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213 results for “Ornithopoda”
FIGURE 9 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 9. Medial skull schematic (above), right skull photograph (middle), and right skull schematic (below) of OMNH 58340. Parts of the vomer, frontal, parietal, laterosphenoid, squamosal, supraoccipital, exoccipital/opisthotic, and prootic, as well as the entirety of the right quadrate, quadratojugal, and jugal, have been removed from the medial skull schematic in order to show the structure of the braincase and its orientation with the rest of the skull. The broken texture in gray in the upper schematic indicates the sectioning of elements necessary to view the endocranium. The skull is angled at the 'alert position' indicated by the horizontal semicircular canal. Natural fenestrae are shaded gray. Anterior is to the right. Abbreviations: ap - alveolar parapet; s - sulcus.
FIGURE 14 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 14. Dorsal view of the elements of the virtual palate of OMNH 58340, including the palatine, maxilla, pterygoid, and ectopterygoid, as well as the jugal, detailing the means of articulation between the various elements. Anterior is to the right.
FIGURE 10 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 10. Medial view of the left side of the virtual skull of OMNH 58340 with the vomer present (10.1), allowing a view of the articulation of the vomer with the pterygoid, and with the palatine and vomer removed (10.2), allowing a view of the joints between the maxilla, lacrimal, prefrontal, jugal, ectopterygoid, and pterygoid. The vertically striated texture present on the visible surfaces of many elements, notably the lacrimal, maxilla, and premaxilla, is an artifact of the process used to isolate CT images of each element from the remainder of the data set. Abbreviations: f - flange; pp - posterior processes; tp - triangular processes.
FIGURE 19 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 19. Medial view of the virtual left premaxilla, nasal, lacrimal, and maxilla of OMNH 58340 showing the nasal arch of the nasal just below its articulation with the nasal process of the premaxilla. Anterior is to the right. Abbreviation: na - nasal arch.
FIGURE 3 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 3. Photograph of the lateral side of the disarticulated right maxilla and other associated elements of OMNH 58340. The exclusion of the maxilla from contact with the nasal is apparent, although there is some separation, probably taphonomic, of the premaxilla and lacrimal. Dotted line indicates uncertain sutural placement between the nasal and maxilla.
FIGURE 2 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 2. Left lateral skull schematic (above) and left skull photograph (below) of OMNH 58340. The skull is angled at the 'alert position' indicated by the horizontal semicircular canal. Natural fenestrae are shaded gray. Dashed outline denotes conjectural sclerotic ring. Anterior is to the left. Abbreviation: mf - maxillary foramen.
FIGURE 1 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 1. Posterior skull schematic (above) and photograph (below) of OMNH 58340. The schematic was reconstructed by digitally mirroring the left side of the suspensorium in order to approximate the actual appearance of the skull. The two images are set to the same scale, demonstrating the amount of displacement in the right side. Anterior is into the page. Abbreviations: bp - basipterygoid process; fm - foramen magnum; ptf - posterior temporal foramen (obscured); sb - squamosal boss.
FIGURE 17 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 17. Anteromediodorsal view of the virtual skull of OMNH 58340, showing the features surrounding the maxillary groove of the maxilla, including the dental ridge and the possibility of a soft-tissue roof covering it in life. Abbreviations: dr - dental ridge of the maxilla; la - lamina of the maxilla; mf - medial flange of the lacrimal; mg - maxillary groove; mp - maxillary projection.
FIGURE 27 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 27. Photograph of the prefrontal fossa (indicated by arrows) of the right frontal of OMNH 58340. The pyramidal corner of the disarticulated prefrontal fits into this fossa. Anterior is to the right and out of the page.
FIGURE 12 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 12. Coronal CT image, taken at the level of the posterior termination of the antorbital fenestra, of the paired posterior processes of the vomer of OMNH 58340. This image shows the disarticulated nature of the two halves of the posterior part of the element, as well as their shape just anterior to the opening of the orbit, between the paired palatines. Faint green lines are an artifact of the program used to define the element on each image. Anterior is into the page.
