The Australopithecine Face by Yoel Rak

By Yoel Rak

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In A. afiicanus, on the other hand, the maximum distance between the bone tables is not as great, reaching only 10 mm (the mean of four specimens: STS-5, STS-17, STS-53, and TM-1512). As noted above, the palate of at least one A afiicanus individual, MLD-9 (Plate 7C), shows more of a resemblance to that of A. robustus in many respects, and this includes the midsagittal cross section. The same is probably also true for the palate of MLD-6. The lingual aspect of the more posterior part of the alveolar processes in A.

Africanus, and, indeed, the range of the 12 chimpanzees does not encompass the value of STS-5 and certainly not of STS-71, as indicated in Table 3. 3. Similarly, the position of the masseter can be examined in reference to an independent point (not in reference to the palate, as above). 25 Lateral View TABLE 3: Indices Expressing Relationships within the Masticatory System in Chimpanzee, Gorilla, A. africanus, A. robustus, and A. boisei. D. D. 2 A. 2 A. 3 A. 6 "Based on reconstructions. In order to determine how far the masseter extends anteriorly, the distance between the articular eminence and the zygomatic tubercle is expressed as a percentage of the distance from the articular eminence to sellion (Plate 33C).

The same is probably also true for the palate of MLD-6. The lingual aspect of the more posterior part of the alveolar processes in A. robustus is vertical and merges abruptly into the roof of the palate, as in A. afiicanus. This pattern extends toward the most anterior part of the palate, although the height of the processes gradually decreases as the palate becomes more shallow anteriorly. The palate assumes the shape of a channel with vertical walls that are more or less parallel. A. robustus resembles A.

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