In a new article in PLoS ONE, a group of researchers led by Kevin Edwards present a collection of images of Hawaiian Drosophila wings. Here's one figure from the paper showing the evolutionary relationships of a bunch of different clades and some representative wing patterns:
The authors point out that, with the availability of the Drosophila grimshawi genome sequence, biologists can now use molecular techniques to understand the genetic changes that give rise to the various pigmentation patterns.
Edwards KA, Doescher LT, Kaneshiro KY, Yamamoto D. 2007. A database of wing diversity in the Hawaiian Drosophila. PLoS ONE 2: e487 doi:10.1371/journal.pone.0000487
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Paraphyly in Drosophila
The Drosophila genus is paraphyletic. That means there are species nested within the phylogeny of the genus that belong to other genera.
Endangered Ugly Things has a post on the eleven Drosophila species listed as endangered and the one listed as threatened in 2006. These flies are known as picture winged for the patterns found on their wings.
Ah yes, the wonders of regulatory evolution.
Carroll and company just recently published a paper covering the general principles surrounding regulatory evolution:
http://www.pnas.org/cgi/reprint/0700488104v1
And it's free!