Evolutionary Biology

, Volume 39, Issue 4, pp 447–455 | Cite as

The Developmental Origins of Mosaic Evolution in the Primate Limb Skeleton

Synthesis Paper

Abstract

The central hypothesis of this paper is that basic properties of vertebrate limb development bias the generation of phenotypic variation in certain directions, and that these biases establish focal units, or regions, of evolutionary change within the primate hand and foot. These focal units include (1) a preaxial domain (digit I, hallux or pollex, metapodial and proximal phalanx), (2) a postaxial domain (metapodials and phalanges of digits II–V), and (3) a digit tip domain (terminal phalanges and nails/claws of rays I–V). The existence of these focal units therefore provides a mechanistic basis for mosaic evolution within the hand and foot, and can be applied to make specific predictions about which features of the limb skeleton are most likely to be altered in primate adaptive radiations over time. Examination of the early primate fossil record provides support for this model, and suggests that the existence of variational tendencies in limb development has played a major role in guiding the origin and evolution of primate skeletal form.

Keywords

Evolvability Autopod Digits Euprimates Euarchonta 

Notes

Acknowledgments

I am grateful to Drs. Philipp Gunz and Philipp Mitteröcker for inviting me to participate in the Symposium on Human Evolution and Development held at the Konrad Lorenz Institute in Altenberg, Austria. Prof. Dr. Gerd Müller, Eva Karner, and Astrid Juette provided wonderful hospitality during the visit. Drs. Jukka Jernvall, Frietson Galis, and Benedikt Hallgrimmson provided helpful discussions on aspects of limb evolution and development.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Cellular Biology and AnatomyGeorgia Health Sciences UniversityAugustaUSA
  2. 2.Institute of Molecular Medicine and GeneticsGeorgia Health Sciences UniversityAugustaUSA
  3. 3.Department of Orthopaedic SurgeryGeorgia Health Sciences UniversityAugustaUSA

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