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The tibio-fibular articulation in Apidium phiomense, an Oligocene anthropoid

Naturevolume 301pages238239 (1983) | Download Citation



Apidium phiomense, a primitive anthropoid from the Oligocene of Egypt, shows partial fusion of the distal tibio-fibular articulation with extensive apposition of the two bones, a unique condition among higher primates. Functionally, this condition restricts the tibio-talar Joint to simple hinge movements which, together with other features in the skeletal anatomy of A. phiomense, suggests that this species was a leaper. The condition in Apidium suggests phenetic and possible phylogenetic links with platyrrhine monkeys, many of which show similar, but less extensive fibular apposition.

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  1. Department of Anatomical Sciences, Health Sciences Center, State University of New York, Stony Brook, New York, 11794, USA

    • John G. Fleagle
  2. Duke University Center for the Study of Primate Biology and History, 3705 Erwin Road, Durham, North Carolina, 27705, USA

    • Elwyn L. Simons


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