of anatomical abbreviations. Primes indicate illustrations of photographed elements. Dashed lines indicate extrapolated margins of the element. Hatched areas represent incomplete bone surface.

Figure 9 in A new basal ornithopod dinosaur (Frenchman Formation, Saskatchewan, Canada), and implications for late Maastrichtian ornithischian diversity in North America

Figure 9. Palatines of the holotype of Thescelosaurus assiniboiensis sp. nov., RSM P 1225.1, left palatine in (A) dorsal and (B) ventral view; right palatine in (C) dorsal and (D) ventral view. Primes indicate illustrations of photographed elements. Dashed lines indicate extrapolated margins of the element. Hatched areas represent incomplete bone surface.

Figure 35 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 35. Heterodontosaurus. Attempted reconstruction of some of the principal adductor musculature. A, M. adductor mandibulae externus posterior (MAMEP) attaching to a presumed bodenaponeurosis on the apex of the coronoid bone; M. adductor mandibulae posterior (MAMP) restored in its most probable position. B, M. pseudotemporalis (MPS) shown inserting on the presumed coronoid bodenaponeurosis. M. pterygoideus posterior (MPTP) originating on the posteroventral surface of the pterygoid, and shown inserting on the lateral surface of the surangular beneath the jaw joint. Dark shading represents visible musculature, light shading indicates the path taken by muscle covered by superficial bones.

Figure 39. A in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 39. A, Abrictosaurus consors (Thulborn, 1974). NHMUK RU B54 (holotype). A partial skull (illustrated in abstract form – and based on the reconstruction in Thulborn, 1978). Shading represents known elements of the skull and dentition. The specimen includes postcranial elements that (along with the skull) are in need of further preparation and re-description. B, Abrictosaurus consors (Thulborn, 1974). NHMUK RU B54 (holotype). The maxillary and dentary dentitions, as drawn by Thulborn (1974: fig. 3). C, Lanasaurus scalpridens Gow, 1975. BP/1/4244 (holotype). The maxillary dentition in medial aspect [reversed for comparison with (B)] showing the almost complete dentition (crown 12 obliquely truncated) and with the individually angled wear facets accentuated by cross-hatching (redrawn from Hopson, 1980: fig. 2).

Figure 31 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 31. Heterodontosaurus tucki. SAM-PK-K1334 (referred specimen). Posterior portion of the left maxilla. Segmented image prepared from computed tomography scans of the original. A, medial aspect. Bones in grey, erupted crowns shown in yellow, replacement crowns shown in red. B, semi-transparent image to show the position and extent of erupted and replacement teeth within the maxilla. For full list of abbreviations see end of paper.

Figure 24 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 24. Heterodontosaurus tucki Crompton & Charig, 1962. SAM-PK-K1332 (referred specimen). The upper dentition in: A, occlusal view based on original specimen as preserved; B, partial reconstruction of the lateral view of the maxillary dentition alone, with the isolated M.1 added in position; C, reconstruction of the medial view of M.1– M.3. For full list of abbreviations see end of paper.

Figure 27 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 27. Heterodontosaurus tucki Crompton & Charig, 1962. SAM-PK-K1332 (referred specimen). Line drawings based on scanning electron micrograph images of right dentary teeth: De.7–De.9. A, worn surfaces of the teeth in oblique dorsolateral aspect showing the lipped lower edges of the wear facets and the minor imbrication between crowns (the overlap pattern is the reverse of that seen in the maxillary dentition – see Fig. 21B). B, close-up of De.9 to show details of the wear facet and the lower 'lip' at the base of the wear facet. For full list of abbreviations see end of paper.

Figure 19 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 19. Heterodontosaurus tucki Crompton & Charig, 1962. Attempted reconstruction of the left lower jaw in (A) lateral view and (B) medial view. For full list of abbreviations see end of paper.

Figure 34 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 34. Heterodontosaurus. Attempted reconstruction of some of the principal adductor musculature. A, M. adductor mandibulae externus superficialis (MAMES) showing a subdivision into portions associated primarily with the postorbital and squamosal (MAMESX in the text), respectively. B, M. depressor mandibulae (MDM). Dark shading represents visible musculature, light shading indicates the path taken by muscle covered by superficial bones.