Figure 14. | Homo naledi, a new species of the genus Homo from the Dinaledi Chamber, South Africa

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Homo naledi, a new species of the genus Homo from the Dinaledi Chamber, South Africa

Figure 14.

Affiliation details

University of the Witwatersrand, South Africa; University of Wisconsin-Madison, United States; Texas A&M University, United States; Duke University, United States; University of Zurich, Switzerland; University of Arkansas, United States; University of Kent, United Kingdom; Max Planck Institute for Evolutionary Anthropology, Germany; Mercyhurst University, United States; New York University, United States; New York Consortium in Evolutionary Primatology, United States; Dartmouth College, United States; University of Colorado Denver, United States; Loughborough University, United Kingdom; Tulane University, United States; Lehman College, United States; American Museum of Natural History, United States; University of Cape Town, South Africa; Museo Nacional de Ciencias Naturales, Spain; Modesto Junior College, United States; Louisiana State University, United States; Nazarbayev University, Kazakhstan; University of Missouri, United States; University of Kentucky College of Medicine, United States; Simon Fraser University, Canada; Université de Montréal, Canada; Australian National University, Australia; Biology Department, Universidad Autònoma de Madrid, Spain; Midwestern University, United States; Liverpool John Moores University, United Kingdom; University of Pisa, Italy; Chaffey College, United States; University of Johannesburg, South Africa; George Washington University, United States; University of Colorado School of Medicine, United States; Croatian Natural History Museum, Croatia; University of Iowa, United States; Lincoln Memorial University, United States; Smithsonian Institution, United States; Institute of Vertebrate Paleontology and Paleoanthropology, China
Figure 14.
Download figureOpen in new tabFigure 14. First metacarpals of H. naledi.

Seven first metacarpals have been recovered from the Dinaledi Chamber. U.W. 101-1321 is the right first metacarpal of the associated Hand 1 found in articulation. U.W. 101-1282 and U.W. 101-1641 are anatomically similar left and right first metacarpals, which we hypothesize as antimeres, both were recovered from excavation. U.W. 101-007 was collected from the surface of the chamber, and exhibits the same distinctive morphological characteristics as all the first metacarpals in the assemblage. All of these show a marked robusticity of the distal half of the bone, a very narrow, ‘waisted’ appearance to the proximal shaft and proximal articular surface, prominent crests for attachment of M. opponens pollicis and M. first dorsal interosseous, and a prominent ridge running down the palmar aspect of the bone. The heads of these metacarpals are dorsopalmarly flat and strongly asymmetric, with an enlarged palmar-radial protuberance. These distinctive features are present among all the first metacarpals in the Dinaledi collection, and are absent from any other hominin sample. Their derived nature is evident in comparison to apes and other early hominins, here illustrated with a chimpanzee first metacarpal and the MH2 first metacarpal of Australopithecus sediba.