New four-million-year-old hominid species from Kanapoi and Allia Bay, Kenya
New four-million-year-old hominid species from Kanapoi and Allia Bay, Kenya
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来自肯尼亚卡纳波伊和阿利亚湾的新人类物种，已有四百万年历史
作者：
M. Leakey;C. Feibel;I. Mcdougall;A. Walker
这里描述了来自肯尼亚卡纳波伊的 9 个原始人类牙齿、颅骨和颅后标本，以及来自肯尼亚阿利亚湾的 12 个标本，它们是一种南方古猿新物种，其年代可追溯到约 390 万至 420 万年前。原始特征和衍生特征的镶嵌表明该物种可能是南方古猿阿法种的祖先，并表明地猿是该物种和所有后来的原始人类的姐妹物种。胫骨证实原始人类至少在先前最早的证据显示之前五十万年就已经是双足动物了。
Nine hominid dental, cranial and postcranial specimens from Kanapoi, Kenya, and 12 specimens from Allia Bay, Kenya, are described here as a new species of Australopithecus dating from between about 3.9 million and 4.2 million years ago. The mosaic of primitive and derived features shows this species to be a possible ancestor to Australopithecus afarensis and suggests that Ardipithecus ramidus is a sister species to this and all later hominids. A tibia establishes that hominids were bipedal at least half a million years before the previous earliest evidence showed.