Abstract
The Hawaiian picture-winged Drosophila are a well characterized group among which there are marked differences in the pattern of expression of several developmentally regulated enzymes. We have assessed the phylogenetic information content of these pattern differences by using them in the PAUP computer program (Swofford, 1984). The resulting phylogenies were examined for internal consistency and compared to phylogenies based on other character sets. The results suggest that these patterns have changed so extensively that relationships between distantly related species have been obscured. However, the amount of homoplasy within groups of closely related species is sufficiently small that regulatory patterns may be useful for inferring relationships at this level, especially between chromosomally homo- sequential species. (Phylogeny; relationships; Drosophila; PAUP program.)
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