Early Pleistocene third metacarpal from Kenya and the evolution of modern human-like hand morphology

Carol V. Ward; Matthew W. Tocheri; J. Michael PlavcanFrancis H. BrownFredrick Kyalo Manthi

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Early Pleistocene third metacarpal from Kenya and the evolution of modern human-like hand morphology

机译：Early Pleistocene third metacarpal from Kenya and the evolution of modern human-like hand morphology

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Despite discoveries of relatively complete hands from two early hominin species (Ardipithecus ramidus and Australopithecus sediba) and partial hands from another (Australopithecus afarensis), fundamental questions remain about the evolution of human-like hand anatomy and function. These questions are driven by the paucity of hand fossils in the hominin fossil record between 800,000 and 1.8 My old, a time interval well documented for the emergence and subsequent proliferation of Acheulian technology (shaped bifacial stone tools). Modern and Middle to Late Pleistocene humans share a suite of derived features in the thumb, wrist, and radial carpometacarpal joints that is noticeably absent in early hominins. Here we show that one of the most distinctive features of this suite in the Middle Pleistocene to recent human hand, the third metacarpal styloid process, was present ～1.42 Mya in an East African hominin from Kaitio, West Turkana, Kenya. This fossil thus provides the earliest unambiguous evidence for the evolution of a key shared derived characteristic of modern human and Neandertal hand morphology and suggests that the distinctive complex of radial carpometacarpal joint features in the human hand arose early in the evolution of the genus Homo and probably in Homo erectus sensu lato.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2014年第1期|121-124|共4页
作者
Carol V. Ward; Matthew W. Tocheri; J. Michael PlavcanFrancis H. BrownFredrick Kyalo Manthi;
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作者单位

Integrative Anatomy Program, Department of Pathology and Anatomical Sciences, University of Missouri, Columbia, MO 65212;

Human Origins Program, Department of Anthropology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560;

Department of Anthropology, University of Arkansas, Fayetteville, AR 72701Department of Geology and Geophysics, University of Utah, Salt Lake City, UT 84112Department of Earth Sciences, National Museums of Kenya, Nairobi, Kenya;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Pleistocene; metacarpal; morphology;

Early Pleistocene third metacarpal from Kenya and the evolution of modern human-like hand morphology

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