Origin and Affinities of Craniofacial Features of Jomon and Ainu

在东亚，最有特色的异常值是日本的所罗门和阿伊努。阿伊努人与西北美洲原住民有着密切的关系。另一方面，所罗门与早期的东南亚人有相似的特征，另一方面与阿伊努人和一些美洲原住民有相似的特征。这些发现表明，从东南亚到日本群岛北部的较大范围内分布的史前种群的形态多样性可能并不是那么大。东南亚、东亚和东北亚的区域内差异是平行的。这表明这三个人口群体之间的关系根深蒂固。然而，考虑到遗传漂移，东南亚人和东亚/东北亚人是否是独立的系统发育单位还远不明显。

In East Asia, the most distinctive outliers are Jomon and Ainu in Japan. Ainu shows close affinities with Native northwest Americans. On the other hand, Jomon shares similar characteristics with Early Southeast Asians on the one hand, and Ainu as well as some Native Americans on the other hand. Such findings suggest that the morphological diversity of the prehistoric populations distributed in relatively vast region from Southeast Asia to northern part of Japanese Archipelago might not have been so large. The intraregional variation in Southeast Asia, East Asia, and Northeast Asia is parallel with each other. This indicates a deep rooting for the relationship among the three population groups. Genetic drift are taken into consideration, however, it is far from obvious whether the Southeast Asians and East/Northeast Asians are separate phylogenetic units.