FIGURE 16 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 16. Lateral view (16.1) of the virtual ectopterygoid (green) and pterygoid (yellow) of OMNH 58340. Dorsal view (16.2) of the virtual pterygoid only. Anterior is to the left. Abbreviations: ep - ectopterygoid process; lf - lateral fossa; pf - pterygoid flange; pp - palatine process; mp - medial process; qp - quadratic process.
FIGURE 11 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 11. Photographs of the medial aspect of the vomer (foreground) and dental ridge of the maxilla (background, just below matrix) of OMNH 58340 (11.1) and showing the fine grain on the dorsal surface of the maxilla (11.2). Single headed arrow indicates the median ridge of the vomer. Double headed arrows indicate the paired sharp ridges of the same element. The area figured in 11.2 is indicated by the shaded area in 11.1. Anterior is to the right.
FIGURE 23 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 23. Labial photograph of the left maxillary dentition (23.1) and lingual photograph of the left dentary dentition (23.2) of OMNH 58340. Note the finely ornamented surface of the alveolar parapet of the dentary between the lower exposed surfaces of the teeth and the dorsally arched sulcus.
FIGURE 15 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 15. Posterolaterodorsal view of the left orbit of the virtual skull of OMNH 58340, presenting a view of the joint between the prefrontal, lacrimal, jugal, and palatine. The parallel contour lines on the posterior surfaces of the parietal, prefrontal, quadrate, and squamosal, are an artifact of the CT scanning process, and represent the faces of individual slice images. These lines occur on any surface angled near parallel with the scanner. Anterior is into the page, toward the top left. Abbreviation: lt - lateral tubercle; pg - pterygoid groove.
FIGURE 26 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 26. Photograph of the left prefrontal, frontal, and postorbital of OMNH 58340, showing the high degree of rugosity above the orbit. Anterior is to the left.
FIGURE 22 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 22. Coronal CT image of the left maxilla (pink) of OMNH 58340, taken midway along the axial length of the element, showing its facial lamina (left) and dental ridge (right, surrounding two teeth, lighter, due to higher density). Faint green lines are an artifact of the program used to define the element on each image. Abbreviations: a - alveolus; c - canal; lg - lamellar gap.
FIGURE 21 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 21. Ventral view of the skull roof of OMNH 58340. The palate and the lateral facial elements have been removed to allow for the viewing of the associations of the elements depicted. Location of endocast indicated by black outline. Note the nasal and prefrontal ending at nearly the same point posteriorly. Anterior is to the right. Abbreviations: la - area of articulation with capitate process of laterosphenoid; pp - pedicles of partietal; ar - arcuate ridge; sa - area of articulation with supraoccipital.
FIGURE 25 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 25. Ventral (25.1) and medial (25.2) photographs of the disarticulated right prefrontal of OMNH 58340. Anterior is left. Arrows indicate undulating texture on the ventral and medial surfaces of the element, which indicate the area of articulation with the frontal. The space between two broken ends of the ventral process in 25.2 is indicated by a dashed gray line. Abbreviation: vp - ventral process.
FIGURE 5 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 5. Dorsal skull schematic (above) and photograph (below) of OMNH 58340. The schematic was reconstructed by digitally mirroring the left side of the rostrum and suspensorium in order to approximate the actual appearance of the skull. Dotted line at the anterior edge of the frontals indicates uncertain sutural placement. Natural fenestrae are shaded gray. Anterior is to the right.
FIGURE 30 in The cranial anatomy of Tenontosaurus tilletti Ostrom, 1970 (Dinosauria, Ornithopoda)
FIGURE 30. Lateral view of the virtual left squamosal of OMNH 58340 showing the deep articular fossae and the processes of the element. Anterior is to the left. Abbreviations: ap - anterior process; ah - articulation for head of quadrate; apo - articulation for postorbital; poq - postquadratic process; preq - prequadratic process.
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