Abstract
Geographical distribution of some sibling species of Drosophila was explained by the direction of evolution based on the mating preferences and White′s stasipatric speciation. The D. bipectinata complex and the D. takahashii complex distributed in the Oriental-Australian biogeographic zones are good examples for the speciation model in which the sibling species repeatedly evolved in the center near Borneo and expanded radially, eliminating the old species.
