Witmer, L. M., R. C. Ridgely, D. L. Dufeau, and M. C.

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Fig. 6.2. Diagram of the phylogenetic relationships of the principal taxa discussed in the text. From left, the extant crocodilian Crocodylus johnstoni (OUVC 10425), the diplodocoid sauropod Diplodocus longus (CM 11161), the macronarian sauropod Camarasaurus lentus (CM 11338), the basal coelurosaurian theropod Tyrannosaurus rex (AMNH 5117), and the avian theropod (bird) Bubo virginianus (OUVC 10220). These sauropods and theropods are saurischian dinosaurs. The images are surface renderings of CT scan data. Bony skulls are depicted as transparent, revealing such internal structures as the brain cast, labyrinth, and pneumatic sinuses. All skulls are oriented in their ‘alert’ postures, determined by orienting the skull such that the lateral semicircular canal is horizontal. Scale bars equal 10 cm, except that for B. virginianus which equals 2 cm.
Fig. 6.3. Cranial endocast, endosseous labyrinth, and some endocranial vascular structures of an Australian freshwater crocodile, Crocodylus johnstoni (OUVC 10425), derived from surface renderings of CT scan data. A, left lateral view. B, dorsal view, with olfactory tract truncated. C, ventral view, with olfactory tract truncated. D, caudal view. E, right rostroventrolateral view. Color scheme: cranial endocast, blue; endosseous labyrinth, pink; nerve canals (most of which also transmit veins), yellow; smaller venous canals, dark blue; arterial canals, red; columella, pale yellow. Scale bars equal 1 cm.
Page 2 and 3: 6 Using CT to Peer into the Past: 3
Page 4 and 5: New York; ANSP, Academy of Natural
Page 6 and 7: 6.4 Results As noted earlier, we wi
Page 8 and 9: the tympanic branches of the glosso
Page 10 and 11: Fig. 6.7. Cranial endocast, endosse
Page 14 and 15: foramina for Barosaurus, but regard
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Page 18 and 19: apply to sauropods, and in fact, th
Page 20 and 21: Pittsburgh) for loan of Camarasauru
Page 22 and 23: Norberg RA (1978) Skull asymmetry,
Page 26 and 27: Fig. 6.6. Pneumatic sinuses of the
Page 30 and 31: Fig. 6.10. Cranial endocast, endoss
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Witmer, L. M., R. C. Ridgely, D. L. Dufeau, and M. C.

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