Developmental constraint on the evolution of marsupial forelimb morphology

W. James Cooper; Scott J. Steppan

doi:10.1071/ZO09102

RESEARCH ARTICLE

Next Contents Vol 58(1)

Developmental constraint on the evolution of marsupial forelimb morphology

W. James Cooper ^A ^B ^C and Scott J. Steppan ^A

+ Author Affiliations

- Author Affiliations

^A Department of Biological Science, The Florida State University, Tallahassee, FL 32306-4295, USA.

^B Present address: Department of Biology, Syracuse University, 107 College Place, Life Sciences Complex, Syracuse, NY 13244, USA.

^C Corresponding author. Email: wjcooper@syr.edu

Australian Journal of Zoology 58(1) 1-15 https://doi.org/10.1071/ZO09102
Submitted: 7 October 2009 Accepted: 19 January 2010 Published: 7 April 2010

Abstract

Compared with the placental mammals, marsupials are born at an almost embryonic stage, but nearly all of these neonates immediately climb or crawl to one of their mother’s teats using precociously developed forelimbs. Marsupial adults also exhibit limited forelimb shape diversity relative to the members of their sister group. That the functional requirements of this natal climb have imposed a developmental constraint on marsupial forelimb evolution represents a compelling and widely accepted hypothesis, yet its resulting predictions for the comparative patterns of mammal limb shape diversity have never been tested. In order to perform such tests we conducted extensive taxonomic sampling of mammal limb morphology (including fossil specimens), and then examined these data using morphometric methods, non-parametric analyses of anatomical disparity, and phylogenetic comparative analyses of evolutionary rates. Our results strongly support the constraint hypothesis, and indicate that the highly significant differences between marsupial and placental forelimb shape diversity has been strongly influenced by different rates of morphological evolution among the distal forelimb elements in these two important mammal lineages.

Additional keywords: comparative method, developmental constraint, eutheria, forelimb, hindlimb, marsupial, metatheria, morphological evolution, morphometrics, placental mammal.

Acknowledgements

We thank Mike LaBarbera, Bill Parker, William Herrnkind, Mark Westneat, Barry Chernoff, Miriam Zelditch, Don Swiderski, Brian O’Meara, Craig Albertson and Geeta Sawh for valuable support and assistance. We also thank the staff of the following museums and universities for access to specimens: AMNH, FLIN, FLMNH, FMNH, MVZ, SAMA, and USNM. This work was supported by a grant from Sigma Xi and by the Department of Biological Science at The Florida State University.

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**Appendix 1. Taxonomic list of the species examined**
An asterisk denotes fossil specimens

**Appendix 2. Alphabetical list of specimens with museum identification numbers**
AMNH, American Museum of Natural History; FLIN, Flinders University; FLMNH, Florida Museum of Natural History; FMNH, Field Museum of Natural History; MVZ, Museum of Vertebrate Zoology, University of California, Berkeley; SAMA, South Australian Museum; USNM, United States National Museum of Natural History

**Appendix 3. Limb measurements collected**

Developmental constraint on the evolution of marsupial forelimb morphology

Abstract

Acknowledgements

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