174


Journal of Paleontology 90(1):170–181


Figure 5. Stereophotographs of a left lateral view of the cranium of Nabotherium aegyptiacum (CGM 67200) from Fayum Quarry V, Jebel Qatrani Formation.


for the first upper incisors and left canine (Fig. 6). The left tooth row is also slightly displaced anteriorly when compared with the right tooth row. The occlusal morphology of the teeth is clear even though minor cracks are visible on the posterior molars. The upper cheek teeth have bunodont crowns, with rounded cusps. The size of the teeth increases from P1 to M3. Upper incisors: I2 is relatively short and shows a crown that


Upper dentition: The upper dentition is preserved, except


is labiolingually compressed, with a convex labial surface and concave lingual surface. The I2 mesial and distal crests are sharp and meet at the midpoint of the crown, forming the tip of the tooth. Wear is present on the mesial crest only. The I3 is narrow and caniniform compared with I2. The mesial and distal crests are less sharp than on I2, and an appreciable wear facet is visible


on the distal crista. The diastema between I2 and I3 is slightly longer than the one between I1 and I2. Upper canines: The upper canine is very large, oval in cross


section, being the tallest tooth in the upper dentition, and it has a sharp and pointed tip. The tooth is slightly labiolingually compressed with a deep root that is ~2.5 times bigger than the size of the crown. The mesial part of the tooth is not preserved but the distal edge is well developed. There is a very short diastema between the C and I3. Upper premolars: The upper first premolar is relatively


small and has two roots. The tooth is peg-like, labiolingually compressed, and triangular in lateral view, being longer than wide and broader distally than mesially. The mesial crest is weakly developed and the distal crest is highly abraded.


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