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45 results for “Heterodontosaurus”
Fig. 5 in Enamel microstructure and dental histology in a heterodontosaurid dinosaur: Heterodontosaurus tucki
Fig. 5. Simplified ornithischian phylogeny depicting characteristic schmelzmusters and enamel types for studied clades. Note: Presence of enamel tubules in Heterodontosaurus tucki dentary teeth remains unknown. Modified from Hwang (2005).
Fig. 3 in Enamel microstructure and dental histology in a heterodontosaurid dinosaur: Heterodontosaurus tucki
Fig. 3. Enamel microstructure of heterodontosaurid dinosaur Heterodontosaurus tucki Crompton and Charig, 1962 (BP/1/9007), from Lower Jurassic upper Elliot Massospondylus Assemblage Zone of South Africa. A. Scanning electron micrographs: A1, simplified, thin, labial edge enamel with incremental lines in transverse view; A2, thick, mesio-distal edge enamel exhibiting poorly organized crystallites and extremely infrequent enamel tubules in transverse view; A3, mesio-distal edge enamel exhibiting three enamel layers in longitudinal view. Long, sinuous, and continuous enamel tubules are frequently observed in this sectioning plane. B. Schematic enamel block depicting how enamel crystallite complexity might differ in different planes of sectioning. Abbreviations: BUL, basal unit layer; CUL, columnar unit layer; EDJ, enamel dentine junction; OES, outer enamel surface; PC, parallel crystallite.
Fig. 2 in Enamel microstructure and dental histology in a heterodontosaurid dinosaur: Heterodontosaurus tucki
Fig. 2. Maxillary tooth histology of heterodontosaurid dinosaur Heterodontosaurus tucki Crompton and Charig, 1962 (BP/1/9007), from Lower Jurassic upper Elliot Massospondylus Assemblage Zone of South Africa. A. Histological sections: A1, primary ridge: thick band of translucent dentine lines the labial edge of the tooth, no enamel is present; A2, whole tooth: transversely sectioned at the base of the wear facet; A3, mesial ridge: histologically distinct dentine thickens and enamel is absent; A4, labial edge: on the mesial distal edges the enamel is extremely thin, resulting from wear and likely a natural thinning of the enamel, histologically distinct dentine is present, but thin; A5, lateral edge: the enamel is thickest with no distinct dentine present. B. Scanning electron micrograph of labial edge of tooth showing crest formation from differential wear from the last stage of polishing.
Fig. 4 in Enamel microstructure and dental histology in a heterodontosaurid dinosaur: Heterodontosaurus tucki
Fig. 4. Scanning electron micrographs depicting histologically distinct dentine on the outer labial edge of maxillary teeth of heterodontosaurid dinosaur Heterodontosaurus tucki Crompton and Charig, 1962 (BP/1/9007), from Lower Jurassic upper Elliot Massospondylus Assemblage Zone of South Africa. A1, shows the change in dentinal tubule orientation from radially emanating (below black dashed line) to longitudinally emanating (above black dashed line, circular cross-sections) to the atubular dentine present on the outermost edge (above white dashed line). Inset shows the position of the micrograph on the tooth cross section. A2, depicts the marked decrease in dentinal tubules in the outer ~20 µm of dentine. Inset shows that only intertubular dentine is present and the absence of occluded tubules which would be expected if this was derived from sclerotization of the dentine. A3, high magnification image of open dentinal tubules in the histologically distinct enamel (above black dashed line in A1). A4, close up showing the transition zone of tubule orientation. White arrow shows tubule cut along its long axis; black arrows show orthogonally sectioned tubules (circular). More circular tubules are present above the black dashed line than below indicating the zone of tubule orientation shift.
Fig. 1 in Enamel microstructure and dental histology in a heterodontosaurid dinosaur: Heterodontosaurus tucki
Fig. 1. Heterodontosaurid dinosaur Heterodontosaurus tucki Crompton and Charig, 1962 (BP/1/9007), from Lower Jurassic upper Elliot Massospondylus Assemblage Zone of South Africa. Left partial maxillary tooth row in lingual view; preserves partial crowns with wear facets. Blue plane indicates location of histological transverse sections from the middle of the tooth row.
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.
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