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总结
多家媒体报道，研究团队对乍得出土、约700万年前的撒赫人（Sahelanthropus）肢骨进行新一轮形态与受力分析，认为股骨等特征支持其具备双足直立行走能力，可能是迄今最早的人类谱系“祖先”候选。这将把人类关键特征出现时间进一步前推，但化石是否同属该物种、样本保存与测量方法等仍存争议，部分学者认为证据不足，需更多化石与独立复核验证。
正文
Fresh bone analysis makes case for earliest 'ancestor of humankind', but doubts remain The Guardian When did humanity take its first step? Scientists say they now know. The Washington Post Evidence of upright walking found in 7-million-year-old Sahelanthropus fossils Phys.org A new analysis reveals clues about when primates started walking on two feet NPR Controversial Ancestor Found to Have Done Something Eerily Human ScienceAlert
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