Published online by Cambridge University Press: 05 November 2012
Introduction
Evolution is a natural experiment that has been running for millions of years (Shubin 1991). Developmental biologists and palaeontologists can learn from this experiment (Zákány and Duboule 2007; see also chapters in this volume by Anthwal and Tucker; Buchholtz; Kuratani and Nagashima; Mitgutsch et al.; Schmid; Sears et al.; Smith and Johanson). A particular challenge is the homology of elements distal to the ulna and radius in modern birds. Developmental biologists differ on how many skeletal primordia actually develop in the embryonic wing bud, and the homologies of the permanent bones of the avian wrist are also uncertain.
Study of the avian wing is important for several reasons. First, the wing skeleton is an important issue in discussions about avian origins (Ostrom 1975; Müller 1991; Feduccia 2002; Prum 2002; Vargas and Fallon 2005b; Feduccia et al. 2007). Furthermore, the chicken is a key model species in developmental biology, and the development of its wing has been intensively studied in the context of pattern formation theory (Tickle 2004). Finally, the fact that the avian wing is studied by developmental biologists, palaeontologists, morphologists and others makes it a suitable subject of enquiry for the integrated discipline of evo devo (Galis et al. 2003).
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