Vreede, Barbara MILynch, Jeremy ARoth, SiegfriedSucena, Élio2015-11-112015-11-112013-03-01Vreede et al. : Co-option of a coordinate system defined by the EGFr and Dpp pathways in the evolution of a morphological nov- elty. EvoDevo 2013 4 :7.http://hdl.handle.net/10400.7/489Morphological innovation is an elusive and fascinating concept in evolutionary biology. A novel structure may open up an array of possibilities for adaptation, and thus is fundamental to the evolution of complex multicellular life. We use the respiratory appendages on the dorsal-anterior side of the Drosophila eggshell as a model system for morphological novelty. To study the co-option of genetic pathways in the evolution of this novelty we have compared oogenesis and eggshell patterning in Drosophila melanogaster with Ceratitis capitata, a dipteran whose eggs do not bear dorsal appendages.engEvolutionary noveltyDrosophila melanogasterCeratitis capitataOogenesisPattern formationDorsal appendagesGenetic networkjournal article10.1186/2041-9139-4-7