FIGURE 4.

PCD-CT and 3D imaging algorithms of the right bony meatal chamber (A) and (B) skin with superior (sf) and inferior (if) earflaps in the living C. rhombifer. Inset shows ear canal air segmentation. Position of serial frontal sections are shown in bony and soft tissue algorithms and are displayed in Figure 6A. At area f-h, corresponding to the area of the subtympanic foramen, the sf bulges somewhat outwards. (C) A recently expired Cuban crocodile of similar size and age before aldehyde fixation. Its external ear canal is still somewhat open. Note the tympanic membrane-like texture at the posterior region of the superior earflap (white arrow). Its location corresponds to the location of the middle ear opening and extracolumella.