. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. KOLPOCHOERUS PAICEAE FROM SKURWERUG, SOUTH AFRICA 29. Fig. 8. Occlusal view of the right lower cheek teeth of the Kolpochoerus paiceae mandible from Skurwerug (SAM-PQ2166). Natural size. posterior one, and the anteriorly tapering part of the crown which it supports is correspondingly longer, but narrower, than the posterior section. A single elongated dentine island has been exposed by wear. In K. limnetes there is a stout main central cone Hnked to a well-developed posterior cingulum cone and to a w
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. KOLPOCHOERUS PAICEAE FROM SKURWERUG, SOUTH AFRICA 29. Fig. 8. Occlusal view of the right lower cheek teeth of the Kolpochoerus paiceae mandible from Skurwerug (SAM-PQ2166). Natural size. posterior one, and the anteriorly tapering part of the crown which it supports is correspondingly longer, but narrower, than the posterior section. A single elongated dentine island has been exposed by wear. In K. limnetes there is a stout main central cone Hnked to a well-developed posterior cingulum cone and to a weak anterior cingulum cusp. In PQ2166 the anterior cingulum cusp is lacking. The P4 of PQ2166 is a double-rooted tooth that is appreciably larger than P3. The P4 is well worn in both halves of the mandible, and the occlusal surfaces are taken up by figure-of-eight exposures of dentine, flanked anteriorly by a prominent cingulum. The characteristic offset of the double central cusp is apparent and the pattern is normal for Kolpochoerus limnetes, though the crown tapers a Httle anteriorly as compared with the usual rather rectangular crown. The reduction in size of P3 and P4 in comparison with the sample from Olduvai Bed I is clear from Figure 9. Both left and right Mi of PQ2166 are well worn, the only enamel remaining being on the lingual surfaces of these teeth. They evidently had paired cusps anteriorly and posteriorly, the latter being slightly the broader. The left and right M2 are also heavily worn, but sufficient enamel remains on the occlusal surface to show that the cusps consist of anterior and posterior pairs, separated by the two median cusps, and flanked by anterior and posterior cingula. The Ml and M2 are at the low end of the size range for the Olduvai Bed I sample but are otherwise unremarkable (Fig. 9). In the M3 of PQ2166, the trigonid and talonid are of similar size and, except for the anterior cingulum of the trigonid, they are nearly replicas of one another.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
