Abstract
ABSTRACT Diverticula of the tympanic pneumatic system were present lateral to the basicranium in Allosaurus, as evidenced by depressions on the basicranium and the presence of pneumatic foramina. An examination of an ontogenetic series of basicrania of A. fragilis shows this system to exhibit both ontogenetic and individual variation. Anteriorly, diverticula initially invade the basipterygoid process and withdraw with age (ontogenetic variation). Posteriorly, depressions for the diverticula are variably developed (individual variation). Although recesses on basipteryygoid processes are reported in several theropod families this condition is likely to be a parallelism.
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