Evolution of the obscura group drosophila species. II. Phylogeny of ten species based on electrophoretic data

Summary Nine palearctic and one North American Drosophila species of the obscura group have been compared with respect to electrophoretically detectable differences at 24 enzyme loci. The genetic distances between the species have been calculated. The constructed tree is divided into two evolutionary lineages. The first comprises the species D. pseudoobscura and D. helvetica and the second the palearctic species of the obscura subgroup. The latter splits into two lineages. One lineage leads to D. bifasciata and D. subsilvestris ; the other splits further to two sublineages: the sublineage of D. obscura, D. tristis and D. ambigua and the sublineage of D. guanche, D. subobscura and D. madeirensis .