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Authors' addresses: 



Olaf R.P. Bininda-Emonds* and Anthony P. Russell Vertebrate Morphology Research 

 Group, Department of Biological Sciences, University of Calgary, Calgary, Alberta T2N 

 1N4, Canada 



E-mail: olaf.bininda@zoology.oxford.ac.uk 



arussell @ acs .ucalgary.ca 

 * Current address: Department of Zoology, University of Oxford, South Parks Road, 

 Oxford, OX1 3PS, United Kingdom 



