. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 22 ANNALS OF THE SOUTH AFRICAN MUSEUM Upper cheek teeth (Table 2; Figs 2, 4, 5) The upper dentition of the Skurwerug cranium is remarkable not only in having the incisors reduced in number (to two pairs) but also in having the premolars reduced both in size and in number (to three upper and two lower pairs). The Peninj cranium has the upper premolars reduced to only two pairs, but they are relatively enlarged rather than reduced. PQ2166 shows no sign of P\ nor of any scar to indicate that it was ever
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. 22 ANNALS OF THE SOUTH AFRICAN MUSEUM Upper cheek teeth (Table 2; Figs 2, 4, 5) The upper dentition of the Skurwerug cranium is remarkable not only in having the incisors reduced in number (to two pairs) but also in having the premolars reduced both in size and in number (to three upper and two lower pairs). The Peninj cranium has the upper premolars reduced to only two pairs, but they are relatively enlarged rather than reduced. PQ2166 shows no sign of P\ nor of any scar to indicate that it was ever present. In K. limnetes P^ was present in the rare female specimen KNM-ER1085 (although only the socket remains) and in the Olduvai Bed I palate FLK W626, so its retention may well have been a normal feature in the 'typical' female. Although it is lacking in many of the male specimens, it is certainly present in some cases. At Olduvai it occurs in a crushed male skull FLK NN I 177, lying 0,5 cm in front of P^ as in the female skull mentioned above; at Koobi Fora it was present in the male skull KNM-ER212, lying in contact with P^; and in the Shungura Formation was present in the male cranium L193-109 from Member C8, lying 2,5 cm in front of P^. Fig. 4. Occlusal view of the left upper cheek teeth of the Kolpochoerus paiceae skull from Skurwerug (SAM-PQ2166). Natural size. The P2 of PQ2166, which is preserved on the left side only, has the exposed parts of its two roots fused. The normal P^ has three cusps, one behind the other, with the central cusp the largest. In PQ2166 there are only two cusps, well fused and worn so that the dentine areas almost merge. The anterior cusp is longer than the posterior one and tapers anteriorly, giving it a triangular outline in occlusal view. It somewhat resembles the P^ of other specimens although the true P^ is single-rooted. The right P^ is intact, that on the left slightly damaged, and both are well worn. The tooth is triangular in occlusa
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
