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The origin and diversification of an evolutionary novelty: lessons from Drosophila oogenesis
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In any area of study, it is necessary to define the subject of investigation. In the
case of evolutionary novelty this is a particularly difficult task, as a clear definition
of the concept that is suitable across di↵erent levels of biological organization has
yet to emerge. We proceed with a definition for morphological novelty proposed
by M¨uller and Wagner (1991), and introduce the dorsal appendages on eggs of
Drosophilidae as such a novelty. These structures are part of the eggshell, and help
supply oxygen to the embryo. A wide variety of phenotypes can be found, which
is thought to have a single origin in the common ancestor of Drosophilidae.(...)