Top > African Study Monographs > ASM Supplementary Issue Back Number > No.24 (1996)
Study of the Tertiary Hominoids and Their Palaeoenvironments in East Africa: 6
Morphological Studieds of the Postcranium of Kenyapithecus Discovered form Nachola, Nothern Kenya

Edited by Hidemi ISHIDA and Masato NAKATSUKASA


pp. 1-2

PREFACE

Hidemi ISHIDA & Masato NAKATSUKASA

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pp. 3-56

Kenyapithecus Postcranial Specimens from Nachola, Kenya

Micael D. ROSE
Department of Anatomy, Cell Biology and Injury Sciences,
New Jersey Medical School, University of Medicine and Dentistry of New Jersey

Yoshihiko NAKANO
Department of Biological Anthropology, Faculty of Human Sciences, Osaka University
Hidemi ISHIDA
Laboratory of Physical Anthropology, Department of Zoology, Kyoto University

ABSTRACT
   Twenty nine post cranial specimens of a Kenyapithecus species, discovered at Nachola during the field seasons 1984 and 1986, are described in detail. The specimens come from baboon-sized animals, with a baboon-like degree of sexual dimorphism in size. This species of Kenyapithecus was a predominantly arboreal animal, utilizing a combination of pronograde quadrupedalism and orthograde climbing and clambering activities. Postcranially it most resembles Proconsul, but it is a slightly more drived hominoid.

Key Words: Hominoid; Kenya; Kenyapithecus; Miocene; Nachola; Postcranials.

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pp. 57-71

Three-Dimensional Morphology of the Sigmoid Notch of the Ulna in Kenyapithecus and Proconsul

Masato NAKATSUKASA
Laboratory of Physical Anthropology, Faculty of Science, Kyoto University
Daisuke SHIMIZU
Laboratory of Physical Anthropology, Faculty of Science, Kyoto University
Yoshihiko NAKANO
Department of Biological Anthropology, Faculty of Human Sciences, Osaka University
Hidemi ISHIDA
Laboratory of Physical Anthropology, Faculty of Science, Kyoto University

ABSTRACT
   The three-dimensional (3-D) morphology of the sigmoid notch was examined in Kenyapithecus, Proconsul, and several living anthropoids by using an automatic 3-D digitizer. It was revealed that Kenyapithecus and Proconsul exhibit a very similar morphology of the distal region of the sigmoid notch; including the absence of a median keel and a downward sloped coronoid process. In addition, the proximal region of the sigmoid notch is curved more acutely relative to the distal region in Proconsul. This morphorogical complex is unique and not found in the examined living primates. The benefits of 3-D morphometrics are discussed.

Key Words: Kenyapithecus; Proconsul; sigmoid notch; three-dimensional morphometris; ulna.

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