禄丰古猿(Lufengpithecus lufengensis)牙齿釉质生长线与个体发育问题研究

INCREMENTAL MARKINGS OF ENAMEL AND ONTOGENY OF LUFENGPITHECUS LUFENGENSIS

运用扫描电子显微镜，对４枚禄丰古猿牙齿（恒齿）的釉质结构进行了观察研究。发现：禄丰古猿牙齿釉质表面有明显的釉面横纹结构；釉面横纹的密度向牙颈方向逐渐增大；观察记数了４枚牙齿的釉面横纹数，进而推算出牙冠的形成时间和年龄。与化石人科成员、现代人及现生大猿比较，禄丰古猿牙冠发育模式及时间，与南方古猿纤细种比较接近或相似，明显长于南方古猿粗壮种。

The enamel microstructure of 4 permanent teeth of Lufengpithecus lufengensis was observed with SEM.Perikymata were clearly shown on the entire crown surface,and the density of perikymata showed a gradual increase towards the cervix.Perikymata counts were 172 for I 1,151 for I 2,128 for I 1,161 for lower canine,and crown formation time was estimated respectively as 3 8,3 4,3 0 and 3 6 years based on a 7 days periodicity of perikymata. Compared with fossil hominids,modern humans and apes,crown formation time of Lufengpithecus lufengensis is nearer to that of Australopithecus afarensis and Australopithecus africanus, and longer than that of Australopithecus robustus and Australopithecus boisei .The pattern of compactness of perikymata is similar to that of modern humans,and different from that of apes.This study support the suggestion that Lufengpithecus lufengensis may be a member of the early hominid evolving to australopithecines.