Witmer, L. M., and R. C. Ridgely. 2008. The paranasal air sinuses of ...
Witmer, L. M., and R. C. Ridgely. 2008. The paranasal air sinuses of ...
Witmer, L. M., and R. C. Ridgely. 2008. The paranasal air sinuses of ...
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DINOSAUR PARANASAL AIR SINUSES<br />
1373<br />
Figure 5.<br />
(continued)<br />
abundant evidence that the antorbital cavity <strong>of</strong> extinct<br />
archosaurs was causally linked to the presence <strong>of</strong> the<br />
antorbital <strong>paranasal</strong> <strong>air</strong> sinus, just as in extant archosaurs,<br />
<strong>and</strong> some <strong>of</strong> the strongest evidence comes from<br />
theropods where there are numerous examples <strong>of</strong> accessory<br />
cavities that open directly into the antorbital cavity<br />
(<strong>Witmer</strong>, 1997a). <strong>The</strong>se accessory cavities have the same<br />
smooth-walled, strutted appearance <strong>of</strong> pneumatic cav-
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