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FIGURE 2 in Cranial anatomy of tadpoles of five species of Scinax (Hylidae, Hylinae)

FIGURE 2. Scanning electron photomicrographs (SEM) of the oral discs of Scinax species. (A) S. uruguayus stage 37, frontal view showing lower jaw sheath, lower labial tooth rows, and widely-spaced mental marginal papillae; (B) S. aromothyella stage 31, detail of multicusped labial teeth; (C) S. acuminatus stage 39, detail of the lower labial tooth rows and mental gap; (D) S. acuminatus stage 39, detail of upper labial tooth with cusps reduced or absent. Bars (A, C) = 0.25 mm and (B, D) = 0.05 mm.

FIGURE 7 in Cranial anatomy of tadpoles of five species of Scinax (Hylidae, Hylinae)

FIGURE 7. Larval neurocrania and palatoquadrates (dorsal view, left), cartilago suprarostralis (frontal view, right top), and lower jaw cartilages (dorsal view, right bottom) of Scinax species. (A) S. uruguayus stage 36; (B) S. aff. pinima stage 35; (C) S. acuminatus stage 36; (D) S. aromothyella stage 29; and (E) S. berthae stage 38. References: as, arcus subocularis; ca, capsula auditiva; ci, cartilago infrarostralis; cm, cartilago meckeli; cqa, commissura quadratocranialis anterior; ct, cornu trabeculae; fcp, foramen caroticum primarium; ff, fenestra frontoparietalis; lpo, larval processus oticus; pa, pars alaris; par, processus articularis; pas, processus ascendens; pc, pars corporis; pdm, processus dorsomedialis; pif, pituitary fenestra; pmq, processus muscularis; ppd, processus posterior dorsalis; pq, processus quadratoethmoidalis; pra, processus retroarticularis; pvm, processus ventromedialis; tma, taenia tecti marginalis; tp, tectum parietale; ts, tectum synoticum; ttm, taenia tecti medialis. Bar = 1 mm.

FIGURE 6 in Cranial anatomy of tadpoles of five species of Scinax (Hylidae, Hylinae)

FIGURE 6. SEM photomicrographs of the buccal roofs of Scinax species. (A) S. uruguayus stage 37; (B) S. aff. pinima stage 37; (C) S. acuminatus stage 39; (D) S. aromothyella stage 31; (E) S. berthae stage 38; (F) S. berthae (from Uruguay) stage 36, detail of the anterior region of the buccal roof. References: ch, choana; dv, dorsal velum; gz, glandular zone; lrop, lateral roof papillae; lrp, lateral ridge papillae; mr, median ridge; nr, narial ridge; pnap, prenarial arena papilla; ptnp, postnarial papillae. Bar = 1 mm.

FIGURE 9 in Cranial anatomy of tadpoles of five species of Scinax (Hylidae, Hylinae)

FIGURE 9. Cranial muscles of Scinax uruguayus stage 35. (A) Dorsal and (B) ventral views. References: cbII–IV, constrictor branchialis II–IV; cl, constrictor laryngis; db, diaphragmatobranchialis; dl, dilatator laryngis; gh, geniohyoideus; ha, hyoangularis; ih, interhyoideus; im, intermandibularis; labI–IV, levator arcuum branchialium I–IV; lma, levator mandibulae articularis; lmep, levator mandibulae externus profundus; lmes, levator mandibulae externus superficialis; lmi, levator mandibulae internus; lml, levator mandibulae lateralis; lmlp, levator mandibulae longus profundus; lmls, levator mandibulae longus superficialis; ml, mandibulolabialis; oh, orbitohyoideus; qa, quadratoangularis; rc, rectus cervicis; sa, suspensorioangularis; sh, suspensoriohyoideus; so, subarcualis obliquus; srI–IV, subarcualis rectus I–IV; tp, tympanopharyngeus. Bar = 1 mm.

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.

