Advanced dental reduction in Javanese Homo erectus
Advanced dental reduction in Javanese Homo erectus
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DOI：
10.1537/ase.040729
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发表时间：
2006-04-01
影响因子：
0.7
通讯作者：
Kaifu, Yousuke
中科院分区：
文献类型：
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作者：
Kaifu, Yousuke
早更新世晚期爪哇桑吉兰直立人的后犬齿牙冠被认为比更古老的直立人明显更小。同一地区的直立人遗骸在这项研究中，前者的牙齿减少的程度进行了比较，他们的后犬齿冠的大小与各地区组的最近H。智人结果表明，爪哇PI的整体冠的大小和程度的后磨牙减少。早更新世晚期的直立人在现代H.智人这个H.本文讨论了早更新世至中更新世亚洲古人类牙齿减少的总趋势。系统发育不连续性假说的影响。erectus和H. sapiens在澳大拉西亚。与它们减小的树冠大小相反，爪哇H。直立人的遗骸显示出强壮的根系，可能是原始的保留。这一观察结果表明，在人属进化过程中，冠部尺寸的减少先于根部的减少，至少在巽他地区是这样。
The postcanine tooth crowns of late Early Pleistocene Homo erectors from Sangiran, Java, have been considered to be significantly smaller than those of older H. erectus remains of the same region. In this study, the degree of dental reduction in the former was examined by comparing their postcanine crown size with that of various regional groups of recent H. sapiens. The results show that overall crown size and degree of posterior molar reduction of Javanese PI. erectus of the late Early Pleistocene was within the range of variation of recent H. sapiens. The position of this H. erectus group in the general trend of dental reduction in Early to Middle Pleistocene Asian archaic Homo is discussed. Implications for the phylogenetic discontinuity hypothesis between H. erectus and H. sapiens in Australasia are presented. In contrast to their reduced crown size, the Javanese H. erectus remains exhibit robust root systems, presumably a primitive retention. This observation indicates that reduction in crown size preceded reduction of the roots during evolution of Homo, at least in the Sunda region.