HOPE Report No.23, 8th, December 2004.
Program No.23 (Joint research)
Masato Nakatsukasa Graduate School of Science, Kyoto University, Associate Professor
Place of visit: Natural History Museum, Berlin, Germany
and Anthropological Museum, Zurich University, Zurich, Switzerland
Term of trip: From Nov. 14, 2004 to Dec. 5, 2004.11.24
Evolution of primate axial skeleton
Currently known Miocene hominoids from East Africa exhibit a relatively
small lumbar vertebral articular surface when it is scaled on their presumed body mass. To explain this phenomenon, scaling relationships
between body mass, lumbar segmental length, and lumbar vertebral body surface area were investigated in living primate taxa (hominoids,
Cercopithecidae, Ceboidea, Lemuriformes, Galaginae, and Lorisinae).
Tentative results are as follows. Cercopithecids have a large lumbar surface area relative to the body mass compared to platyrrhines (up-shift).
However, this up-shift is cancelled when the lumbar vertebral surface area
is scaled on the body mass and lumbar segmental length. Among prosimians,
Lemuriformes, Galaginae, and Lorisinae exhibit a same scaling trend about the lumbar vertebral surface area relative to the body mass as well as to
the product of the body mass and lumbar segmental length.
Humboldt University, Berlin
Beside the Limmat river, Zurich