Figure 18 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 18. Heterodontosaurus tucki Crompton & Charig, 1962. SAM-PK-K1332 (referred specimen). Right lower jaw (anterior portion only) in (A) lateral and (B) medial views, see also Appendix 5C,D. For full list of abbreviations see end of paper.

Figure 13 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 13. Heterodontosaurus tucki Crompton & Charig, 1962. Attempted reconstruction of the skull in ventral view (lower jaw removed). Note: the anatomical configuration of the anterior palate is conjectural; the proximity of the medial edges of the pterygoids is uncertain, although they seem unlikely to have been sutured in place, but may have been closer together than shown here, and linked by connective tissue, in life; the thin vertical sheets of bone that form the medial wall of the adductor chamber (pterygoid and quadrate wings, and the much-expanded flange on the lateral surface of the basisphenoid) appear to have been quite close. For full list of abbreviations see end of paper.

Figure 15 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 15. Heterodontosaurus tucki Crompton & Charig, 1962. A, reconstruction of the neurocranium in left lateral view (with surrounding bones indicated as transparent). B, outline based on (A) above with annotations to identify specific structural features. Reconstruction based on the skulls of SAM-PK-K337 and K1332 supplemented by stereo photographs prepared for A. W. C. in anticipation of the earlier planned publication. Notes: the suture between the lateral walls of the braincase and the floor is unclear; the sutures between the laterosphenoid, proötic and opisthotic are not discernible; the extent of the dorsal lappet that appears to project from the dorsomedial edge of the?proötic is uncertain (it remains a possibility that the 'lappet' represents an anterior extension of the supraoccipital); the details of the anatomy of the basisphenoid flange in the proximity of the trigeminal fossa are unclear – even in the original stereo pairs prepared for A. W. C. For full list of abbreviations see end of paper.

Figure 12 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 12. Heterodontosaurus tucki Crompton & Charig, 1962. Attempted reconstruction of the skull in dorsal view. For full list of abbreviations see end of paper.

Figure 16 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 16. Heterodontosaurus tucki Crompton & Charig, 1962. SAM-PK-K1332 (referred specimen). Left lower jaw in (A) lateral view (B) annotated outline drawing (see Appendix 6A). For full list of abbreviations see end of paper.

Figure 17 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 17. Heterodontosaurus tucki Crompton & Charig, 1962. SAM-PK-K1332 (referred specimen). Left lower jaw in (A) medial view (B) annotated outline drawing, see also Appendix 6B. For full list of abbreviations see end of paper.

Figure 36 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 36. Heterodontosaurus. Attempted reconstruction of some of the principal adductor musculature. M. pterygoideus posterior (MPTP) showing its presumed origin on the pterygoid and pterygoid flange.?M. pterygoideus anterior (MPTA) shown as a slip associated with the MPTP and inserting on the posteromedial surface of the prearticular. Deeper shading indicates the supposed shared origin of the two muscle masses on the pterygoid.

Figure 10 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 10. Heterodontosaurus tucki Crompton & Charig, 1962. Attempted reconstruction of the skull in left lateral view with the bones of the snout sectioned along a sagittal plane. The left suspensorial elements have been removed to reveal the anatomy of the braincase elements and palate bones. Note: contrary to appearance the left basipterygoid process (lbpt) is not in articulation with the right basal articulation (rba). For full list of abbreviations see end of paper.

Figure 11 in The Lower Jurassic ornithischian dinosaur Heterodontosaurus tucki Crompton & Charig, 1962: cranial anatomy, functional morphology, taxonomy, and relationships

Figure 11. Heterodontosaurus tucki Crompton & Charig, 1962. Attempted reconstruction of the skull and the articulated right lower jaw in left lateral view, revealed following sagittal sectioning and removal of the right vomer. Note: the contours of the floor of the braincase and its internal walls are conjectural; the thickness and anterior extent of the supraoccipital are unknown and have been illustrated very conservatively; the anatomy of the contacts between the vomer, palatine, pterygoid and maxilla in the anterior-central part of the snout are conjectural. For full list of abbreviations see end of paper.